
E6581381
13.4 How to determine the causes of other problems
The following table provides a listing of other problems, their possible causes and remedies.
Problems |
| Causes and remedies |
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The motor runs in the | • | Invert the phases of the output terminals U, V and W. |
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wrong direction. | • | Invert the forward/reverse |
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| • | ⇒ See section 6.3 "Assignment of functions to control terminals". |
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| Change the setting of the parameter HT in the case of panel operation. |
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The motor runs but its | • | The load is too heavy. Reduce the load. |
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speed does not change | • | The soft stall function is activated. Disable the soft stall function. ⇒ See section 5.12. |
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normally. | • | The maximum frequency HJ and the upper limit frequency WN are set too low. |
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| • | Increase the maximum frequency HJ and the upper limit frequency WN. |
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| The frequency setting signal is too low. Check the signal set value, circuit, cables, etc. |
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| • | Check the setting characteristics (point 1 and point 2 settings) of the frequency setting |
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| • | signal parameters. ⇒ See section 6.5. |
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| If the motor runs at a low speed, check to see that the stall prevention function is |
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| activated because the torque boost amount is too large. |
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| Adjust the torque boost amount (XD) and the acceleration time (CEE). |
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| ⇒ See section 5.11 and 5.1. |
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The motor does not | • | The acceleration time (CEE) or the deceleration time (FGE) is set too short. |
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| Increase the acceleration time (CEE) or the deceleration time (FGE). |
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smoothly. |
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A too large current flows | • | The load is too heavy. Reduce the load. |
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into the motor. | • | If the motor runs at a low speed, check whether the torque boost amount is too large. ⇒ |
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| ⇒ See section 5.11. |
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The motor runs at a higher | • | The motor has an improper voltage rating. Use a motor with a proper voltage rating. |
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or lower speed than the | • | The motor terminal voltage is too low. |
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specified one. |
| Check the setting of the base frequency voltage parameter (XNX) . |
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| ⇒ See section 6.12.5. |
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| • | Replace the cable with a cable larger in diameter. |
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| The reduction gear ratio, etc., are not set properly. Adjust the reduction gear ratio, etc. |
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| • | The output frequency is not set correctly. Check the output frequency range. |
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| • | Adjust the base frequency. ⇒ See section 5.9. |
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The motor speed | • | The load is too heavy or too light. Reduce the load fluctuation. |
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during operation. | • | The inverter or motor used does not have a rating large enough to drive the load. |
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| • | Use an inverter or motor with a rating large enough. |
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| Check whether the frequency setting signal changes. |
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| • | If the V/F control selection parameter RV is set at , check the vector control setting, |
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| operation conditions, etc. ⇒ See section 5.10. |
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Parameter settings cannot |
| Change the setting of the parameter H (prohibition of change of parameter |
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be changed. |
| setting) to (permitted) if it is set at (prohibited). |
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| * | For reasons of safety, some parameters cannot be reprogrammed while the inverter is |
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| running. ⇒ See section 4.2.6. |
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How to cope with parameter | 13 | |||
If you forget parameters | • | You can search for all reset parameters and change their settings. |
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which have been reset |
| ⇒ See section 4.2.3 for details. |
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If you want to return all | • | You can return all parameters which have been reset to their default settings. |
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reset parameters to their |
| ⇒ See section 4.2.7 for details. |
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respective default settings |
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