Flowserve PLEUGER - Manual (Page 31)

PLEUGER STANDARD USER INSTRUCTIONS ENGLISH 71569293 01-13
Page 31 of 40
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7 COMMISSIONING, START-UP AND
SHUTDOWN
7.1 Commissioning
7.1.1 General notes
Due to the slender design of the submersible motors,
different current values can be measured in the
individual phases. This is especially true for two-pole
motors. These differences can be reinforced by
voltage differences between the phases already
present from the line side.
This effect can be reduced to a minimum by transposing
the line side phase connections in clockwise order.
Details concerning the electrical switchgear
must be taken from the Operating Instructions from
the control panel manufacturer.
For practical reasons, the pressure pipe downstream
of the slide valve is first closed when the pumped
water is free of sand and/or impurities.
7.1.2 First switching on
After the pump unit has been fully installed and all
pipelines have been connected upstream and
downstream as far as the control valve, the control
valve is closed except for a small gap for venting the
ascending pipeline. After this, the unit can be
switched on.
S-type pump units (pumps with axial
impellers) must never be started against a closed
slide valve. Overloading could then occur, with
consequent damage to the motor.
After switching on, the pressure at the manometer
must be greater than the head given in the data sheet
minus the water depth (W
t
).
If the pressure at the manometer is less than that given
in the data sheet, the drive is rotating in the wrong
direction. When the direction of rotation is incorrect, the
pump will have no or extremely reduced performance.
The unit must not be driven for longer
than three minutes in the wrong direction.
If incorrect rotation occurs, exchange two phases with
one another on the motor power cable in the control
panel.
Do not transpose anything on the star-
delta contactor combination.
Single-phase machines are wired within the motor so
that they have the correct rotation on every supply
system with the prescribed voltage when connected.
The direction of rotation on these machines cannot
be changed.
a) As the empty ascending pipeline is being filled,
the ammeter may show a higher current than in
the data sheet even after the switching-on current
has decayed during the initial switching-on.
b) After this the operational current must be lower
than the highest permissible current given in the
data sheet.
c) Open the slide valve slowly, so that the well is not
overloaded by too great a flow and sand is also not
swept up. Watch the current consumption of the
motor on the ammeter whilst opening the valve.
d) Slowly open the slide valve until the ammeter just
shows the operational current according to the
data sheet.
e) When the design operating point for the pump
unit has been reached, current consumption must
approximate with that given in the data sheet.
f) The fitting conditions and electrical connections
must be checked once again if this is not the case.
g) The pressure pipe can be connected if there are
no abnormalities during and after the test run, if
this has not yet been carried out.
7.2 Operation
After the unit has operated for a period of time, it is
possible that a minimal readjustment of the motor
circuit breaker may be required, due to changed
operating conditions, for example by the sinking of
the water level.
Do not select a motor protection
adjustment setting greater than the highest
permissible value given in the data sheet.
For monitoring the water level in the well and in the
header tank, we recommend water level detectors or
water level measuring units.
7.2.1 Starting frequency
The amount of regularly spaced starts per hour can
be found in the data sheet. More frequent starts are
only permissible if agreed with the manufacturer.
Table 7-1: Maximum number of permissible starts
in sequence
Cold motor 3 starts
Warm motor 2 starts
Resting time after each cycle 5 minutes
It is suggested that the motor is protected by a time
relay against unauthorised reconnection.