Yaskawa P7B Drive Bypass - Manual (Page 187)

Diagnostic & Troubleshooting 6 - 7
OC
Over Current
Overcurrent
Drive output current exceeded the
overcurrent detection level (approximately
180% of Drive rated output current).
Shorted Drive output phase to
phase, shorted motor, locked
rotor, load too heavy, accel/
decel time too short, contactor
on the Drive output is opened
and closed, a special motor or
a motor with a FLA rating
larger than Drive rated output
current.
Remove the motor and run the
Drive without the motor.
Check the motor for a phase-to-
phase short.
Check the Drive for a phase-to-
phase short at the output.
Verify C1-01 and C1-02 are set
correctly.
Check load conditions.
OH1
Heatsnk MAX Temp
Cooling Fin/Cooling Fin Fan Overheat
The temperature of the Drive cooling fin
exceeded the temperature programmed in
parameter L8-02.
Cooling fan(s) are not
working, high ambient
temperature, a heat source is
too close to the Drive.
Check for dirt build-up on the
fans and cooling fins.
Reduce the ambient temperature
around the Drive.
Drive Internal Cooling Fan Remove the heating unit.
OH3
Motor Overheat 1
Motor Overheating Alarm
The Drive stops or continues operation
according to the setting of L1-03.
Overheating of motor as
measured by motor thermistor.
Recheck the cycle time and the
size of the load.
Recheck the accel/decel time
(C1-01 and C1-02).
Recheck the V/F pattern (E1-01
thru E1-13).
Recheck the motor rated current
value (E2-01).
OH4
Motor Overheat 2
Motor Overheating Fault
The Drive stops operation according to the
setting of L1-04.
Overheating of motor as
measured by motor thermistor.
Recheck the cycle time and the
size of the load.
Recheck the accel/decel time
(C1-01 and C1-02).
Recheck the V/F pattern (E1-01
thru E1-13).
Recheck the motor rated current
value (E2-01).
OL1
Motor Overloaded
Motor Overload
Designed to protect the motor
Fully adjustable from parameter E2-01
The load is too large. The
cycle time is too short at the
accel/decel time. Recheck the cycle time and the
size of the load as well as the
times set in C1-01 and C1-02.
The voltage of the V/F pattern
is high. Review the V/F pattern
parameters, E1-01 thru E1-13.
Motor rated current setting is
improper. Check the motor rated current
value in E2-01.
OL2
Inv Overloaded
Drive Overload
Designed to protect the Drive
The load is too large. The
cycle time is too short at the
accel/decel time. Recheck the cycle time and the
size of the load as well as the
times set in C1-01 and C1-02.
The voltage of the V/F pattern
is high. Review the V/F pattern
parameters, E1-01 thru E1-13.
The size of the Drive is small. Change to a larger size Drive.
Table 6.1 Fault Displays and Processing
Digital
Operator Display
Description Cause Corrective Action