English (GB)
14
5.6.9 Frequency converter
Three-phase MS submersible motors can be
connected to a frequency converter.
Permissible frequency ranges: 30-50 Hz and
30-60 Hz.
Ramp times: Maximum 3 seconds for start and stop.
Depending on the type, the frequency converter may
cause increased acoustic noise from the motor.
Furthermore, it may expose the motor to detrimental
voltage peaks. This can be compensated by
installing an LC filter or even better a sinus filter
between the frequency converter and the motor.
For further details, please contact your frequency
converter supplier or Grundfos.
6. Motor installation
7. Fitting the pump to the motor
1. Use pipe clamps when handling the motor.
2. Place the motor in vertical position at the
borehole. See fig. 15.
Fig. 15 Motor in vertical position
3. Lift the pump part by means of pipe clamps fitted
to the riser pipe. See fig. 16.
Fig. 16 Lifting the pump into position
4. Place the pump part on top of the motor.
5. Fit and cross-tighten the nuts to the torques
stated below.
To enable monitoring of the motor
temperature, Grundfos recommends
installing a Pt100 sensor together with a
PR 5714 relay.
Warning
Before starting work on the product, switch
off the power supply. Make sure that the
power supply cannot be accidentally
switched on.
Warning
When the motor is to be assembled with
the pump at the borehole, make sure to
use suitable pipe clamps.
TM00 5259 2402
TM02 5263 2502
Make sure that the coupling between the
pump and motor engages properly.
Pump/motor bolt diameter
Torque
[Nm]
5/16 UNF 18
1/2 UNF 50
M8 18
M12 70
M16 150
M20 280
www.motralec.com / service-commercial@motralec.com / 01.39.97.65.10
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