Atlas Copco Elektronikon Alarm Codes (Compressors, VSD)

How alarms show

Shutdown: the machine stops, the shutdown message shows on the display and the general alarm LED flashes. Shutdown warning: a message appears and the general alarm LED lights while the machine keeps running; the message clears once the reading is back below the warning level. Service warning: a message shows on the display and the service LED lights.

On the Elektronikon Graphic (Mk5), open Menu, then Inputs: any input in warning or shutdown shows a warning or stop icon instead of its normal icon. Move to the Stop or Protections icon and press Enter to see the active protection, for example Main motor converter alarm with its fault code. The Event history menu lists the last shutdowns and emergency stops.

On the Mk5s Touch, the warning sign flashes for a shutdown and stays lit for a warning, and the service sign lights when service is due. To reset: fix the cause first, make the machine safe for any physical check, reset at the controller (and reset a tripped device such as the main motor overload relay at the device, if your procedures allow), then restart and watch the reading.

Reset service warnings in the Service menu only after the work is done. If an alarm returns right after a reset, stop resetting and call Atlas Copco service with the message text and serial number.

Safety first.

Before opening any panel, stop the machine at the controller, isolate and lock off the electrical supply, and release all pressure (or vent a vacuum pump). A machine on a warning is still running and can load again without notice. Work inside the electrical cubicle or the VSD converter is for qualified people only.

On machines fed by a frequency converter, wait 10 minutes after switching off before electrical work, because the capacitors keep a dangerous voltage. Do not trust indicator lamps: check with a meter that the circuit is dead.

Automatic restart after voltage failure, week timers and remote control can start the machine without warning, even after a manual stop, so lock out the isolator and hang a do not start sign. Let the machine cool before maintenance; pipes and parts can be hotter than 70 °C (158 °F). (Atlas Copco Elektronikon alarm guide and troubleshooting guide.

GHS VSD+ instruction manual 6996022310_C, chapter 1. Start and control system instruction book 6996 0242 10, chapters 1 and 7.) Follow lockout/tagout and your site's safe-work procedures, and check the manual for your exact model before you act.

Quick lookup

Shutdowns stop the compressor and every line that runs on its air, so in OEE they are availability losses; warnings are early signs.

Type an alarm or a word (temperature, overload, voltage, service) to filter the list. Click a row for its causes and first checks. Applies to tells which machines Atlas Copco documents it for: the converter codes come from the VSD+ vacuum pump and VSD cabinet books, and Atlas Copco says message texts vary by series, controller and options.

