9. Troubleshooting and Maintenance
9-2
*1) It only comes under SV2800~3750iV5.
9.2 Monitoring Fault Condition
9.2.1 Monitoring fault display
Code LCD display Description
DIS_05 OC-U Current fault displayed. (U-phase overcurrent)
z 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].
IGBT Short
Arm Short-U
Arm Short-V
Arm Short-W
Inverter output is stopped when IGBT Arm short or output short occurs.
(Arm short-DB is only come under SV110~220iV5)
(SV2800~3750iV5 are displayed as ArmShort without reference to UVW phases.)
Fuse Open Fuse Open
he inverter turns off its output by opening the fuse when something is wrong with
the main circuit IGBT to protect the wiring from being damaged from short currents
Encoder Error Encoder Err
1) Displayed when Encoder signal fault occurs.(H/W)
2) Displayed when there is a discord of detection time standard of motor
error of PAR-14.(S/W)
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.
H/W Error
HW– Diag
Displayed when CPU has a problem, and then the inverter blocks the IGBT gating
signals.
FAN Lock
*1)
FAN Lock The inverter turns off its output when there is an Fan Lock.
Encoder
PowerError
*1)
Enc Power When there is an error in Encoder power source, the inverter turns off its output.
Displayed when Step-down transformer for power input of AC FAN or Input fuse of
transformer have an error. (AC input type 30 ~ 160 kW)
AC FAN and M/C
Poower
Error
FAN/
MC PWR
The inverter turns off its output to prevent from damage when AC220V is not
supplied to AC FAN and M/C. (DC input type 30 ~ 160 kW)
Displayed when Step-down transformer for power input of AC FAN or Input fuse of
transformer have an error. (AC input type 220 kW)
AC FAN
Power
Error
FAN PWR
The inverter turns off its output to prevent from damage when AC220V is not
supplied to AC FAN and M/C. (DC input type 220 kW)
Protective
function
Keypad display Description
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