Flowserve PLEUGER - Manual (Page 33)

PLEUGER STANDARD USER INSTRUCTIONS ENGLISH 71569293 01-13
Page 33 of 40
flowserve.com
8.3.2 Motors with one power supply cable
The cable conductors become
charged with the test voltage while measuring the
blank ends of the power cable and they must
therefore be insulated.
Only one lead must be measured to earth as all other
leads are internally connected.
8.3.3 Motors with two power supply cables
The cable conductors become
charged with the test voltage while measuring the
blank ends of the power cable and they must
therefore be insulated.
The following insulating measurements of the winding
and power cables are possible, depending on the
internal motor connections:

two cables on open phase connection -
measurement to be taken between each core of
the cable and earth

two parallel cables with internal star connection
- measurement to be taken between one core and
earth

two parallel cables with individual coil systems
(star or delta connection) - measurement to be
taken between one core of each system and earth
8.3.4 Checking insulation resistance of PT100
(RTD)
All cores of the temperature sensors PT100 (RTD)
have to be connected together to check the insulation
resistance. The motor, together with its installed one
or two PT100 (RTD) sensors and the signal cable,
need to be submerged in water.
The testing voltage must not be higher than 500 volts.
The insulation resistance of a new unit should be at
least 250 M
Ω.
The critical insulation resistance, after a long time in
service should be at least 0.25 M
Ω.
The insulation resistance values apply for an ambient
temperature of 40 °C (104 °F). At lower values the
connection between the PT100 and the signal cable
must be separated and the measurements retaken.
8.3.5 Continuity check
The continuity check must be carried out with a
resistance measurement bridge at a voltage not
higher than 5 volts.
To check the correct temperature values of the PT100
(RTD) the ambient temperature must be known.
When units are installed it is possible to test the
PT100 (RTD) provided the exact temperature of the
well water is known.
8.3.5.1 One temperature sensor
Carry out the three measurements in table 8-1:
Table 8-1
Measurement Colour code
1 white – red 1
2 white – red 2
3 red 1 – red 2
The difference between the readings of measurements
1 and 3 or 2 and 3 is the resistance of the RTD (PT100).
These values should be compared with table 8-3.
8.3.5.2 Two temperature sensors
Carry out the six measurements in table 8-2:
Table 8-2
Measurement Colour code PT 100
1 white 1 – red 1
No. 1 2 white 1 – red 2
3 red 1 – red 2
4 white 2 – red 3
No. 2 5 white 2 – red 4
6 red 3 – red 4
The difference between the readings of measurements
1 (4) and 3 (6) or 2 (5) and 3 (6) is the resistance of the
RTD (PT100) No.1 (No. 2).
These values should be compared with table 8-3.
8.4 Removal of the pump unit
When lifting the pump to withdraw it, take account of
the pump weight plus the weight of the water column
contained within the riser pipe if the pump unit does
not have a check valve with drain holes. (If the check
valve does have drain holes the weight of the water
column is not applicable.)
8.5 Overhaul of the pump unit
The structural design of a submersible pump unit
makes assembly and disassembly possible using
simple tools.
In case of removal, installation instructions specific to
the unit can be requested from the manufacturer. It is
recommended, however, that the unit is examined by
Flowserve technicians or that it is overhauled at a
Flowserve authorized service depot.