Yaskawa iQpump Drive User Manual - Manual (Page 138)

6.1 Fault Detection
138 YASKAWA TM.iQp.01 iQpump Drive User Manual
LF
Output Phase Loss
Output Open-phase
An open-phase occurred at the iQpump output.
This fault is detected when output current has
exceeded 5% imbalance.
There is a broken wire in the output
cable.
There is a broken wire in the motor
winding.
The output terminals were loose.
Check the wiring to the motor.
Check the motor for phase-to-ground
short.
The motor being used has a
capacity less than 5% of the
iQpump’s maximum motor
capacity.
Check the motor and iQpump capacity.
Low impedance motor was used. Add additional impedance.
Parameter E2-03 set incorrectly. Adjust E2-03 to a lower value.
LL3
Loss of Load Det 1
Loss of Load Detection 1
iQpump output current < L6-02 for more than the
time set in L6-03.
Motor is underloaded.
Ensure the values in L6-02 and L6-03
are appropriate.
Check application/machine status to
eliminate fault.
OC
Over Current
Overcurrent
iQpump output current exceeded the overcurrent
detection level (approximately 180% of iQpump
rated output current).
Shorted iQpump output phase-to-
phase, shorted motor, locked rotor,
load too heavy, accel/decel time
too short, contactor on the iQpump
output is opened and closed, a
special motor or a motor with a
FLA rating larger than iQpump
rated output current.
Remove the motor and run the iQpump
without the motor.
Check the motor for a phase-to-phase
short.
Check the iQpump for a phase-to-phase
short at the output.
Verify C1-01 to C1-06 are set correctly.
Check load conditions.
OH1
Heatsink MAX
Temp
Cooling Fin/Cooling Fin Fan Overheat
The temperature of the iQpump cooling fin
exceeded the temperature programmed in
parameter L8-02, and L8-03 = 0-2.
Cooling fan(s) are not working,
high ambient temperature, a heat
source is too close to the iQpump.
Check for dirt build-up on the fans and
cooling fins.
Reduce the ambient temperature around
the iQpump.
iQpump Internal Cooling Fan.
Remove the heating unit/Replace the
cooling fan.
OH3
Motor Overheat 1
Motor Overheating Alarm
The iQpump 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 to
C1-06).
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 iQpump 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 to
C1-06).
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 C1-03 to C1-06.
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.
Digital
Operator Display
Description Cause Corrective Action