| Name | Cause(s) | Display on digital operator | Display on remote operator/copy unit |
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|---|---|---|---|---|
| Over-current protection |
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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| Braking resistor overload protection |
When the regenerative braking resistor exceeds the usage time allowance or an over-voltage caused by the stop of the BRD function is detected, 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, the inverter trips and turns off its output. |
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| EEPROM error *2 | When the built-in EEPROM memory has problems due to noise or excessive temperature, the inverter trips and turns off its output. |
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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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| CT(Current transformer) error |
If a strong source of electrical interference is close to the inverter or abnormal operations occur in the builtin CT(Current transformer), the inverter trips and turns off its output. |
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| CPU error | When a malfunction in the built-in CPU has occurred, the inverter trips and turns off its output. |
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| External trip | When a signal to an intelligent input terminal configured as EXT has occurred, the inverter trips and turns off its output. |
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| USP error | An error occurs when power is cycled while the inverter is in RUN mode if the Unattended Start Protection (USP) is enabled. The inverter trips and does not go into RUN mode until the error is cleared. |
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| Ground fault | The inverter is protected by the detection of ground faults between the inverter output and the motor during power-up tests. This feature protects the inverter only. |
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| Input over-voltage protection |
When the input voltage is higher than the specified value, it is detected 60 seconds after power-up and the inverter trips and turns of its output. |
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| Instantaneous power failure |
When power is cut for more than 15msec., the inverter trips and turns off its output. If power failure continues, the error will be cleared. The inverter restarts if it is in RUN mode when power is cycled. |
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| Inverter thermal trip |
When the inverter internal temperature is higher than the specified value, the thermal sensor in the inverter module detects the higher temperature of the power devices and trips, turning off the inverter output. |
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| Gate array error | Communication error has occured between CPU and gate array. |  |
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| Missing phase | One of three lines of 3-phase power supply is missing. |  |
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| IGBT error | When instantaneous over-current has occurred, the inverter trips and turns off its output to protect main circuit element. |
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| Thermistor error | When the thermistor inside the motor detects temperature higher than the specified value, the inverter trips and turns off its output. |
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| Expansion card 1 connection error |
An error has been detected in an expantion card or at its connecting terminals. |  |
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| Expansion card 2 connection error |
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| Out of operation due to under-voltage |
Due to insufficient voltage, the inverter has turned off its output and been trying to restart. If it fails to restart, it goes into the under-voltage error. |
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occurs, be sure to confirm the parameter data values are still correct.
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