Chapter 7 Troubleshooting
7.4 Low Voltage (Lv)
Low voltage
Is input power correct? Or power cut, Yes | ||||||||||||||
including momentary power loss |
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| Restart after reset | |||||
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Check if there is any malfunction | Yes |
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| Change defective component |
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component or disconnection in |
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power supply circuit |
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| No |
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Check if voltage is |
| No |
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| Make necessary corrections, | |||||||
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within specification |
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| system for requirement | ||||||
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| Yes |
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Check if there is heavy load |
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| Using the different power |
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with high start current in the |
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| supply for this drive and |
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same power system |
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| heavy load system |
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Check if Lv occurs when | Yes | |||||||||||||
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breaker and magnetic |
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| transformer capacity | ||||
contactor is ON |
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No
Check if voltage between +1/+2
and - is greater thanNo 200VDC (for 230V models) 
400VDC (for 460V models)
517VDC (for 575V models)
Yes
Yes
Maybe AC motor drive has malfunction. Please contact DELTA.
Control circuit has malfunction or misoperation due to noise. Please contact DELTA.
Revision August 2006, SE08, SW V2.61 |
