Xylem IM223 R04 Hydrovar Pump Control - Manual (Page 50)

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0245
0245 MAX. FRQ.
Maximum frequency
60 Hz
Possible settings: 30.0 – 70.0 Hz
This parameter determines the maximum frequency output to the motor. This should be set to the motor
nominal frequency. Default is 60 Hz.
settings higher than motor nominal frequency may overload the motor! settings of 10%
above nominal frequency increase power consumption by 33%
0250
0250 MIN. FRQ.
Minimum frequency
20.0 Hz
Possible settings: 0.0 – f
max
At operation below MIN. FREQUENCY (0250) the HYDROVAR operates with the fast ramps F
min
A and D,
(0235/0240).
the pump type and application should be considered when setting Min. FreQ. For
submersible applications the min. frequency must be set to ~30Hz.
0255
0255 CONF. F
MIN
Operation at minimum frequency
f -> 0
Possible settings: f->0 or f->f
min
f->0: After reaching the required pressure with no demand the frequency drops to the selected MINIMUM
FREQUENCY [0250] and the HYDROVAR will continue to run for the selected F
MIN
TIME [0260]. After this
time the HYDROVAR will stop automatically.
f->f
min
: The pump will never stop automatically. The frequency will only drop down to the selected MINI-
MUM FREQUENCY [0250]. To stop the pump the external ON/OFF (E-stop) must be opened or the ▼
(Stop) button must be pressed.
applications: circulation systems
caution: The setting f->f
min
can overheat the pump if there is no flow through the pump.
Use when there is a bypass line for circulation pumps!
0260
0260 F
MIN
TIME
Delay time before shut off below MIN. FREQ.
0 s
Possible settings: 0 – 100 sec
After running below MIN. FREQ.for this selected time, the pump will stop if parameter CONFIG. FMIN
[0255] is set to f -> 0.
0265
0265 BOOST
Motor starting voltage in % of connected supply voltage
5 %
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 startup as a percentage of the nominal voltage. This setting should be kept as low
as possible to protect the motor from thermal overload at lower frequencies. If the boost is set too low, a
failure (OVERLOAD) may occur because the starting current is too high.
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