Chapter 5 Troubleshooting
5.1 Over Current (OC)
ocA
Ov
dur ing ac celeratio n
o cd
Over- c urrent during decele ration
O C
Ove r curren t
Remove short c ircuit or groun d fault
Yes | Check if there is any short c irc uits and |
| groun ding between t he U, V, W and motor |
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| No | No | No |
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| Reduce the load or | Yes |
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| increase the power |
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| Check if load is too large |
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| of AC motor drive |
| No | No | No |
N o Reduce torque |
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No Suitable torque |
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| compen sation | compensation |
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| Yes |
| Ye s |
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Red uce tor que |
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com pensa tion | Check if |
| Check if |
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No | No |
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acceleration time | dec eleration time |
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| is too short by |
| is too short by |
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| load inertia. |
| loa d inertia. |
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Maybe AC motor dri ve | Ye s |
| Yes |
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has malfunction or error |
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due to noise. Pleas e |
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| No | Has l oad cha nged |
contact DELTA. |
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| suddenly? | |
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| Ye s |
| Yes Can ac celerati on | Yes | Can dec elerati on | |||||
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| time be made longer? |
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| time be made l onger? | ||
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| No |
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| No | ||
| Inc re ase ac cel/dec el |
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| Reduce load or increase | |
| time |
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| the power of AC motor | |
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| driv e | |
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| Reduce lo ad or in crease |
| Check brake |
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| the power of AC motor |
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| me thod. P lease |
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| dri ve |
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| co ntact D ELTA |
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Revision July 2008, EG03, SW V1.06 |
