The "CHRG CHARGING" fault on your Parker AC890 drive indicates an issue within the pre-charge circuit of the drive. This circuit is essential for safely charging the DC bus capacitors when power is first applied to the drive.
Troubleshooting Steps:
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Check Input Voltage: Verify that the correct AC input voltage is being supplied to the drive and that it is within the acceptable range specified in the drive manual.
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Inspect Drive for Damage: Visually inspect the drive for any signs of physical damage, such as burnt components or bulging capacitors. Do not touch any internal components until the drive is fully de-energized and the DC bus capacitors have discharged (allow several minutes after power-off).
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Measure DC Bus Voltage (Carefully!):
- Safety First: This step requires extreme caution due to the high voltages involved. Only qualified personnel should perform this measurement. Ensure the drive has been powered off for the appropriate discharge time before attempting any internal measurements.
- After powering on the drive and the fault appearing, carefully measure the voltage across the DC bus capacitors. If the pre-charge circuit is working partially, you might see some voltage, but it won't reach the expected level. If the pre-charge circuit is completely failing, the voltage might be very low or zero.
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Check Pre-Charge Resistors (if accessible and safe):
- Safety First: Ensure the drive is completely de-energized and the DC bus capacitors are discharged before attempting to measure resistance.