Find a code or a word

53 codes

Alarm or code	Applies to	What it means
Compressor element outlet temperature high	Air compressors	The air leaving the screw element is hotter than the programmed limit.
Drive motor overload	Air compressors	The main motor protection has tripped and the compressor stops, or will not start, to protect the main motor.
Fan motor overload	Air compressors	The cooling fan motor protection has tripped.
Main motor converter alarm (VSD models)	Air compressors	On a variable speed drive (VSD) compressor, the frequency converter has reported a fault to the Elektronikon.
Shutdown warning	Air compressors	A measurement has passed its programmed shutdown warning level, which sits below the shutdown level.
General shutdown	Air compressors	A critical condition has made the controller stop the compressor to prevent damage.
Sensor failure	Air compressors	A critical sensor signal is missing or invalid.
Under or over voltage, phase loss, phase reversal	Air compressors	The power supply to the machine has a problem: voltage too low or too high, a missing phase, or the phases connected in the wrong sequence.
High dew point warning	Air compressors	On compressors with an integrated dryer, the pressure dew point is higher than it should be, so the air is wetter than specified.
Service warning	Air compressors	A maintenance interval has been reached.
General warning	Air compressors	An operating value has left its normal range and reached a warning limit, but the compressor can keep running.
Permissive start	Air compressors	A warning message is shown before starting and the compressor will not start until that message is cleared.
Element outlet temperature is too high	GHS VSD+ vacuum pumps	The element outlet temperature has passed the shutdown warning level.
Pump element outlet temperature	GHS VSD+ vacuum pumps	The element outlet temperature has reached the shutdown level (factory setting 120 °C, 248 °F on these pumps), so the controller stops the machine, shows the fault and flashes the general alarm LED. Atlas Copco recommends a 10 °C (18 °F) gap between the warning and shutdown levels.
Pump discharge pressure is too high	GHS VSD+ vacuum pumps	The pressure on the discharge side of the pump (in the oil separator vessel) has passed its warning level.
Service plan (Level A, Level B, ...)	GHS VSD+ vacuum pumps	Service work is grouped into levels A, B and so on.
Fault code 2 (or 60000)	VSD cabinet, GHS 350 to 900 VSD+	The DC bus voltage in the converter has dropped too low.
Fault code 3 (or 60000)	VSD cabinet, GHS 350 to 900 VSD+	The converter's control power supply voltage is faulty.
Fault code 4 (or 60000)	VSD cabinet, GHS 350 to 900 VSD+	A third undervoltage condition detected by the converter.
Fault code 5	VSD cabinet, GHS 350 to 900 VSD+	The converter has seen a short circuit on its output or an IGBT fault.
Fault code 6	VSD cabinet, GHS 350 to 900 VSD+	The converter has detected a ground (earth) fault on the output side.
Fault code 7	VSD cabinet, GHS 350 to 900 VSD+	The converter output current went over its trip level.
Fault code 8	VSD cabinet, GHS 350 to 900 VSD+	The converter is getting too hot.
Fault code 9	VSD cabinet, GHS 350 to 900 VSD+	The converter heatsink temperature is too high.
Fault code 10	VSD cabinet, GHS 350 to 900 VSD+	The converter has passed its first overheat level.
Fault code 11	VSD cabinet, GHS 350 to 900 VSD+	The converter's motor overload protection has tripped.
Fault code 12	VSD cabinet, GHS 350 to 900 VSD+	The converter itself is overloaded.
Fault code 13	VSD cabinet, GHS 350 to 900 VSD+	The motor torque went above the converter's overtorque level.
Fault code 23	VSD cabinet, GHS 350 to 900 VSD+	The converter's internal cooling fan has a fault.
Fault code 27	VSD cabinet, GHS 350 to 900 VSD+	The converter has lost one of its input supply phases.
Fault code 28	VSD cabinet, GHS 350 to 900 VSD+	One of the output phases to the motor is missing.
Fault code 29	VSD cabinet, GHS 350 to 900 VSD+	The motor PTC thermistor reports the motor is too hot.
Fault code 31	VSD cabinet, GHS 350 to 900 VSD+	The converter could not write to its EEPROM memory.
Fault code 33	VSD cabinet, GHS 350 to 900 VSD+	Communication between the controller and the converter over Modbus has failed.
Fault code 54	VSD cabinet, GHS 350 to 900 VSD+	The current in the three output phases to the motor is unbalanced.
Fault code 59	VSD cabinet, GHS 350 to 900 VSD+	The converter's Safe Torque Off input is active, so the motor cannot make torque.
Neos code 0x1111 (4369)	GHS 1300 to 1900 VSD+	The Neos converter sees too low a supply voltage.
Neos code 0x2312 (8978), 0x2314 (8980)	GHS 1300 to 1900 VSD+	Overcurrent detected on the motor side of the converter.
Neos code 0x2315 to 0x2317 (8981 to 8983)	GHS 1300 to 1900 VSD+	A short circuit was detected in motor phase U (0x2315), V (0x2316) or W (0x2317).
Neos code 0x3210 (8976)	GHS 1300 to 1900 VSD+	Over voltage detected by the converter.
Neos code 0x3221 (12817)	GHS 1300 to 1900 VSD+	The main power supply voltage is too low.
Neos code 0x3223 (12835)	GHS 1300 to 1900 VSD+	The converter has detected a lost supply phase.
Neos code 0x3224 (12836)	GHS 1300 to 1900 VSD+	The DC link voltage has passed its maximum.
Neos code 0x3226 to 0x3228 (12838 to 12840)	GHS 1300 to 1900 VSD+	Over voltage or over temperature detected in the IGBT of phase U (0x3226), V (0x3227) or W (0x3228).
Neos code 0x4311 (17169)	GHS 1300 to 1900 VSD+	Over temperature detected in an IGBT of the converter.
Neos code 0x4312 (17170)	GHS 1300 to 1900 VSD+	Over temperature detected in the converter heatsink.
Neos code 0x5020 to 0x5022 (20512 to 20514)	GHS 1300 to 1900 VSD+	The emergency stop circuit is open, so the converter's Safe Torque Off is active.
Neos code 0x5114, 0x5115 (20756, 20757)	GHS 1300 to 1900 VSD+	The converter's internal power supply has tripped.
Neos code 0x610C (24844)	GHS 1300 to 1900 VSD+	The CAN link between the Elektronikon and the converter timed out.
Neos code 0x7130 (28976)	GHS 1300 to 1900 VSD+	The converter has detected that the motor is too hot.
Neos code 0x8401 (33793)	GHS 1300 to 1900 VSD+	The motor went faster than its maximum speed.
Neos code 0x8402 (33794)	GHS 1300 to 1900 VSD+	The motor did not reach the requested speed during start-up.
Neos code 0x9001 (36865)	GHS 1300 to 1900 VSD+	The converter's hardware enable signal is missing, so it will not run.

Each code: causes and first checks

Compressor element outlet temperature high

Hits OEE: Availability

What it means: The air leaving the screw element is hotter than the programmed limit. The controller first gives a shutdown warning, and if the temperature keeps rising to the shutdown level it stops the compressor. Atlas Copco calls this one of the most common faults on rotary screw compressors.^[1]^[2]^[3]

Also on: Applies to: Elektronikon (all generations), Atlas Copco air compressors.

