Yaskawa P7 Drive User Manual - Manual (Page 149)

Diagnostic & Troubleshooting 6 - 5
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
OL3
Overtorque Det 1
Overtorque Detection 1
Drive output current > L6-02 for more than
the time set in L6-03
Motor is overloaded
Ensure the values in L6-02 and
L6-03 are appropriate
Check application/machine
status to eliminate fault
Table 6.1 Fault Displays and Processing
Digital
Operator Display
Description Cause Corrective Action