| Name | Cause(s) | Display on digital operator |
Display on remote operator/copy unit |
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|---|---|---|---|---|
| Over current | The inverter output was short-circuited, or the motor shaft is locked or has a heavy load. These conditions cause excessive current for the inverter, so the inverter output is turned OFF. |
While at constant speed |
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| During deceleration |
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| During acceleration |
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| Others |  |
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| Overload protection *1 | When a motor overload is detected by the electronic thermal function, the inverter trips and turns OFF its output. |
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| Over voltage protection | When the DC bus voltage exceeds a threshold, due to regenerative energy from the motor. |  |
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| EEPROM error *2,3 | When the built-in EEPROM memory has problems due to noise or excessive temperature, the inverter trips and turns OFF its output to the motor. |
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| Under-voltage error | A decrease of internal DC bus voltage below a threshold results in a control circuit fault. This condition can also generate excessive motor heat or cause low torque. The inverter trips and turns OFF its output. |
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| CPU error | A malfunction in the built-in CPU has occurred, so the inverter trips and turns OFF its output to the motor. |
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| External trip | A signal on an intelligent input terminal configured as EXT has occurred. The inverter trips and turns OFF the output to the motor. |
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| USP *4 | When the Unattended Start Protection (USP) is enabled, an error occurred when power is applied while a Run signal is present. The inverter trips and does not go into Run Mode until the error is cleared. |
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| Ground fault *5 | The inverter is protected by the detection of ground faults between the inverter output and the motor during powerup tests. This feature protects the inverter, and does not protect humans. |
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| Input over-voltage | When the input voltage is higher than the specified value, it is detected 100 seconds after powerup and the inverter trips and turns OFF its output. |
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| Inverter thermal trip | When the inverter internal temperature is above the threshold, the thermal sensor in the inverter module detects the excessive temperature of the power devices and trips, turning the inverter output OFF. |
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| Driver error | An internal inverter error has occurred at the safety protection circuit between the CPU and main driver unit. Excessive electrical noise may be the cause. The inverter has turned OFF the IGBT module output. |
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| Thermistor | When a thermistor is connected to terminals [PTC] and [CM1] and the inverter has sensed the temperature is too high, the inverter trips and turns OFF the output. |
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| Emergency Stop | Emergency stop signal given. |  |
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| Communications error | The inverter's watchdog timer for the communications network has timed out. |  |
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