Xylem hydrovar, Инструкция по установке, эксплуатации и обслуживанию

Страница: 79 / 116

It is used to prevent the system from pressure hammers. Before the MASTER starts a new
assist pump, it drops to this frequency and then (when the frequency is reached) the assist
pump is started; at that point the MASTER Inverter returns to normal operation.
P545 OVERVALUE
This parameter only applies to cascade relay!
P545 OVERVALUE
OFF
Actual Value Output Freq.
Left fct. Up fct. Down fct. Right fct.
This parameter prevents the system against overpressure in case the HYDROVAR has
been parameterized incorrectly: if this selected value is reached, an immediate shut-off of
the follow-up-pumps is executed.
Possible settings are "Off" (default) or P420 SENSOR RANGE.
P550 OVERVAL.DLY.
This parameter only applies to cascade relay!
P550 OVERVAL.DLY.
0.0 sec
Actual Value Output Freq.
Left fct. Up fct. Down fct. Right fct.
This parameter sets the delay time to switch off an assist pump in case the actual value
exceeds P545 OVERVALUE limit.
P555 SWITCH INTV.
G
This parameter only applies to cascade serial and synchronous!
P555 SWITCH INTV.
24 hours
Actual Value Output Freq.
Left fct. Up fct. Down fct. Right fct.
This parameter sets the switch interval for the cyclic change-over: it allows an automatic
change-over of the MASTER pump and the assist pumps.
As soon as the switch time is reached the next pump becomes MASTER and the counter
restarts; this gives even wear and similar operating hours to all pumps. The switch interval
is active as long as the MASTER does not stop.
For information about how to find the correct setting, see
Example: P500 SUBMENU
SEQUENCE CNTR. (page 104).
P560 SYNCHR.LIM.
G
This parameter only applies to cascade synchronous!
8 Programming
HVL 2.015-4.220 Installation, Operation, and Maintenance Manual 77