Machine response: Shutdown warning first, then the compressor stops at the shutdown level

Likely causes

Dirty coolers or heat exchangers
Blocked ventilation, too little cooling air, or hot cooling air recirculating
High ambient temperature in the compressor room
Cooling fan not working
Oil level too low or oil in poor condition
Oil cooler clogged or bypass valve not working
On water-cooled units: cooling water too warm, flow too low, or dirt and scale in the water circuit

First checks, in this order

Clean the coolers and heat exchangers.
Check that the cooling fan runs.
Check the ventilation around the compressor and stop cooling air from recirculating.
Check the oil level and oil condition.
On water-cooled units, check water flow and temperature and clean the water circuit and coolers.
If it keeps coming back, look at the cooling installation and the compressor room first.
Call Atlas Copco service if it repeats, or if the oil cooler is clogged.

Drive motor overload: Elektronikon shows motor overload problem

Hits OEE: Availability

What it means: The main motor protection has tripped and the compressor stops, or will not start, to protect the main motor.^[1]^[2]^[3]

Also on: Applies to: Elektronikon (all generations), Atlas Copco air compressors.

Machine response: Compressor stops or will not start

Likely causes

Main motor overload relay (F21) open
Motor thermistor (K34) tripped or defective
Too much load on the compressor
Unbalanced electrical supply
Problem in the supply cables, connections or terminals
Wiring interrupted

First checks, in this order

Reset the overload relay once, if your operating procedures allow it. If it trips again, call Atlas Copco.
Check the incoming supply voltage and voltage balance.
Measure the compressor current and check it is within limits.
Check the motor protection settings.
Check the electrical connections and terminals.

Fan motor overload

Hits OEE: Availability

What it means: The cooling fan motor protection has tripped. Atlas Copco lists the fan circuit breaker and fan overload among the causes when the compressor will not start or stops with a motor overload message.^[1]^[2]

Also on: Applies to: Elektronikon (all generations), Atlas Copco air compressors.

Machine response: Compressor stops or will not start

Likely causes

Cooling fan failure
Circuit breaker (Q15) or fan motor overload (F15) open
Electrical fault in the fan circuit
Something blocking the fan
Fan motor overloaded

First checks, in this order

Inspect the cooling fan assembly.
Remove anything blocking the fan or the air flow.
Check the electrical connections.
Check the motor protection devices and reset the overload once. If it trips again, call Atlas Copco.

Main motor converter alarm (VSD models): Main motor converter alarm

Hits OEE: Availability

What it means: On a variable speed drive (VSD) compressor, the frequency converter has reported a fault to the Elektronikon. The converter keeps its own fault code, which is separate from the Elektronikon message.^[1]

Also on: Applies to: Elektronikon (all generations), Atlas Copco air compressors. The same message, with a numeric converter fault code, is documented for Elektronikon Graphic (Mk5) VSD vacuum pumps (see the converter code rows)

Machine response: Compressor stops

Likely causes

Converter overheating
Electrical disturbances on the supply
Internal converter fault
Machine running outside its design conditions

First checks, in this order

Check the cooling air flow and the operating temperatures.
Check that the supply voltage is stable and within limits.
Write down the fault code the converter shows so you can give it to Atlas Copco service.
Call Atlas Copco service if the alarm stays or comes back.

Shutdown warning

Warning: act before it becomes a stop

What it means: A measurement has passed its programmed shutdown warning level, which sits below the shutdown level. A message appears and the general warning LED lights so the operator can act before the shutdown level is reached. The compressor keeps running.^[1]

Also on: Applies to: Elektronikon (all generations), Atlas Copco air compressors.

Machine response: Compressor keeps running

Likely causes

A reading (for example element outlet temperature) is rising toward its shutdown limit
The underlying problem behind that reading has not been fixed

First checks, in this order

Read the message to see which measurement is in warning.
Find and fix the cause now, before the reading reaches the shutdown level.
Remember the compressor is still running and can reload without notice.

General shutdown

Hits OEE: Availability

What it means: A critical condition has made the controller stop the compressor to prevent damage. Examples Atlas Copco gives are severe overheating, main motor overload, critical drive faults and serious sensor failures.^[1]

Also on: Applies to: Elektronikon (all generations), Atlas Copco air compressors.

Machine response: Compressor stops, reset after the cause is fixed

Likely causes

Severe overheating
Main motor overload
Critical drive (converter) fault
Serious sensor failure

First checks, in this order

Read the exact shutdown message and write it down.
Fix the cause first.
Make the machine safe before any physical check: stop it, lock off the supply and depressurize.
Reset at the controller, restart and watch the reading that caused the alarm.
If it comes back right after the reset, stop resetting and call Atlas Copco service with the message text and the serial number.

Sensor failure

Hits OEE: Availability

What it means: A critical sensor signal is missing or invalid. A serious sensor failure stops the compressor; a non-critical sensor deviation only gives a warning.^[1]

Also on: Applies to: Elektronikon (all generations), Atlas Copco air compressors.

Machine response: Shutdown for a critical sensor, warning for a non-critical one

Likely causes

Defective temperature sensor
Pressure sensor malfunction
Damaged wiring
Failed connector

First checks, in this order

Inspect the sensor wiring and connectors.
Check the sensor readings on the Elektronikon.
Replace a faulty sensor if needed.
Call service for deeper diagnostics.

