Yaskawa inverter Uv1 fault name: main circuit undervoltage
If the operation command is not entered (the inverter is stopping), the following conditions occur.
1. The DC voltage of the main circuit is lower than the set value of L2-05 (the detection value of the undervoltage (UV) of the main circuit).
2. 200V class: about 190V (160V for single phase)
3. 400V level: about 380V (350V when the setting of E1-01 (input voltage setting) is less than 400.) )
Yaskawa inverter Uv1 fault cause 1: the input power supply is out of phase
Confirm whether the wiring of the main circuit power supply is disconnected or incorrectly wiring. Wiring is done correctly.
Reason 2: The terminal block of the input power supply is loose
Confirm that the terminals are not loose.
Cause 3: The power supply voltage is faulty
Confirm the voltage. Adjust the voltage to within the power specification range of the inverter.
Reason 4: A power outage occurs
Improve power supply.
Yaskawa inverter Uv1 failure cause 5: the internal circuit of the inverter is aging
Use U4-05 (Capacitor Maintenance) to check the maintenance period of the capacitor. If the U4-05 is more than 90%, replace the inverter.
Yaskawa inverter Uv1 fault cause 6: due to the insufficient capacity of the power transformer, the inrush current of the inverter reduces the power supply voltage
Check whether an alarm occurs when a circuit breaker for wiring, a leakage circuit breaker (with overcurrent protection function), or an electromagnetic contactor is turned on. Modify the capacity of the power transformer.
Reason 7: The temperature inside the inverter is abnormal
Confirm the ambient temperature of the inverter. If the charging indicator is bad (the indicator light is disconnected), replace the inverter.
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