Lorentz PSk3-7 User Manual

Pump Installation 5554 Pump Installation
EN EN
8.2.4 Preparing the installation
To lower the pumps into the borehole, a crane or
hoist is required. You also need two clamps and
ropes to lift components.
All parts have to be strong enough to withstand the
weight of the pump, the motor, the motor cable and
the pipe system.
It is also helpful to lower a pump dummy into the
borehole before you lower the pump to make sure
that the hole is completely free and the pump can
slide into the hole without obstructions.
l
WARNING – Before starting any work
on the pump/motor, make sure that
the electricity supply has been switched
o and that it cannot be accidentally
switched on!
WARNING – Never stand under
suspended loads.
a
CAUTION – Before starting the
assembly, make sure that all parts are
delivered and have not been damaged
during transport.
a
CAUTION – Pay attention to the label
on the motor if the liquid in the motor
need to be checked, lled up or if the
motor needs to get completely relled.
CAUTION – Be careful not to bend the
pump, take particular care with pumps
with higher numbers of stages. Make sure
that the pump never stands on the motor
cable, that the cable does not get jammed
or damaged by sharp ledges or that the
cable is not pulled or jerked where it
enters the motor.
Winding resistance
(1) Set the multimeter to “resistance measurement”
and select the lowest measuring range.
(2) All PSk3 motors are 3-phase motors. Measure
the resistance of phase-to-phase: 1-2, 2-3, 3-1.
Make sure there is good contact between the
probes and the cable.
(3) The deviation between the phases should be
within 10 %. If the deviation is too high, the
reason is likely a damaged submersible cable or
a faulty cable splice.
(4) The absolute value is made up of the resistance
of the motor winding and the submersible cable.
The resistance of the submersible cable depends
on its length and size. For copper cable, the
values of the table below, "Table 9: Motor cable
resistance" and "Table 10: Motor resistances for
submersible pump motors" on page 55 can be
used as approximation.
Table 9: Motor cable resistance
Cable
Resistance
[Ω / 100 m]
2.5 mm2 / 13 AWG 0.82
4 mm2 / 11 AWG 0.51
6 mm2 / 9 AWG 0.34
10 mm2 / 7 AWG 0.20
16 mm2 / 5 AWG 0.12
Example:
 Motor:
AC DRIVE SUB 6” 7.5 kW  1.8 Ω
 Motor cable:
150 m and 6 mm
2
 0.25 Ω / 100 m
Calculation of expected phase-to-phase
resistance:
= 1.8 Ω + 2 × 150 m × 0.25 Ω / 100 m
= 1.8 Ω + 2 × 0.375 Ω
= 1.8 Ω + 0.75 Ω
= 2.55 Ω
= ~ 2.6 Ω
The real measured values can be dierent,
depending on the measurement equipment
and materials that are used. This is just an
approximation.
Insulation resistance
Use a megohmmeter at 500 –1,000 V.
Measure each phase to ground. Connect one test
prod to the phase hold the other test prod to the
pipe work, or if plastic pipes are used to the ground
wire.
If the insulation resistance is below 0.5 MΩ ,the
motor cable must be checked for damage.
Table 10: Motor resistances for submersible pump
motors
Submersible Pump Motors PSk3 system
Phase-to-phase resistance
[Ω]
AC Drive Sub 6" 5.5 kW PSk3-7 2.4
AC Drive Sub 6" 11 kW PSk3-15 1.3

Lorentz PSk3-7 Specifications

General

Brand	Lorentz
Model	PSk3-7
Category	Inverter
Language	English