Under or over voltage, phase loss, phase reversal

Hits OEE: Availability

What it means: The power supply to the machine has a problem: voltage too low or too high, a missing phase, or the phases connected in the wrong sequence. An open phase sequence relay keeps the compressor from starting or stops it.^[1]^[2]

Also on: Applies to: Elektronikon (all generations), Atlas Copco air compressors.

Machine response: Compressor will not start or stops

Likely causes

Supply voltage out of range
A missing phase
Wrong phase sequence at the power inlet (phase sequence relay K25 open)

First checks, in this order

Check the supply voltage and voltage balance at the machine.
Check the phase sequence on the power inlet of the machine and correct it if needed.
Check power supply quality before replacing parts.

High dew point warning

Warning: act before it becomes a stop

What it means: On compressors with an integrated dryer, the pressure dew point is higher than it should be, so the air is wetter than specified. The compressor keeps running.^[1]^[2]^[3]

Also on: Applies to: Elektronikon (all generations), Atlas Copco air compressors.

Machine response: Compressor keeps running

Likely causes

Refrigerant circuit problem or shortage of refrigerant
Dryer malfunction
High moisture load or dryer capacity exceeded
Dirty condenser
Air inlet or ambient temperature too high
Air inlet pressure too low
Refrigerant compressor not running
Condenser pressure too high (fan or fan motor)

First checks, in this order

Check that the dryer is working.
Clean the condenser with a little dry compressed air, blown against the cooling air flow.
Check air inlet and ambient temperatures.
Check the electric supply to the refrigerant compressor.
Check the condenser fan and fan motor.
Check the dryer maintenance records.
Have Atlas Copco check the refrigerant circuit for leaks if needed.

Service warning

Warning: act before it becomes a stop

What it means: A maintenance interval has been reached. The Elektronikon counts operating hours and service intervals, and the warning means filter replacement, separator replacement (where a sensor is fitted) or scheduled preventive maintenance is due.^[1]

Also on: Applies to: Elektronikon (all generations), Atlas Copco air compressors.

Machine response: Compressor keeps running

Likely causes

Air filter or oil filter replacement due
Oil separator replacement due (machines with a dedicated sensor)
Scheduled preventive maintenance interval reached

First checks, in this order

Do the maintenance that is due.
Reset the service reminder only after the work is done, so the next interval counts from the right point.

General warning

Warning: act before it becomes a stop

What it means: An operating value has left its normal range and reached a warning limit, but the compressor can keep running. Examples are elevated temperatures, high dew point and non-critical sensor deviations.^[1]

Also on: Applies to: Elektronikon (all generations), Atlas Copco air compressors.

Machine response: Compressor keeps running

Likely causes

Elevated temperature
High dew point
Non-critical sensor deviation

First checks, in this order

Read the message and check the reading that is in warning.
Fix the cause before it turns into a shutdown.

Permissive start: Start withheld

Warning: act before it becomes a stop

What it means: A warning message is shown before starting and the compressor will not start until that message is cleared.^[1]

Also on: Applies to: Elektronikon (all generations), Atlas Copco air compressors.

Machine response: Compressor will not start until the message is cleared

Likely causes

A start condition is not met and the controller is holding the start

First checks, in this order

Read the message on the display.
Clear the condition it names, then start again.

Element outlet temperature is too high: Element outlet temperature (shutdown warning)

Warning: act before it becomes a stop

What it means: The element outlet temperature has passed the shutdown warning level. On these GHS VSD+ pumps the factory warning level is 112 °C (234 °F) and the shutdown level is 120 °C (248 °F). The message clears when the temperature drops.^[5]^[6]

Also on: Applies to: Elektronikon Graphic (Mk5), Atlas Copco GHS VSD+ oil-sealed screw vacuum pumps.

Machine response: Machine keeps running

Likely causes

Oil level too low
Not enough cooling air, cooling air too warm, or humidity too high
Oil cooler clogged
Oil filter clogged
Scavenge line clogged
Bypass valve not working
Degraded oil
Process air too hot
Element out of order

First checks, in this order

Check and top up the oil.
Check for cooling air restriction and improve room ventilation; stop cooling air from recirculating.
Clean the oil cooler.
Replace the oil filter.
Clean the scavenge line.
Test the bypass valve.
Check the service intervals for the oil.
Check the process air temperature.
Call Atlas Copco if the element is suspected.

Pump element outlet temperature: Element outlet temperature (shutdown)

Hits OEE: Availability

What it means: The element outlet temperature has reached the shutdown level (factory setting 120 °C, 248 °F on these pumps), so the controller stops the machine, shows the fault and flashes the general alarm LED. Atlas Copco recommends a 10 °C (18 °F) gap between the warning and shutdown levels.^[5]^[6]

Also on: Applies to: Elektronikon Graphic (Mk5), Atlas Copco GHS VSD+ oil-sealed screw vacuum pumps.

