Protective And Diagnostic Functions - Omron 3G3JV Manual

Protective and Diagnostic
Functions
Fault Detection (Fatal Error)
The Inverter will detect the following faults if the Inverter or motor burns or the internal circuitry of the Inverter malfunctions. When the
Inverter detects a fault, the fault code will be displayed on the Digital Operator, the fault contact output will operate, and the Inverter
output will be shut off causing the motor to coast to a stop. The stopping method can be selected for some faults, and the selected
stopping method will be used with these faults. If a fault has occurred, refer to the following table to identify and correct the cause of
the fault. Use one of the following methods to reset the fault after restarting the Inverter. If the operation command is being input,
however, the reset signal will be ignored. Therefore, be sure to reset the fault with the operation command turned off.
• Turn on the fault reset signal. A multi-function input (n36 to n39) must be set to 5 (Fault Reset).
• Press the STOP/RESET Key on the Digital Operator.
• Turn the main circuit power supply off and then on again.
Fault Displays and Processing
Fault display Fault name and meaning
Overcurrent (OC)
The Inverter output current is as high
as or higher than 200% of the rated
output current.
Overvoltage (OV)
The main circuit DC voltage has
reached the overvoltage detection level
(200-V models: 410 V DC min.; 400-V
models: 820 V DC min.).
Main circuit undervoltage (UV1)
The main circuit DC voltage has
reached the undervoltage detection
level (200 V DC for the 3G3JV-A2j,
160 V DC for the 3G3JV-ABj, and 400
V DC for the 3G3JV-A4j).
Radiation fin overheated (OH)
The temperature of the radiation fins of
the Inverter has reached 110_C ±
10_C.
• A short-circuit or ground fault has occurred and at the Inverter output.
→
Check and correct the motor power cable.
• The V/f setting is incorrect.
→
Reduce the V/f set voltage.
• The motor capacity is too large for the Inverter.
→
Reduce the motor capacity to the maximum permissible motor capacity.
• The magnetic contactor on the output side of the Inverter has been opened and closed.
→
Rearrange the sequence so that the magnetic contactor will not open or close while the Inverter
has current output.
• The output circuit of the Inverter is damaged.
→
Replace the Inverter.
• The deceleration time is too short.
→
Increase the deceleration time.
• The power supply voltage is too high.
→
Decrease the voltage so it will be within specifications.
• There is excessive regenerative energy due to overshooting at the time of acceleration.
→
Suppress the overshooting as much as possible.
• Power supply to the Inverter has phase loss, power input terminal screws are loose, or the power
cable is disconnected.
→
Check the above and take necessary countermeasures.
• Incorrect power supply voltage
→
Make sure that the power supply voltage is within specifications.
• Momentary power interruption has occurred.
→
Use the momentary power interruption compensation (Set n47 so that the Inverter restarts after
power is restored)
→
Improve the power supply.
• The internal circuitry of the Inverter is damaged.
→
Change the Inverter.
• The ambient temperature is too high.
→
Ventilate the Inverter or install a cooling unit.
• The load is excessive.
→
Reduce the load.
→
Decrease the Inverter capacity.
• The V/f setting is incorrect.
→
Reduce the V/f set voltage.
• The acceleration/deceleration time is too short.
→
Increase the acceleration/deceleration time.
• The ventilation is obstructed.
→
Change the location of the Inverter to meet the installation conditions.
• The cooling fan of the Inverter does not work.
→
Replace the cooling fan.
Probable cause and remedy
29