What does Atlas Copco GA 37/45 VSD converter alarm 0x1111 mean?
Short answer: Drive undervoltage fault. If your Atlas Copco GA 37 VSD / GA 45 VSD (Elektronikon Graphic controller) is showing Converter alarm 0x1111 — Undervoltage, the controller has logged a specific, documented condition. This page covers what it means, what causes it, what you can safely fix yourself, and when — and why — it takes a technician.
What exactly is the machine telling you?
The frequency converter reports supply voltage too low or missing links in the control panel. The instruction book's remedy is to check that the main supply voltage meets specification and that the main fuses are intact.
Which machines show this?
Atlas Copco GA 37 VSD and GA 45 VSD variable-speed compressors with the Elektronikon Graphic controller. Because the motor is fed through a frequency converter, these machines add a second layer of fault reporting: alongside normal compressor messages, the drive raises converter alarms in hexadecimal — 0x1111, 0x2312, 0x2314 and similar — which the Elektronikon relays to the display. The instruction book documents remedies for only a handful of these and says to contact Atlas Copco for the rest. Practical tip: log the exact hex code and what was happening on the plant's power supply at that moment; most of these alarms trace back to supply-voltage quality rather than the compressor.
What causes it?
- Site supply voltage too low or sagging when large loads start elsewhere
- A brownout or utility event at the moment of the trip
- Blown main fuses or missing links in the panel (technician finding)
Can you fix it yourself?
Barely — staff can note whether other equipment saw the same sag, restart cleanly after voltage stabilizes, and log when it happens. The actual checks are electrical.
Step by step — what to try, in order:
- Check whether other equipment on the same supply is also seeing low voltage/brownouts
- Perform a clean power-down and restart after voltage stabilizes
- Log when the fault occurs (e.g. when large loads start elsewhere in the plant)
When do you need a technician — and why?
Verifying supply voltage against spec and inspecting main fuses happens inside a high-voltage drive cabinet — electrician-only work, and Atlas Copco if the code persists in spec.
If it does come to a service call and you're in Nashville, TN or Birmingham, AL, we maintain independently compiled lists of local companies that service industrial air compressors — real businesses with verified contact information, none of whom paid to be listed.
Related questions
What does Converter alarm 0x1111 — Undervoltage mean on an Atlas Copco GA 37 VSD / GA 45 VSD (Elektronikon Graphic controller)?
Drive undervoltage fault. The frequency converter reports supply voltage too low or missing links in the control panel. The instruction book's remedy is to check that the main supply voltage meets specification and that the main fuses are intact.
Can I fix Converter alarm 0x1111 — Undervoltage on an Atlas Copco GA 37 VSD / GA 45 VSD (Elektronikon Graphic controller) myself?
Barely — staff can note whether other equipment saw the same sag, restart cleanly after voltage stabilizes, and log when it happens. The actual checks are electrical.
When does Converter alarm 0x1111 — Undervoltage on an Atlas Copco GA 37 VSD / GA 45 VSD (Elektronikon Graphic controller) need a technician?
Verifying supply voltage against spec and inspecting main fuses happens inside a high-voltage drive cabinet — electrician-only work, and Atlas Copco if the code persists in spec. Fuse checks and supply-voltage measurement inside the cabinet are for a qualified electrician; if voltage is in spec and the code persists, call Atlas Copco.
Verified against service documentation: Atlas Copco GA 37 VSD / GA 45 VSD (Elektronikon Graphic controller) documentation for Converter alarm 0x1111 — Undervoltage (manualslib.com)