Machine response: Machine stops, reset after the cause is fixed

Likely causes

Same causes as the element outlet temperature warning: low oil, poor cooling, clogged oil cooler, oil filter or scavenge line, faulty bypass valve, degraded oil, hot process air

First checks, in this order

Let the machine cool before working on it.
Work through the element outlet temperature checks: oil level, cooling air, oil cooler, oil filter, scavenge line, bypass valve, oil condition.
Correct the fault, then reset the message. See the Inputs menu.
The setting can be lowered to 50 °C (122 °F) only to test the sensor; set it back after the test.

Pump discharge pressure is too high: Pump discharge pressure too high (shutdown warning)

Warning: act before it becomes a stop

What it means: The pressure on the discharge side of the pump (in the oil separator vessel) has passed its warning level. The machine keeps running.^[5]^[6]

Also on: Applies to: Elektronikon Graphic (Mk5), Atlas Copco GHS VSD+ oil-sealed screw vacuum pumps.

Machine response: Machine keeps running

Likely causes

Oil separator elements clogged
Oil filter clogged
Discharge outlet clogged
Bypass valve or oil injection system clogged

First checks, in this order

Replace the oil separator elements if they are clogged.
Replace the oil filter.
Check the couplings and the outlet.
Clean or replace the bypass valve.

Service plan (Level A, Level B, ...): Service warning, service plan level

Warning: act before it becomes a stop

What it means: Service work is grouped into levels A, B and so on. Each level has a running hours interval and a real time hours interval, and the warning appears at whichever comes first (example: level A at 4000 running hours or 8760 hours, one year). The real time counter keeps counting even when the controller is unpowered.^[4]^[5]^[6]

Also on: Applies to: Elektronikon Graphic (Mk5), Atlas Copco GHS VSD+ oil-sealed screw vacuum pumps.

Machine response: Machine keeps running

Likely causes

Running hours interval of a service level reached
Real time hours interval of a service level reached

First checks, in this order

Carry out the service actions for the level shown.
Then open Menu, Service, Service plan and reset the timer for that level.
Use Next service to see what is due next and History to see past services.
Intervals can be changed for medium or harsh duty, but must not exceed the nominal intervals; ask Atlas Copco before changing them.

Fault code 2 (or 60000): Main motor converter alarm

Hits OEE: Availability

What it means: The DC bus voltage in the converter has dropped too low.^[4]^[6]

Also on: Applies to: Elektronikon Graphic (Mk5) with VSD converter, Atlas Copco VSD start and control cabinet and GHS 350 to 900 VSD+ vacuum pumps. Same code and text in GHS 350 to 900 VSD+ instruction manual 6996022740_E

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Low or unstable supply voltage
Input wiring problem
EMC filter problem

First checks, in this order

Check the supply voltage.
Check the input wiring.
Check the EMC filter.

Fault code 3 (or 60000): Main motor converter alarm

Hits OEE: Availability

What it means: The converter's control power supply voltage is faulty.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Low or unstable supply voltage
Input wiring problem
EMC filter problem

First checks, in this order

Check the supply voltage.
Check the input wiring.
Check the EMC filter.

Fault code 4 (or 60000): Main motor converter alarm

Hits OEE: Availability

What it means: A third undervoltage condition detected by the converter.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Low or unstable supply voltage
Input wiring problem
EMC filter problem

First checks, in this order

Check the supply voltage.
Check the input wiring.
Check the EMC filter.

Fault code 5: Main motor converter alarm

Hits OEE: Availability

What it means: The converter has seen a short circuit on its output or an IGBT fault.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Short circuit in the motor wiring or motor
Mechanical load problem: inlet valve, separator back pressure or oil injection

First checks, in this order

Check the wiring to the motor.
Check for short circuits.
Check the inlet valve.
Check the back pressure in the oil separator vessel.
Check the oil injection.

Fault code 6: Main motor converter alarm

Hits OEE: Availability

What it means: The converter has detected a ground (earth) fault on the output side.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Ground fault in the motor or motor wiring
Mechanical load problem: inlet valve, separator back pressure or oil injection

First checks, in this order

Check the wiring to the motor.
Check for short circuits.
Check the inlet valve.
Check the back pressure in the oil separator vessel.
Check the oil injection.

Fault code 7: Main motor converter alarm

Hits OEE: Availability

What it means: The converter output current went over its trip level.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Motor wiring fault or short circuit
Too much mechanical load: inlet valve, separator back pressure or oil injection

First checks, in this order

Check the wiring to the motor.
Check for short circuits.
Check the inlet valve.
Check the back pressure in the oil separator vessel.
Check the oil injection.

Fault code 8: Main motor converter alarm

Hits OEE: Availability

What it means: The converter is getting too hot. Atlas Copco lists it in the converter fault table shown with the Main motor converter alarm.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

High ambient temperature
Poor converter cooling
Dirty or blocked heatsink

First checks, in this order

Check the ambient temperature.
Check the cooling of the converter.
Check the converter heatsink.

