Yaskawa iQpump Manual Supplement - Manual (Page 13)

6 Feature Details - Low City Pressure Alarm
YASKAWA TM.iQp.10 iQpump Technical Manual Supplement 13
6 Feature Details - Low City Pressure Alarm
‹ Overview
The alarm function is used for stopping the iQpump Controller or preventing the iQpump Controller from running based
on an external contact closure.
This function has been enhanced by parameter P4-27 which allows users to select the alarm message that will be
displayed when a Low City Pressure condition is detected.
„ Function Operation
P4-27 Low City Pressure Alarm Text
Selects the alarm message that will be displayed when a Low City Pressure condition is detected.
Alarm: Low Pressure/Low Water in Tank
„ Related Parameters
P4-21 Low City Pressure Input Select
P4-22 Low City Pressure Input Delay Time
Multi-function Input Setting H1-††: Low City Pressure
Setting Description
0 Low City Pressure (factory default)
1 Low Suction Pressure
2 Low Water in Tank
Alarm Display Description
Low Suction Pressure
Shown when P4-27 = 1 and when the digital input has been active (closed for P4-21 = 0, or open for
P4-21 = 1) for the time set in P4-22. The drive, if running, coasts-to-stop and does not run until the digital
input has been inactive for the time set in P4-22.
Low Water In Tank
Shown when P4-27 = 2 and when the digital input has been active
(closed for P4-21 = 0, or open for P4-21 = 1) for the time set in P4-22. The drive, if running, coasts-to-stop
and does not run until the digital input has been inactive for the time set in P4-22.
Setting Description
0 Normally Open (closed for the "Low City Pressure" condition)
1 Normally Closed (open for the "Low City Pressure" condition) (factory default)
Range Description Default
1 - 1000 sec
Sets the amount of time a "Low City Pressure" condition must be present before
the drives will stop. Also sets the amount of time that the pressure must be
adequate before the drive system will restart.
10 sec
Setting Description
73 Low City Pressure
Indicates that sufficient/insufficient pressure is present on the inlet to the pump. This setting is used mainly
for pressure booster stations.