Applicable Systems
AC500
AC590
ACS580
ACS880
Symptoms
DC link capacitor imbalance detected in power module.
Possible Causes
- DC link capacitor degradation
- Capacitor bank unbalance
- Power module hardware aging
Troubleshooting Steps
- Step 1: Check DC link voltage balance
Voltages balanced across capacitor bank - Step 2: Inspect capacitors for swelling or leakage
No physical damage - Step 3: Replace power module if imbalance persists
New module shows balanced DC link
How to Reset
Reset via control panel after capacitor repair.
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Source: ABB ACS580 Firmware Manual
Category: PLC & VFD
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