Fault code 9: Main motor converter alarm

Hits OEE: Availability

What it means: The converter heatsink temperature is too high.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

High ambient temperature
Poor converter cooling
Dirty or blocked heatsink

First checks, in this order

Check the ambient temperature.
Check the cooling of the converter.
Check the converter heatsink.

Fault code 10: Main motor converter alarm

Hits OEE: Availability

What it means: The converter has passed its first overheat level.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

High ambient temperature
Poor converter cooling
Dirty or blocked heatsink

First checks, in this order

Check the ambient temperature.
Check the cooling of the converter.
Check the converter heatsink.

Fault code 11: Main motor converter alarm

Hits OEE: Availability

What it means: The converter's motor overload protection has tripped.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Inlet valve problem
High back pressure in the oil separator vessel
Drive train problem
Oil injection problem

First checks, in this order

Check the inlet valve.
Check the back pressure in the oil separator vessel.
Check the drive train.
Check the oil injection.

Fault code 12: Main motor converter alarm

Hits OEE: Availability

What it means: The converter itself is overloaded.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Inlet valve problem
High back pressure in the oil separator vessel
Drive train problem
Oil injection problem

First checks, in this order

Check the inlet valve.
Check the back pressure in the oil separator vessel.
Check the drive train.
Check the oil injection.

Fault code 13: Main motor converter alarm

Hits OEE: Availability

What it means: The motor torque went above the converter's overtorque level.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Inlet valve problem
High back pressure in the oil separator vessel
Drive train problem
Oil injection problem

First checks, in this order

Check the inlet valve.
Check the back pressure in the oil separator vessel.
Check the drive train.
Check the oil injection.

Fault code 23: Main motor converter alarm

Hits OEE: Availability

What it means: The converter's internal cooling fan has a fault.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Converter cooling fan failed or blocked

First checks, in this order

Check the cooling of the converter, including its fan.

Fault code 27: Main motor converter alarm

Hits OEE: Availability

What it means: The converter has lost one of its input supply phases.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Missing supply phase or blown fuse
Input wiring fault
EMC filter problem

First checks, in this order

Check the supply voltage.
Check the input wiring.
Check the EMC filter.

Fault code 28: Main motor converter alarm

Hits OEE: Availability

What it means: One of the output phases to the motor is missing.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Loose or broken motor wiring

First checks, in this order

Check the wiring to the motor.

Fault code 29: Main motor converter alarm

Hits OEE: Availability

What it means: The motor PTC thermistor reports the motor is too hot.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Motor wiring or thermistor wiring problem
High ambient temperature
Poor motor cooling
Too much load: inlet valve or separator back pressure

First checks, in this order

Check the wiring to the motor.
Check the ambient temperature.
Check the cooling unit.
Check the inlet valve.
Check the back pressure in the oil separator vessel.

Fault code 31: Main motor converter alarm

Hits OEE: Availability

What it means: The converter could not write to its EEPROM memory. The Atlas Copco books use this code as their example of a Main motor converter alarm screen.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Internal converter memory fault

First checks, in this order

Contact Atlas Copco.

Fault code 33: Main motor converter alarm

Hits OEE: Availability

What it means: Communication between the controller and the converter over Modbus has failed.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Loose or damaged communication wiring

First checks, in this order

Check the communication wiring.

Fault code 54: Main motor converter alarm

Hits OEE: Availability

What it means: The current in the three output phases to the motor is unbalanced.^[4]^[6]

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Motor wiring problem

First checks, in this order

Check the wiring to the motor.

Fault code 59: Main motor converter alarm

Hits OEE: Availability

What it means: The converter's Safe Torque Off input is active, so the motor cannot make torque.^[4]^[6]

Also on: Applies to: Elektronikon Graphic (Mk5) with VSD converter, Atlas Copco VSD start and control cabinet and GHS 350 to 900 VSD+ vacuum pumps. Listed in both books; the cabinet book (6996 0242 10) says contact Atlas Copco, the GHS 350 to 900 VSD+ book lists the checks

Machine response: Machine stops, Main motor converter alarm with fault code

Likely causes

Emergency stop pressed or its circuit open
Pressure switch or temperature switch tripped
Wiring fault in the safety circuit

First checks, in this order

Check the emergency stop.
Check the pressure switch.
Check the temperature switch and the wiring of these devices.
If the cause is not found, contact Atlas Copco.

Neos code 0x1111 (4369): Main motor converter alarm

Hits OEE: Availability

What it means: The Neos converter sees too low a supply voltage.^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

Main supply voltage too low
Missing links in the control panel
Loose connectors at the converter control unit or controller
Tripped fuses on the secondary of transformer T1

First checks, in this order

Check that the main supply voltage is within limits.
Check the main fuses.
Check for loose connectors at the converter control unit and the controller.
Check for tripped fuses on the secondary of transformer T1 in the electrical panel.

Neos code 0x2312 (8978), 0x2314 (8980): Main motor converter alarm

Hits OEE: Availability

What it means: Overcurrent detected on the motor side of the converter.^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

Supply voltage out of limits
Motor side overcurrent

First checks, in this order

Check that the main supply voltage is within limits.

