Applicable Systems
VF-AS1
Symptoms
The VF-AS1 reports an over-frequency fault. The output frequency exceeded the maximum configured frequency limit.
Possible Causes
- Frequency command exceeding the maximum frequency parameter setting
- External analog reference input exceeding the maximum scale
- Maximum frequency parameter set incorrectly for the application
Troubleshooting Steps
- Step 1: Check the frequency command source for values exceeding the limit
Command is within the frequency limit - Step 2: Verify the maximum frequency parameter is set correctly
Maximum frequency matches the motor rating - Step 3: Scale the analog reference input to the correct range
Reference input is scaled correctly
How to Reset
To reset: Reduce the frequency below the limit, then reset the fault.
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Source: Toshiba VF-AS1 Inverter Manual, Toshiba Mitsubishi-Electric Industrial Systems
Category: PLC & VFD
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