Yaskawa iQpump Drive User Manual - Manual (Page 128)

5.2 Pump Basic
128 YASKAWA TM.iQp.01 iQpump Drive User Manual
Example: 3600 RPM Pump Motor
Desired Operation: Minimum Speed is 2100 RPM
Solution: Program P1-06 to 35.0Hz (2100 ÷ 3600 x 60 Hz (E1-04) = 35.0 Hz)
Example: 1800 RPM Pump Motor
Desired Operation: Minimum Speed is 1000 RPM
Solution: Program P1-06 to 35.0Hz (1000 ÷ 1800 x 60 Hz (E1-04) = 33.3 Hz)
◆ P1 Loss of Prime Detection
<0032>
■ P1-12, P1-14
The Loss of prime function can be used to detect a pump system low suction condition. The iQpump Controller continuously monitors
pump motor current and output frequency while operating auto mode.
■ Enable Loss of Prime Function
Program P1-14 Prime Loss Level to low suction condition current level.
Guideline: Use 40% of the pump motor full load amp rating (Parameter E2-01)
■
Operation
If the iQpump Controllers’ output frequency is at maximum (Parameter E1-04) and the pump motor output current level drops below P1-
14 Prime Loss Level for the time programmed in P1-12 Not Maintaining Set Point and Loss of Prime the iQpump drive will fault and
display “LOP”.
Table 5.8
Note: Loss of prime function is only active when the maximum numbers of pumps defined by P1-01 are running at maximum
frequency.
Figure 5.50 Loss of Prime (LOP) Fault
Parameter
No.
Modbus
Address
Parameter Name
Digital Operator
Display
Description
Setting
Range
Factory
Setting
Menu
Location
Page
No.
P1-12

<0032>
0107H
Not Maintaining
Setpoint and Loss of
Prime Time
SetPoint-LOP Tim
Delay time before a Not Maintaining SetPoint or Loss of Prime Time
fault occurs. Pump protection criteria specified in P1-11 or P1-14
must be met for the Drive to fault. The Drive will coast to a stop
when a fault occurs. A value of 0 disables both Loss of Prime and
Not Maintaining SetPoint faults.
0 to 3600
sec
60 sec
Pump Quick
Setup
—
P1-14

0109H
Prime Loss Level
Prime Loss Level
Used to detect loss of prime in the pump. If output current drops
below this level for the time specified in P1-12 and the output
frequency is at fmax, a “Loss Of Prime” fault occurs. The Drive will
coast to a stop when a fault occurs.
0 to 1000.0
A
0.0 A
Pump Quick
Setup
—
 Denotes that parameter can be changed when the Drive is running.
-DRIVE-
Loss of Prime
LOP
U2-04 =
U2-05 = 0.00 Hz
0.00 A