YASKAWA E7LVD002 Technical Manual page 182

Digital
Operator Display
Loss of Load Detection 1
LL3
Drive output current < L6-02 for more than
Loss of Load Det 1
the time set in L6-03
Overcurrent
OC
Drive output current exceeded the
Over Current
overcurrent detection level (approximately
180% of Drive rated output current).
Cooling Fin/Cooling Fin Fan Overheat
The temperature of the Drive cooling fin
OH1
exceeded the temperature programmed in
Heatsnk MAX Temp
parameter L8-02, and L8-03 = 0-2.
Drive Internal Cooling Fan
Motor Overheating Alarm
OH3
The Drive stops or continues operation
Motor Overheat 1
according to the setting of L1-03.
Motor Overheating Fault
OH4
The Drive stops operation according to the
Motor Overheat 2
setting of L1-04.
Motor Overload
OL1
Designed to protect the motor
Motor Overloaded
Fully adjustable from parameter E2-01
Table 6.3 Fault Displays and Processing (Continued)
Description
Diagnostic & Troubleshooting 6 - 10
Cause
Motor is underloaded.
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.
Cooling fan(s) are not
working, high ambient
temperature, a heat source is
too close to the Drive.
Overheating of motor as
measured by motor thermistor.
Overheating of motor as
measured by motor thermistor.
The load is too large. The
cycle time is too short at the
accel/decel time.
The voltage of the V/F pattern
is high.
Motor rated current setting is
improper.
Corrective Action
Ensure the values in L6-02 and
L6-03 are appropriate.
Check application/machine
status to eliminate fault.
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.
Check for dirt build-up on the
fans and cooling fins.
Reduce the ambient temperature
around the Drive.
Remove the heating unit. Replace
the cooling fan.
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).
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).
Recheck the cycle time and the
size of the load as well as the
times set in C1-01 and C1-02.
Review the V/F pattern
parameters, E1-01 thru E1-13.
Check the motor rated current
value in E2-01.