Yaskawa iQpump Drive User Manual - Manual (Page 144)

6.3 Alarm Detection
144 YASKAWA TM.iQp.01 iQpump Drive User Manual
LL3
Loss of Load Det 1
(Flashing)
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.
OH
Heatsnk Overtemp
(Flashing)
Cooling Fin/Cooling Fin Fan Overheat
The temperature of the iQpump cooling fin
exceeded the temperature programmed in
parameter L8-02.
Cooling fan(s) are not working, high
ambient temperature, a heating unit in
close proximity to iQpump is present.
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.
OH2
Over Heat 2
(Flashing)
iQpump overheat pre-alarm signal is input from a
multi-function digital input terminal.
An external overheat condition exists
connected to one of the multi-function
input terminals S3, S4, S5, S6 or S7.
Check for an external condition.
Verify the program parameters
H1-01 thru H1-05.
OH3
Motor Overheat 1
(Flashing)
Motor Overheating Alarm
The iQpump stops or continues operation
according to the setting of L1-03.
Overheating of motor.
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).
Check the digital operator
connector.
Verify the setting of o2-06.
OV
DC Bus Overvolt
(Flashing)
DC Bus Overvoltage
208-240 VAC: Trip point is ≥ 400 Vdc.
480 VAC: Trip point is ≥ 800 Vdc.
High input voltage at R/L1, S/L2 and
T/L3.
Check the input circuit and reduce
the input power to within
specifications.
Extend the time in C1-02, C1-04,
or C1-06.
The deceleration time is set too short.
Power factor correction capacitors are
being used on the input to the
iQpump.
Remove the power factor
correction capacitors.
PRHT
Motor Preheating
Motor Preheating
Motor is preheating.
Motor Preheat 2 input is closed. —
UV
DC Bus Undervolt
(Flashing)
DC Bus Undervoltage
The DC bus voltage is ≤ L2-05.
208-240 VAC: Trip point is ≤ 190 Vdc.
480 VAC: Trip point is ≤ 380 Vdc.
Low input voltage at R/L1, S/L2 and
T/L3.
Check the input circuit and
increase the input power to within
specifications.
The acceleration time is set too short. Extend the time in C1-01,
C1-03, or C1-05.
Voltage fluctuation of the input power
is too large.
Check the input voltage.
UV2
CTL PS Undervolt
Control Power Supply Undervoltage of the control
circuit when running. External load connected pulling down
the iQpump power supplies.
Cycle power off and on to the
iQpump.
Repair or replace the Power PCB/
Gate iQpump PCB.
UV3
MC Answerback
Soft Charge Circuit Fault
The pre-charge contactor opened while the iQpump
was running.
Contacts on the soft charge contactor
are dirty and the soft charge contactor
does not function mechanically.
Cycle power off and on to the
iQpump.
Check the condition of the soft
charge contactor.
Digital
Operator Display
Description Cause Corrective Action