Xylem IM223 R04 Hydrovar Pump Control - Manual (Page 58)

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0530
0530 DISABLE FRQ
Disable frequency (for cascade relay only!)
30 Hz
Possible settings: 0.0 – 120.0 Hz
The frequency to switch off the fixed speed pumps in cascade relay-mode.
If the Master Inverter goes below that frequency for longer than the pre-selected DISABLE DLY [0535] and
the system pressure is higher than the EFFECTIVE REQ. VALUE [03] (REQUIRED VALUE [02] + ACTUAL VAL.
INC [0505]), the first assist pump stops.
0535
0535 DISABLE DLY
Disable delay time (for cascade relay only!)
5 sec
Possible settings: 0 – 100 sec
Delay time before switching off the assist pumps in cascade relay mode.
0540
0540 DROP FRQ
Drop frequency (for cascade relay only!)
42 Hz
Possible settings: 0.0 – 70.0 Hz
This parameter is used to prevent the system from pressure hammers. Before a following pump starts up,
the Master Inverter will drop to the selected frequency. If the DROP FREQUENCY is reached, the follow-up-
pump gets released and the Master Inverter will continue with normal operation.
0545
0545 OVERVALUE
Overvalue (for cascade relay only!)
OFF
Possible settings: OFF – pre selected sensor range
If this selected value is reached, an immediate shut-off of the fixed speed pumps is executed.
E.g.
REQUIRED VALUE [02]: 70 PSI
OVERVALUE [0545]: 100 PSI
If three pumps are running (1 Master Inverter + 2 fixed speed pumps) and a system pressure of 100 PSI is
reached, one after another assist pump is switched off.
This parameter prevents the system against overpressure in case the HYDROVAR has been parameterized
incorrectly.
0550
0550 OVERVAL DLY
Overvalue delay (for cascade relay only!)
0 sec
Possible settings: 0.0 – 10.0 sec
Delay time to switch off an assist pump in case the actual value exceeds the OVERVALUE [0545] limit.
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