Oh Fault; Relay Non-Suction Fault; Inconsistent Voltage Values Generated By The Switching Power Supply; Output Out Of Phase (E.olf) - Veichi AC310 Service Manual

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AC310 Universal AC Drive Service Manual

4.5 OH Fault

1. The fan is blocked; the fan does not rotate or the speed is too low.

Checking method: Check with the normal fan, or use a speed tester to measure. If the

fan is normal, then check whether the driving circuit is faulty, (Note: in high-power

machines is sure to open the fan to see whether the fan is blocked)

Solution: Replace the fan or overhaul its driving circuit.

2. IGBT module temperature detection unit failure This circuit failure will lead to false

alarms.

3. IGBT module thermal paste is less or heat sink is not qualified.

4. Failure of OH detection circuit on the control board.

Check method: Replace the control board with a good one to see if it fails.

Countermeasure: According to the control board OH repair method to repair.

5. The site temperature is too high, or the ventilation of the place where the AC drive

is installed is not very good.

1. Switching power supply 24V generates wrong voltage

Cause: Relay will not close until 24V.

Solution: according to the switching power supply maintenance way to repair

2. Relay circuit is faulty.

Solution: Repair according to the relay circuit.

4.7 Inconsistent Voltage Values Generated by the Switching

Power Supply

1. Measure whether the switching MOS tube (Q1=STFW3N150) is damaged.

2. Measure the voltage at both ends of the regulator Z1 at the switching power supply

when powering up, it should be about 12V.

3. Whether UC3844 is damaged.

4. In the switching power supply maintenance to the diode damage.

1. Whether the driving circuit on the power supply board is abnormal

Cause: If there is a problem with one phase of the driving circuit on the power supply

board, resulting in no voltage output from the item, it will report a fault.

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