Chapter 5 Troubleshooting 
5.4 Low Voltage (Lv)
Low voltage
Is input power correct? Or power cut, Yes | ||||||||||||||
including momentary power loss |
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| No |
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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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| and check connection |
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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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| such as change power supply | |||||||||
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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| Suitable power | |||||||||
breaker and magnetic |
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contactor is ON |
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Check if voltage between | No | ||
+2 (+2/B1) and - is greater than | |||
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400VDC (for 460V models) |
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Yes
Maybe AC motor drive has malfunction. Please contact DELTA.
Control circuit has malfunction or misoperation due to noise. Please contact DELTA.
Revision July 2008, EG03, SW V1.06 |
