Voltage warning high

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The DC bus voltage (VDC) has exceeded the 'Voltage warning high' limit. The motor continues to operate, but if the VDC remains high for 5-10 seconds, the inverter will trip with an Alarm 7 (Overvoltage). This can be caused by an excessively high supply voltage or fast motor deceleration with insufficient braking.

• High incoming AC line voltage (L1, L2, L3) exceeding the drive's rated input voltage or transient spikes on the grid.
• Regenerative energy from the motor (e.g., rapid deceleration, overhauling load) is flowing back into the DC bus and exceeding the internal voltage limits.
• Incorrect braking resistor sizing or fault in the braking chopper circuit, preventing proper dissipation of regenerative energy.
• Drive output connected to a motor with very high inertia that is coasting down too rapidly without braking.

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1. 1

   1. Measure the incoming AC line voltage (phase-to-phase) at terminals R, S, T and compare to the drive's rated input voltage; report any sustained overvoltage to facility maintenance.

2. 2

   2. Verify drive deceleration ramps (P2-01, P2-02) are set appropriately for the load inertia, consider increasing ramp times to reduce regenerative energy.

3. 3

   3. If an external braking resistor is installed, measure its resistance with an ohmmeter and compare to the specified value (P1-30); check connections to terminals BR+ and BR-.

4. 4

   4. Check parameter P1-30 (Braking Resistor Ohms) and P1-31 (Braking Resistor Power) for correct configuration relative to the installed resistor.

5. 5

   5. Monitor DC bus voltage (A01-01) in real-time during operation to identify when and under what conditions the warning triggers.