Neos code 0x2315 to 0x2317 (8981 to 8983): Main motor converter alarm

Hits OEE: Availability

What it means: A short circuit was detected in motor phase U (0x2315), V (0x2316) or W (0x2317).^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

Short circuit in one motor phase

First checks, in this order

Try to reset the fault.
If the code comes back, contact Atlas Copco.

Neos code 0x3210 (8976): Main motor converter alarm

Hits OEE: Availability

What it means: Over voltage detected by the converter.^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

Supply voltage too high

First checks, in this order

Check that the main supply voltage is within limits.
Check the main fuses.

Neos code 0x3221 (12817): Main motor converter alarm

Hits OEE: Availability

What it means: The main power supply voltage is too low.^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

Low supply voltage
Blown main fuse

First checks, in this order

Check that the main supply voltage is within limits.
Check the main fuses.

Neos code 0x3223 (12835): Main motor converter alarm

Hits OEE: Availability

What it means: The converter has detected a lost supply phase.^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

Missing supply phase
Blown main fuse

First checks, in this order

Check that the main supply voltage is within limits.
Check the main fuses.

Neos code 0x3224 (12836): Main motor converter alarm

Hits OEE: Availability

What it means: The DC link voltage has passed its maximum. The limit is lowered when the drive runs hot.^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

Converter too hot
High ambient temperature
Dirty heatsink or clogged cubicle inlet filter
Supply voltage too high

First checks, in this order

Let the drive cool down.
Check that the ambient temperature is within limits.
Clean the heatsink with compressed air and clean the cubicle inlet filter.
Make sure cool air can flow around the machine.
Check that the main supply voltage is within limits.

Neos code 0x3226 to 0x3228 (12838 to 12840): Main motor converter alarm

Hits OEE: Availability

What it means: Over voltage or over temperature detected in the IGBT of phase U (0x3226), V (0x3227) or W (0x3228).^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

Converter too hot
High ambient temperature
Dirty heatsink or clogged cubicle inlet filter
Supply voltage too high

First checks, in this order

Let the drive cool down.
Check that the ambient temperature is within limits.
Clean the heatsink with compressed air and clean the cubicle inlet filter.
Make sure cool air can flow around the machine.
Check that the main supply voltage is within limits.

Neos code 0x4311 (17169): Main motor converter alarm

Hits OEE: Availability

What it means: Over temperature detected in an IGBT of the converter.^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

High ambient temperature
Dirty heatsink
Clogged cubicle inlet filter
Poor air flow around the machine

First checks, in this order

Let the drive cool down.
Check that the ambient temperature is within limits.
Clean the heatsink with compressed air and clean the cubicle inlet filter.
Make sure cool air can flow around the machine.

Neos code 0x4312 (17170): Main motor converter alarm

Hits OEE: Availability

What it means: Over temperature detected in the converter heatsink.^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

High ambient temperature
Dirty heatsink
Clogged cubicle inlet filter
Poor air flow around the machine

First checks, in this order

Let the drive cool down.
Check that the ambient temperature is within limits.
Clean the heatsink with compressed air and clean the cubicle inlet filter.
Make sure cool air can flow around the machine.

Neos code 0x5020 to 0x5022 (20512 to 20514): Main motor converter alarm

Hits OEE: Availability

What it means: The emergency stop circuit is open, so the converter's Safe Torque Off is active. Code 0x5022 also reports a hardware fault.^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

Emergency stop button pressed
Loose connector at the converter control unit
Hardware fault (0x5022)

First checks, in this order

Check the emergency stop button.
Check for loose connectors at the converter control unit.

Neos code 0x5114, 0x5115 (20756, 20757): Main motor converter alarm

Hits OEE: Availability

What it means: The converter's internal power supply has tripped.^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

Internal converter power supply fault

First checks, in this order

Try to reset the fault.
If the code comes back, contact Atlas Copco.

Neos code 0x610C (24844): Main motor converter alarm

Hits OEE: Availability

What it means: The CAN link between the Elektronikon and the converter timed out.^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

Loose or damaged CAN cable
CAN termination switches set wrong

First checks, in this order

Check the CAN cable between the controller and the converter.
Check the CAN termination switches at both ends of the cable. Both should be in the off position.

Neos code 0x7130 (28976): Main motor converter alarm

Hits OEE: Availability

What it means: The converter has detected that the motor is too hot.^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

Main fan or air flow blocked
Too little cool air around the machine
Loose connector at the converter control unit

First checks, in this order

Let the motor cool down.
Make sure the main fan and the air flow in and out of the machine are not blocked.
Make sure cool air can flow around the machine.
Check for loose connectors at the converter control unit.

Neos code 0x8401 (33793): Main motor converter alarm

Hits OEE: Availability

What it means: The motor went faster than its maximum speed.^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

Motor overspeed

First checks, in this order

Try to reset the fault.
If the code comes back, contact Atlas Copco.

