Atlas Copco GA VSD Fault Codes: Drive Troubleshooting Guide

Atlas Copco GA VSD Faults: Drive-Specific Troubleshooting

The Atlas Copco GA VSD (Variable Speed Drive) brings energy savings and smooth control, but it also introduces a new set of controller messages. If your GA VSD compressor throws a drive-related fault, use this guide to interpret the most common codes and run safe first checks.

Applies To

Atlas Copco GA VSD rotary screw compressors
Elektronikon controllers paired with integrated drives

Before You Start

Lock out and tag out before opening panels.
Record the exact fault code and the conditions when it appeared.
Do not reset repeatedly without addressing the root cause.

Most Common GA VSD Drive Faults

1) A017 – Drive Not Healthy

Meaning: The VSD is reporting a fault or will not come ready.
First checks: Perform a clean power cycle, inspect drive keypad LEDs, reseat interface board cables, confirm cabinet fans operate, check ambient temperature.
If it persists: Verify incoming power quality, confirm correct parameter set, review the drive’s trip log.

2) F020 – Overcurrent

Meaning: The drive detected excessive current to the motor.
First checks: Inspect for mechanical binding in the airend, check inlet valve movement, verify belts/couplings, confirm no downstream restriction causing sudden load spikes.

3) F023 – Overvoltage

Meaning: Incoming mains voltage is above limits.
First checks: Measure supply voltage at mains, verify stability, confirm braking resistor circuit on VSD units is intact.

4) F006 / F011 – Inverter or Motor Overtemperature

Meaning: Either the drive module or the motor windings are too hot.
First checks: Clean coolers and fans, confirm airflow direction, check ambient temperature, verify sensor wiring.

5) Converter or Communication Timeout

Meaning: The Elektronikon lost communication with the VSD.
First checks: Inspect comm cables and reseat connectors, confirm service switch position, perform a full power-down and restart both devices together.

Fast GA VSD Checks That Solve Many Trips

Reseat low-voltage connectors on the drive, controller, and interface board.
Verify cooling fans run and spin in the correct direction.
Confirm incoming voltage is stable and within spec.
Check that drive parameters match the machine; mismatched values after a swap can trigger faults.

Common Mistakes With GA VSDs

Power cycling until it runs: This stresses electronics and hides intermittent faults. Fix the root cause.
Clearing parameter errors without verifying: Always reload from a known good set, not guesses.
Overlooking cooling: Even a partially blocked cooler or failed fan will trigger repeated drive overtemp trips.

Recommended Preventative Maintenance Parts

Air filters to prevent excess load.
Oil filters to protect lubrication circuits in drive-cooled elements.
Air/oil separators to maintain low differential pressure.
Lubricants compatible with GA VSD requirements.

When To Call a Technician

Repeated overcurrent or overvoltage trips after basic checks.
Parameter corruption you cannot verify or reload.
Evidence of drive module damage, arcing, or burnt odor inside cabinet.

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