Xylem hydrovar - Page 64

P255 CONF.FMIN
f -> 0
Actual Value Output Freq.
Left fct. Up fct. Down fct. Right fct.
Possible settings are:
Setting Description
f -> 0 Once the required pressure is reached and no further
consumption is needed, the frequency goes down to the
selected P250 MIN.FREQ.: HYDROVAR will then keep
running for the selected P260 FMIN TIME and after this
time stops automatically.
f -> fmin With this setting the pump never stop automatically: the
frequency goes down to the selected P250 MIN.FREQ.. To
stop the pump the external ON/OFF must be opened or
the provided push button must be pressed.
NOTICE:
For circulation systems, the setting "f -> fmin" can overheat the pump in case there is no
flow through it!
P260 FMIN TIME
G
This parameter (default value 0 sec, possible setting 0-100 sec) sets the delay time before
a shut-off below P250 MIN.FREQ. occurs.
P260 FMIN TIME
0 sec
Actual Value Output Freq.
Left fct. Up fct. Down fct. Right fct.
It is used to prevent problems with a shut off of the pump at no demand (too small or no
pressure tank), as the system pressure increases during this delay time. This parameter is
only active if P255 CONF.FMIN is set to "f -> 0".
P261 SKIP FRQ.CTR.
G
This parameter (possible setting P250 MIN.FREQ. - P245 MAX.FREQ.) sets the skip
frequency center.
P261 SKIP FRQ.CTR.
20.0 Hz
Actual Value Output Freq.
Left fct. Up fct. Down fct. Right fct.
P262 SKIP FRQ.RNG.
G
This parameter (possible setting 0.0 - 5.0 Hz) sets the skip frequency range.
8 Programming
62 HVL 2.015-4.220 Installation, Operation, and Maintenance Manual