Yaskawa iQpump Controller User Manual - Manual (Page 129)

5.2 Pump Basic
YASKAWA TM.iQp.06 iQpump Controller User Manual 129
Example: 3600 rpm Pump Motor
Desired Operation: Minimum Speed is 2400 rpm
Solution: Program P1-06 to 40.0 Hz (2400 ÷ 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 33.3 Hz (1000 ÷ 1800 x 60 Hz (E1-04) = 33.3 Hz)
◆ P1 Loss of Prime Detection
<0032>
■ P1-14, P1-16
The Loss of Prime function can be used to detect a pump system low suction condition. The iQpump drive 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 drives’ 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 P1-16 Loss of Prime Time the iQpump drive will fault and display “LOP”.
Prime Loss Time: The “Prime Loss” detection is no longer controlled by parameter P1-12. Instead it is controlled by a new parameter, P1-
16. Also, the “Prime Loss” detection is enabled during the pre-charge function, but only when not ramping (output frequency = pre-
charge frequency).
• Parameter P1-16 is used as the “Loss of Prime” fault timer.
• Parameter P1-16 should be enabled when in pre-charge, but only when the output frequency is within 1 Hz of the pre-charge frequency.
• Loss of Prime Detection is allowed when output frequency is within 1 Hz of d2-01 value instead of the fmax value.
• Loss of Prime Detection is allowed regardless of how many pumps are staged (contactor multiplex operation).
• Loss of Prime is enabled during Timed Run and Run / Stop Control.
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.
Address
Hex
Parameter Name
Digital Operator
Display
Description Range Default
Menu
Location
P1-14

0109
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 ~
1000.0 A
0.0 A Programming
P1-16

<0034>
87F
Loss of Prime Time
Prime Loss Time
Delay time before a Loss of Prime fault occurs. Pump protection criteria
specified P1-14 must be met for the drive to fault. On fault the drive will
coast to a stop.
1 ~ 600 s 20 s Programming
 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