Yaskawa iQpump Controller User Manual - Manual (Page 130)

5.2 Pump Basic
130 YASKAWA TM.iQp.06 iQpump Controller User Manual
Figure 5.34
Figure 5.51 Loss of Prime (LOP) Fault
Note: Loss of prime function is only active when the maximum number of pumps defined by P1-01 running at maximum
frequency. Loss of prime function is only active in auto mode.
Fault Display Description Cause Countermeasures
LOP
Loss of Prime
Loss of Prime Fault-
Pump has lost its prime.
If the output current drops below the P1-14 Prime Loss Level for
the time specified in P1-16 and the output frequency is at a high
enough level, a “Loss of Prime” fault occurs
Possible causes:
Dry Well, Air in System, No Water
Allow the system to pump water
again (must have resistance in
pump).
P1-14
Time
OUTPUT
CURRENT
LOSS OF PRIME
(LOP) FAULT
P1-16
<0034>
LOSS OF PRIME TIME
Fmax
– 1Hz
OUTPUT
FREQUENCY