Xylem HYDROVAR HV 4.150 / 4.185 / 4.220 - Manual (Page 69)

69
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.
0260
0260 FMIN TIME
0 s
Delay time before shut off below MIN. FREQ.
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.
0270
0270 KNEE FRQ.
50.0 Hz
Knee frequency
Possible settings: 30.0 – 90.0 Hz
With this parameter you can set the frequency, at which the HYDROVAR should generate
its maximum output voltage (=value of connected input voltage).
For standard applications this frequency should be set according the MAX. FRQ. [0245]
(Default Setting 50Hz).
Be careful: This parameter should be used for special applications only!
Incorrect setting can cause an overload error and even a damage of the
motor.
Applications: circulation systems
The setting f->f
min
can overheat the pump, when there is no flow through
the pump => bypass line for circulation pumps!
NOTE: Problems with shut off the pump at no demand (too small or no pressure
tank) may be solved as the system pressure is increasing during this delay-
time.
G
G
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