Xylem IM223 R04 Hydrovar Pump Control - Manual (Page 57)

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calculations of the new required value for multi pump applications:
k ... number of active pumps (k >1)
p = p
set
+ (k-1)*[lift value – fall value]
• Lift value = Fall value ⇒ pressure constant independent of how many pumps are in operation
• Lift value > Fall value ⇒ pressure rises when assist pump switches on
• Lift value < Fall value ⇒ pressure falls when assist pump switches on
The following 3 parameters are responsible for starting the assist pumps and to calculate the new required
value.
0505
0505 ACT. VAL. INC.
Lift value
5 PSI
Possible settings: 0.00 – to the pre selected sensor range
0510
0510 ACT. VAL. DEC.
Drop value
2 PSI
Possible settings: 0.00– to the pre selected sensor range
0515
0515 ENABLE FRQ
Enable frequency for the next drive
48.0 Hz
Possible settings: 0.0 – 70.0 Hz
Sets the frequency for the next pump to turn on. If a pump in the system reaches this frequency and the
system pressure drops below the REQUIRED VALUE [02] - ACTUAL VALUE DECREASE [0510], the next
pump is started.
0520
0520 ENABLE DLY
Enable delay time (for cascade relay only!)
5 sec
Possible settings: 0 – 100 sec
Delay, in seconds, after the current pump reaches the enable frequency, before the next pump turns on.
0525
0525 SW DELAY
Switch delay (for cascade relay only!)
5 sec
Possible settings: 0 – 100 sec
Delay time between two switching actions of the fix speed pump. The parameter prevents the system re-
peated switching actions caused by varying demand.
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