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| Chapter 13. Troubleshooting & Maintenance | |||||
13.2 | Fault Remedy |
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Protective |
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| CAUTION: |
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| When an overcurrent fault occurs, operation must be started after the cause is removed to | ||||||
Overcurrent | avoid damage to IGBT inside the inverter. |
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| z Accel/Decel time is too short compared to | ) Increase the Accel/Decel time. |
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| the GD2 of the load. | ) Replace | the | inverter | with | appropriate |
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| z Load is greater than the inverter rating | ||||||
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| capacity. |
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| z Inverter output is issued when the motor is | ) Resume operation after stopping the motor | |||||
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| free running. | or use H22 (Speed search) in Function group | ||||
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| z Output short circuit or ground fault has | 2. |
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| occurred. | ) Check output wiring. |
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| z Mechanical brake of the motor is operating |
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| too fast. | ) Check the mechanical brake. |
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| z Ground fault has occurred at the output | ) Check the wiring of the output terminal. | |||||
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| wiring of the inverter |
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Ground fault | z | The insulation of the motor is damaged due | ) Replace the motor. |
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| current |
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| z Load is greater than the inverter rating. | ) Upgrade the capacity of motor and inverter | ||||||
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| z Inverter capacity is incorrectly selected. | or reduce the load weight. |
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| Inverter | ) Select correct inverter capacity. |
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| overload | z | Torque boost scale is set too large. |
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| ) Reduce torque boost scale. |
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Overload trip | z Cooling system has faults. | ) Check for alien substances clogged in the | ||||||
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| z An old cooling fan is not replaced with a | heat sink. |
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Heat sink | ) Replace the old cooling fan with a new one. | |||||||
| new one. |
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| overheat | z | Ambient temperature is too high. | ) Keep ambient temperature under 40°C. | ||||
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| z Faulty contact of magnetic switch at output | ||||||
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| ) Make connection of magnetic switch at | ||||||
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| z | Faulty output wiring | output of the inverter securely. |
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Output Phase |
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| ) Check output wiring. |
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| loss | z | An alien substance is clogged in a | ) Check the ventilating slot and remove the | ||||
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| ventilating slot. | clogged substances. |
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Cooling fan | z | Inverter has been in use without changing a | ) Replace the cooling fan. |
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| fault |
| cooling fan. |
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| z Decel time is too short compared to the | ) Increase the Decel time. |
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| GD2 of the load. |
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| z Regenerative load is at the inverter output. | ) Use Dynamic Brake Unit. |
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Over voltage | z Line voltage is too high. | ) Check whether line voltage exceeds its | ||||||
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| z Line voltage is low. | rating. |
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| ) Check whether line voltage is below its | ||||||
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| z Load larger than line capacity is connected | rating. |
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| ) Check the incoming AC line. Adjust the line | ||||||
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| to line (ex: welding machine, motor with high | capacity corresponding to the load. |
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| starting current connected to the commercial |
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Low voltage |
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| line). |
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| z Faulty magnetic switch at the input side of | ) Change a magnetic switch. |
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| the inverter. |
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| z | Motor has overheated. | ) Reduce load weight and operating duty. | ||||
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| z Load is greater than inverter rating. | ) Change inverter with higher capacity. | |||||
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| z ETH level is set too low. | ||||||
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| ) Adjust ETH level to an appropriate level. | ||||||
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| z Inverter capacity is incorrectly selected. | ||||||
Electronic | z | Inverter has been operated at low speed for | ) Select correct inverter capacity. |
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| thermal |
| too long. | ) Install a cooling fan with a separate power | ||||
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| supply. |
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