Applicable Systems
ACS355
Symptoms
ABB ACS355 drive reports fault during normal operation indicating drive system issue requiring diagnostic evaluation.
Possible Causes
- Output short circuit detected by drive output current monitoring
- Analog input signal out of range causing control reference error
- Drive internal DC bus undervoltage during motor start
- Serial communication timeout on Modbus RTU interface
Troubleshooting Steps
- Step 1: Read fault code on ACS880 panel
Fault code displayed on keypad - Step 2: Check motor cable for short circuits
Motor cable insulation resistance exceeds 1 MOhm - Step 3: Verify analog input signal at drive terminal
Analog input signal within 0-10V or 0-20mA range - Step 4: Check Modbus RTU communication parameters
Baud rate, parity, and slave ID match network configuration
How to Reset
Reset by: 1) Correct the fault condition. 2) Cycle power or press RESET. 3) Run test. 4) Verify normal operation.
Common Replacement Parts
- ACS355-CTL-01: ABB ACS355 control board (Verify frame size and voltage)
Frequently Asked Questions
- Q: What causes DC bus undervoltage at motor start?
DC bus undervoltage at start typically indicates insufficient supply capacity, loose power connections, or a weak DC bus capacitor. Check supply voltage, tighten power terminals, and measure DC bus capacitance if the drive is over 5 years old.
Source: ABB ACS355 Manual
Category: Electrical