Neos code 0x8402 (33794): Main motor converter alarm

Hits OEE: Availability

What it means: The motor did not reach the requested speed during start-up.^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

Start-up against pressure that has not blown off yet

First checks, in this order

Do not reset straight away. Wait until the machine has depressurized (blow off).
If the code comes back, contact Atlas Copco.

Neos code 0x9001 (36865): Main motor converter alarm

Hits OEE: Availability

What it means: The converter's hardware enable signal is missing, so it will not run.^[5]

Also on: Applies to: Elektronikon Graphic (Mk5) with Neos converter, Atlas Copco GHS 1300 to 1900 VSD+ vacuum pumps.

Machine response: Machine stops, Main motor converter alarm with fault code and description

Likely causes

Loose connectors at the converter control unit or controller
Tripped fuses on the secondary of transformer T1

First checks, in this order

Check for loose connectors at the converter control unit and the controller.
Check for tripped fuses on the secondary of transformer T1 in the electrical panel.

Log it, or the same alarm comes back

A shutdown stops the compressor, and when compressed air drops, every machine that needs it stops too, so in OEE terms it is a breakdown for each line it feeds. Log the alarm, the compressor and the minutes lost on the lines; shutdown warnings and service warnings are early signs worth logging.

Reason code: the alarm plus the compressor, for example Atlas Copco GA element outlet temperature shutdown, compressor 2, so a cooler that clogs every summer shows up as a pattern.
Loss bucket: a stop that needs a reset, a part or a technician is an availability loss (breakdown). Stops shorter than your micro-stop threshold go to performance (minor stops). The six big losses page shows where each one belongs.
What to count: how often each code fires per week and the minutes it costs. Two numbers a week turn "that alarm comes up sometimes" into a ranked list. The MTBF and MTTR calculator and the downtime cost calculator do the math.

The free OEE tracker logs each stop with its reason and turns the week into a downtime Pareto, so the code that costs the most rises to the top.

fabrico.io has an air compressor troubleshooting guide. An alarm tells you what the controller measured, not what the lines downstream lost while the air was gone. Fabrico's camera-based OEE software syncs line camera video with machine data, so you can replay the moment a line stopped next to the cause.

Frequently asked questions

What does a shutdown warning mean on an Atlas Copco Elektronikon?

A shutdown warning level is a programmable level set just below the shutdown level. When a measurement such as element outlet temperature passes it, a message shows on the display and the general alarm LED lights, but the compressor keeps running. It is the controller telling you to fix the cause now, because if the reading keeps rising to the shutdown level the machine stops. The message clears by itself once the reading drops back.

How do I reset an alarm on an Atlas Copco compressor?

Fix the cause first. If you need to touch the machine, stop it, lock off the supply and depressurize it. Then reset the message at the Elektronikon. If a separate protection device tripped, such as the main motor overload relay, reset that device too, but only if your procedures allow it. Restart and watch the reading that caused the alarm. Reset service reminders only after the service is done. If the alarm comes back straight after a reset, stop resetting it and contact Atlas Copco service with the exact message and the serial number.

What does element outlet temperature shutdown mean?

The air and oil leaving the screw element got hotter than the shutdown limit, so the Elektronikon stopped the machine to protect it. A shutdown warning comes first at a lower level. Common causes are dirty coolers, poor ventilation or hot air recirculating, high room temperature, a fan that does not run, low or worn oil, and on water-cooled units warm or low cooling water. Clean the coolers, check the fan, oil and room ventilation, then reset. Levels depend on the machine: on Atlas Copco GHS VSD+ vacuum pumps the factory settings are 112 °C for the warning and 120 °C for the shutdown.

What do the service plan warnings A, B, C and D mean?

The Elektronikon groups service work into levels called A, B and so on. Each level has two intervals, running hours and real time hours, and the service warning comes at whichever is reached first. In the Atlas Copco example, level A is set to 4000 running hours or 8760 hours (one year). The machine keeps running. Do the service actions for the level shown (they are listed in your machine's preventive maintenance schedule), then reset that level in Menu, Service, Service plan. Next service shows what is due next, and History lists past services.

What is the main motor converter alarm on an Atlas Copco VSD compressor?

It means the frequency converter that drives the main motor has reported a fault, so the machine stops. The Elektronikon shows Main motor converter alarm together with the converter's own fault code. Open the Stop or Protections icon to read the code. Typical causes are converter overheating, supply problems such as low voltage or a lost phase, and internal converter faults. Check cooling air and the supply first, note the code, and call Atlas Copco service if it stays. The code list depends on the converter type, so look the code up in the instruction book for your machine.

Sources

Codes and meanings follow the manufacturer documentation below. Wording is ours, simplified for the shop floor; the manual for your exact model and software version wins if it differs.

See the moment the line stopped

Fabrico, a light MES with computer vision, syncs camera footage with machine and timeline data, so you can replay the exact moment the line stopped and review the cause next to the compressor alarm. Cameras also catch short stops and a line that is switched on but not producing, the losses nobody writes down. Machines connect through a PLC, a Fabrico IoT device or an AI camera.

Book a Fabrico demo

The lookup stays free.

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