Yaskawa iQpump Controller Programming Manual - Manual (Page 205)

YASKAWA TM.iQp.07 iQpump Controller Programming Manual 205
◆ P4-21 Low City Pressure Input Select
<0034>
The Low City Pressure Input Select parameter prohibits the drive from running when low incoming pressure is indicated by a pressure
switch.
If the pressure switch is active (sufficient pressure available), the drive will operate normally. If the pressure switch indicates that
incoming pressure is to low:
• The lead drive will be forced into a sleep-like state (coast to stop).
• Any drives staged in multiplex mode will immediately be De-Staged (coast to stop).
• The alarm “Low City Pressure” will be displayed on the lead drive.
• The drive will restart but NOT perform a Pre-charge when sufficient pressure returns.
• The drive will start but WILL perform a Pre-charge if the Auto-Run command was given during the Low Pressure condition.
Figure 1.155
Figure 159. Low City Pressure Digital Input, Normally Closed (P4-21 = 1)
Table 81 Parameters
Table 82 Multi-Function Output Setting <0034>
Table 83 Alarms <0034>
Setting Description
0 Normally Open (closed indicates the “Low City Pressure” condition)
1 Normally Closed (open indicates the “Low City Pressure” condition)
Parameter
No.
Addr.
Hex
Parameter Name
Digital Operator Display
Description Range Default
Menu
Location
P4-21

834
Low City Pressure Input Select
Low City In Sel
Selects the type of pressure switch connected to the “Low City Press”
digital input (H1-0x = 73).
0: Normally Open (closed indicates the “Low City Pressure”
condition).
1: Normally Closed (open indicates the “Low City Pressure”
condition).
0 ~ 1 1 Programming
P4-22

8356
Low City Pressure Input Delay
Low City Delay
Sets the amount of time a “Low City Pressure” condition needs to be
present before the drives will stop. Also sets the amount of time that
the pressure needs to be adequate before the drive system will re-
start.
1 ~ 1000 s 10 Programming
 Denotes that parameter can be changed when the drive is running.
Setting Description
73
Low City Press
Indicates that sufficient / insufficient pressure is present on the inlet to the pump. Used mainly for pressure booster stations.
Alarm Display Description
Low City Pressure
Insufficient pressure is present on the inlet to the pump. Used mainly for pressure booster stations. Uses the “Low City Pressure”
digital input (H1-0x = 73) and parameters P4-21 and P4-22.
Low City Pressure
(H1-01 = 73)
P4-22
Low City Delay
Low City Pressure
Message
P4-22
Low City Delay
P4-22
Low City Delay
P4-22
Low City Delay
Output
Frequency Thrust Bearing