Troubleshooting ABB ACS380 Fault 7310: Overcurrent Guide

A technical deep-dive into the 7310 Overcurrent fault on ABB ACS380 drives. Learn about mechanical jams, electrical shorts, and parameter tuning to resolve this trip.

 

ABB ACS380 Troubleshooting: Fault 7310

Fault 7310
Description: Overcurrent (Instantaneous Peak)

The 7310 Overcurrent fault on an ACS380 indicates that the drive's output current has reached the hardware trip level. This is a protective measure to prevent the internal IGBTs (power transistors) from burning out due to excessive load or a short circuit.

Primary Causes

• Sudden Load Increase: The machinery driven by the motor (pump, conveyor, mixer) has jammed or become overloaded.
• Short Deceleration/Acceleration: The ramp times are too aggressive for the inertia of the load.
• Electrical Short: A short circuit in the motor cables or the motor windings themselves.
• Incorrect Motor Data: The parameters in Group 99 do not match the motor nameplate.
• Drive Undersized: The drive is too small for the motor and application torque requirements.

Troubleshooting Steps

• Step 1: Inspect the Load: Disconnect the motor from the machine and try running the motor alone. If it runs without tripping, the issue is mechanical (a jam or high friction).
• Step 2: Check Motor Insulation: Disconnect the motor cables from the drive and use a Megger to test the motor and cables for a phase-to-ground or phase-to-phase short.
• Step 3: Verify Ramp Times: Check Parameter 23.11 (Acceleration time) and 23.12 (Deceleration time). Increase these values to see if the fault clears.
• Step 4: Confirm Motor Data: Ensure Parameter 99.06 (Motor nominal current) is set exactly to the value on the motor nameplate.
• Step 5: Check Encoder/Pulse (if used): If you are running in Closed Loop, check the encoder wiring and Parameter 92 settings. Incorrect feedback can cause current spikes.

Note: If the 7310 fault occurs immediately upon power-up or as soon as the "Start" command is given (even with the motor disconnected), the internal power module of the drive may be damaged.

Related Parameters

Parameter	Name	Suggested Action
99.06	Motor nominal current	Must match motor nameplate Amps.
23.11	Acceleration time	Increase if fault occurs during start-up.
30.17	Maximum current	Verify this is not set lower than the required starting torque.
97.01	Switching frequency	In some cases, lowering the frequency can help reduce peak current noise.