Grundfos MMS 10000, Installation And Operating Instructions Manual, Page: 22 / 32

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11. Checking the motor and cable
11.1 MS6000P
The following warning is only valid for MS6000P/SPE
pump sets.
IIf a flow of water unintendedly goes through a non-
energized pump there is a risk that the moving parts
of the pump and the motor will start rotating, thereby
generating voltage over the terminals. The size of
the voltage depends on the speed of rotation.
Consequently, the motor terminals must be
considered as live until proven otherwise.
DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply before
starting any work on the product.
- Make sure that the power supply cannot
be accidentally switched on.
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that motor cable ends are
not live.
- Make sure that the power supply cannot
be accidentally switched on.
1. Supply voltage
TM
00
13
7
1
50
92
Measure the voltage
between the phases by a
voltmeter. On single-phase
motors, complete
measurement between
phase and neutral or
between two phases,
depending on the type of
supply. Connect the
voltmeter to the terminals in
the motor-protective circuit
breaker.
For the MS6000P, the supply
voltage must be measured
between the sine wave filter
and the motor.
When the motor is loaded, the voltage should be
within the range specified in section
5.1 General .
The motor may burn if there are larger variations in
voltage. Large variations in voltage indicate poor
power supply, and the motor must be stopped until
the defect has been corrected.