TRANSFER FAULT ABB — ATS Transfer Failure
At a glance
- Severity
- FAULT STOP
- Domain
- TRANSFER_SWITCH_SYSTEM
- Reference standard
- IEC 60947-6-1 / CEI 64-8
What it means
The ATS fails to transfer the load between sources (mains/gen or mains/mains): with mains absent the load stays on UPS until exhaustion even with a healthy genset.
Probable causes
- Control logic or relays failed
- Switch operator (motor/servo) failed
- Missing source quality consent (voltage/frequency out of window)
- Interlocks or jumpers in the wrong position after maintenance
Where to start
Verify both sources (measured voltage and frequency) and the current switch position and interlocks.
Full guided diagnosis in the app
The diagnostic tree for this fault has 3 guided steps with measurements, checks and resolutions. You'll find it in DataCIQ, one of the five IndexOS apps: free, works offline.
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The same fault on other brands
More ABB codes
- FEED MISMATCH — Wrong A/B Feed Assignment
- JOINT OVERHEAT — Busway / Tap-off Overheat
- STS FAULT — STS Transfer Failure
- 2310 — Overcurrent Fault
- 2330 — Ground Fault
- 3210 — DC Bus Overvoltage Fault
- 3220 — DC Bus Undervoltage Fault
- 4310 — Drive Overtemperature Fault