OI Roundtable

ABB ACS50 Faults,  Errors, and Alarms

Guys here's a quick and easy guide for troubleshooting ACS50 faults, errors, alarms or whatever you want to call them. Straight from the manual, the troubleshooting guide is simple on these.

ACS50 has two status indication LEDs, visible through the front cover. If the drive detects a problem, the red LED will blink. After fixing the problem, reset by switching the start signal off. If start is off already, turn it first on and then off again. See the list below for the fault codes (= the number of LED blinks).

Remember the basics, Green LED On and Red LED off, ACS50 operates normally
Green LED On and Red LED Blinking means the protective function has been activated. The number of blinks indicates the fault code.

Green LED Blinking and Red LED Blinking means the ACS50 will reset automatically within 3 seconds. Warning! Motor starts, if the start signal is on so be aware of this.  Automatic reset will function if the AUTORESET is ON. This is configured using the DIP switches.

Ok here's the possible causes and what to do:

• 1. DC overvoltage. 1) Mains voltage is too high: Check supply. 2) Deceleration ramp time is too short compared to the load. Automatic reset will function if the AUTORESET is ON
• 2. DC undervoltage. Mains voltage is too low: Check supply. Automatic reset will function if the AUTORESET is ON
• 3. Output short circuit: Switch off the power and check the motor windings and motor cable.
• 4. Output overcurrent. 1) Acceleration time is too short compared to the load inertia: Increase ACC/DEC time with potentiometer. 2)Motor and drive sizes do not match: Check motor.
• 5. Reserved
• 6. Analogue input value is less than 4 mA/2 V. (*) Note: This supervision is active if AI OFFSET is ON.
• 7. Motor overload (I2t overload): 1) Check the load, and verify that the motor size is suitable for ACS50. 2) Verify that setting of MOTOR I NOM potentiometer is correct.
• 8. Inverter overload or excessive internal temperature: 1) Load is too high or 2) drive cooling is insufficient.
• 9. Other fault. Internal error. Turn power off and on again. If problem persists replace the unit

Nice job!

(https://www.obsoleteindustrial.com/i20/acs50-fault-alarm.png)

I believe the troubleshooting guide pertains to all these models:

• ACS50-01N-01A4-1
• ACS50-01N-02A2-1
• ACS50-01N-01A4-2
• ACS50-01N-02A2-2
• ACS50-01N-04A3-2
• ACS50-01N-07A6-2
• ACS50-01N-09A8-2
• ACS50-01E-01A4-1
• ACS50-01E-02A2-1
• ACS50-01E-01A4-2
• ACS50-01E-02A2-2
• ACS50-01E-04A3-2
• ACS50-01E-07A6-2
• ACS50-01E-09A8-2