66
0255
0255 CONF. FMIN
f -> 0
Operation at Minimum Frequency
Possible settings: f->0 or f->f
min
f->0: After reaching the required pressure the frequency will go down to the selected
MINIMUM FREQUENCY [0250] and the HYDROVAR will keep running for the selected FMIN
TIME [0260]. After this time the HYDROVAR will stop automatically.
f->f
min
: With this setting the pump will never stop automatically. Only the frequency will
go down to the selected MINIMUM FREQUENCY [0250]. To stop the pump the External
ON/OFF must be opened or the ▼ button must be pressed.
Applications: circulation systems
The setting f->fmin can overheat the pump, when there is no flow through
the pump. => bypass line for circulation pumps!
0260
0260 FMIN TIME
0 s
Delay time to shut off below minimum frequency
Possible settings: 0 – 100 sec
After running the pump for this selected time at minimum frequency, the pump will stop, if
parameter CONFIG. FMIN [0255] is set to f -> 0
0265
0265 BOOST
5 %
Setting of the motor starting voltage in % of
connected supply voltage
Possible settings: 0 – 25% of the input voltage
This parameter determines the characteristics of the voltage/frequency curve.
In particular, it refers to the voltage increase during the motor starting stage as a
percentage of the nominal voltage. Take care that settings are kept as low as possible so
that the motor does not become thermally overloaded at lower frequencies.
If the boost is set too low, a failure (OVERLOAD) may occur because the starting-current is
too high.
NOTICE: Problems with shut off the pump at 0 demand (too small or no pressure
tank) may be solved as the system pressure is increasing during this delay-
time.
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