Xylem HYDROVAR HV 4.150 / 4.185 / 4.220 User Manual
Page 79
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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
5 sec
Disable delay time (for cascade relay only!)
Possible settings:
0 – 100 sec
Delay time before switching off the assist up pumps in cascade relay mode.
0540
0540 DROP FRQ
42 Hz
Drop frequency (for cascade relay only!)
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
OFF
Overvalue (for cascade relay only!)
Possible settings:
OFF – pre selected sensor range
If this selected value is reached, an immediate shut-off of the follow-up-pumps is executed.
E.g. REQUIRED VALUE [02]:
5.00 bar
OVERVALUE
[0545]:
7.50
bar
If three pumps are running (1 MASTER Inverter + 2 follow-up-pumps) and a system
pressure of 7.50 bar 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
0 sec
Overvalue delay (for cascade relay only!)
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.
S
S
S
S