Yaskawa iQpump Programming Manual - Manual (Page 127)

YASKAWA TM.iQp.02 iQpump Drive Programming Manual 127
■
P1-12 Not Maintaining Setpoint and Loss of Prime Time
<0032>
Setting Range: 0 to 3600 sec
Factory Default: 60 sec
The iQpump drive can be configured to display a Not Maintaining Setpoint (P1-11) fault when the difference between the setpoint and
the feedback levels are exceeded for the time programmed in the Not Maintaining Setpoint and Loss of Prime Time (P1-12). The drive
will coast to a stop after the level has been exceeded for the specified time programmed in P1-12.
This function is only active during operation in the Auto Mode.
The Not Maintaining Setpoint and Loss of Prime Time (P1-12) is also used for the Prime Loss Level (P1-14) function. Refer to Prime
Loss Level (P1-14) for further description.
The Not Maintaining Setpoint and Loss of Prime Time (P1-12) works in conjunction with Maximum Setpoint Difference (P1-11) and
Prime Loss Level (P1-14).
Note: The time value programmed into P1-12 is shared by Maximum Setpoint Difference (P1-11) and Prime Loss Level (P1-
14) functions. However, independent times are maintained. If one function time; such as P1-11, has elapsed, the other
functions time (P1-14) is still maintained until this time has elapsed.
■
P1-13 Hysteresis Level
Setting Range: 0.0 to 100.0
Factory Default: 0.0
The iQpump drive can be configured to detect Low Feedback Level (P1-07) and High Feedback Level (P1-09) alarms. The Hysteresis
Level (P1-13) is used to provide a bandwidth before the drive returns to normal operation. The Hysteresis Level is used to prevent rapid
cycling between alarm and normal operations.
The Hysteresis Level (P1-13) works in conjunction with the Low Feedback Level (P1-07) and High Feedback Level (P1-09) functions.
The units for this parameter are determined by the System Units (P1-02).
■
P1-14 Prime Loss Level
Setting Range: 0.0 to 1000.0 A
Factory Default: 0.0 A
The iQpump drive can be configured to detect a “loss of prime” in the pump. This drive will display a “LOP” fault when the output
current drops below the Prime Loss Level (P1-14) for the time programmed in the Not Maintaining Setpoint and Loss of Prime Time (P1-
12), and the output frequency is at maximum output frequency. The drive will coast to a stop when a fault occurs.
This function is only active during operation in the Auto Mode.
Note: The Prime Loss Level function is only active when the maximum numbers of pumps defined by P1-01 are running at
maximum frequency.
The Prime Loss Level (P1-14) works in conjunction with Not Maintaining Setpoint and Loss of Prime Time (P1-12).