Chapter 8 Troubleshooting & Maintenances
8-2
Protective
function
Keypad
display
Description
BX protection
(Instant Cut Off)
BX
Used for the emergency stop of the inverter. The inverter instantly turns off the
output when the BX terminal is turned ON, and returns to regular operation
when the BX terminal is turned OFF. Take caution when using this function.
Motor overspeed Over Speed Displayed when motor rotates over 120% its rated speed.
Communication
Error
COM Error
CPU Error
This fault is displayed when the inverter cannot communicate with the keypad.
Magnetic detect
error
Mag Det Err
Displayed when there are problem with initial magnetic detection of Permanent
magnet motor.
Speed drift error Spd Dev Err
This error is displayed when there is a difference between above a prescribed
value command speed and real speed.
8.2 Checking fault status and history
8.2.1 Monitoring current faults
Code
Keypad display
Description
DIS_05
OC-U
Current fault displayed. (U-phase overcurrent)
Check the current fault display before pressing reset key. pressing [PROG] key and [
▲
(Up)],[
▼
(Down)]
shows operating status at the time of the fault such as output frequency, current, voltage, F/B value, torque
current reference/actual value, dc link voltage, input/output terminal status, operating status and run time)
and the fault contents. Press [ENT] key to exit. Pressing [RESET] key will store the value in DIS_05 [Last
Fault1].
8.2.2 Monitoring previous faults
Previous 2 faults are saved in DIS_05 “Last fault 1/2“. Last fault 1 is more recent fault than Last fault 2.
Refer to “8.2.1 monitoring fault display” to check the fault contents.
Code
Keypad display
Description
DIS_05
Last Fault1
Previous fault 1
DIS_05
Last Fault2
Previous fault 2
DIS_05 “ Fault Clear” is the function to remove Last Fault1, Last Fault2 data. It is displayed as default
.
8.3 Inverter reset