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Operation With Soft Start Unit; Operation With Frequency Converter (Inverter); Commissioning, Checking Operation; Measuring The Insulation Resistance - Biral SUB4X Montage- Und Betriebsanleitung

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5.3 Operation with soft start unit

With soft starting units one phase
is always connected through directly.
The submersible pump is suitable for operation
with a soft starting unit (soft starter).
The following conditions or limits must be observed:
– Starting voltage set: 220 V (55%) of UN 400 V
– Slope time: optimally 1 second
but a maximum of 3 seconds
– The soft starting control must be bypassed after
running up with a bypass contactor.

5.4 Operation with frequency converter (inverter)

Submersible pumps can be operated with frequency
converters if the following guidelines are observed.
Experience shows that it is advisable to make the
frequency converter one size too large. This permits
the following requirements to be reliably satisfied:
– The rated current must not be exceeded at rated
voltage and frequency.
– The operating frequency lies between 30 Hz
and rated frequency (50 Hz).
– The slope time from 0 Hz to 30 Hz
a maximum of 1 second
– The voltage rise - voltage peaks (dV/dt) should be
less than 500 V/Ìsec (EN 60034).
– A suitable sine-wave filter must be fitted
(note FU manufacturer data).
Alternatively, an inductor (LC filter)
may also be used
– Reduction of the nominal delivery to less
than 10% is not permitted.
– The thermal loading of the motor must be calculated
and monitored by the FC (ETR - Electronic Thermal
Relay) so that it does not overheat.
– Starting voltage, starting current and slope time
are given in the following table 1.
Table 1:
Shaft output
Soft-starting unit
P2 (motor)
frequency converter (FU)
V
min
S
[kW]
[%Vn]
0.37 to 5.5
60
7.5 to 37
45 to 59
66 to 92
70
110 to 170
190 to 370
V
= starting voltage
S
Vn = rated voltage
I
= starting current
S
IN = rated current
I
min
max.
S
slope time
[% In]
[s]
1
1.5
2
250
2.5
3
3.5

6. Commissioning, checking operation

Submersible pumps must never be
Warning
allowed to run dry!
The characteristic curve of the pump
must be observed. It will be destroyed
if the motor is overloaded.
The riser pipe (pressure pipe) should be
vented before putting into service to
avoid water hammer when running-up.

6.1 Measuring the insulation resistance

Measurement of insulation resistance determines
the resistance between all individual phases and earth.
For this test the motor must be electrically isolated
from the installation (disconnect underwater cable on
control side). The resistance between the individual
phases
and earth is measured with an ohmmeter or insulation
measuring set (test voltage 500 VDC).
Minimum value required:
– 0,5 MΩ (fitted in well)

6.2 Commissioning

Operation of the pump against a slide
Warning
valve throttled too much results in damage
to the axial bearing and overheating
of the motor due to insufficient cooling.
If the system counter-pressure is
inadequate (e.g. slide valve/control
element opened too far) the pump
is operated outside the characteristic
curve and the motor is overloaded
1.
Vent pipe and switch on pump with slide valve
practically closed (not with slide valve fully closed).
1.1 Allow a long pause between successive starts to
prevent the motor overheating. The maximum
number of starts per hour must not be exceeded.
Look for cause of fault
2.
Open slide valve slowly and regulate to operating
point specified. Check current consumption
with slide valve fully open. This must be less
than the rated current.

6.3 Checking direction of rotation

The direction of rotation cannot be
Warning
checked or determined from the current
consumption.
If the direction of rotation is wrong, the submersible
pump will never attain the correct hydraulic values.
The following procedure should be adopted to check
the direction of rotation:
1.
Measure the pressure against the closed slide valve.
(Caution: the pump should only be operated briefly
against the closed valve - 2 minutes maximum).
2.
Disconnect all poles of the mains voltage and
secure against re-connection. Change over 2 of
the 3 phases.
3.
Repeat point 1.
4.
The correct direction of rotation is that which
develops the higher pressure.
(Maximum pressure is equivalent to correct
direction of rotation!)
19

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