Grundfos MS Series User Manual

English (GB)
9
To avoid damage to the pump part, make sure that
the motor stops when the pump flow falls below 10 %
of the rated flow.
Voltage peaks for Grundfos submersible motors
should be limited according to the table below.
5.2 Motor protection
5.2.1 Single-phase motors
Single-phase MS402 submersible motors
incorporate a thermal switch and require no
additional motor protection. As an exception, the
1,1 kW (1,5 hp) MS402 requires external current
protection.
Single-phase MS4000 / MS6000 submersible motors
are protected from overcurrent by a Grundfos starter
box.
5.2.2 Three-phase asynchronous motors
MS motors are available with or without a built-in
temperature transmitter.
Motors with a built-in and operational temperature
transmitter must be protected by:
• a motor-protective circuit breaker with thermal
relay or
• an MP 204 motor protection unit and
contactor(s).
Motors with or without a non-operational temperature
transmitter must be protected by:
• a motor-protective circuit breaker with thermal
relay or
• an MP 204 motor protection unit and
contactor(s).
MMS motors have no built-in temperature
transmitter. A Pt100 sensor is available as an
accessory.
Motors with a Pt100 sensor must be protected by the
following:
• a motor-protective circuit breaker with thermal
relay or
• an MP 204 motor protection unit and
contactor(s).
Motors without a Pt100 sensor must be protected by
the following:
• a motor-protective circuit breaker with thermal
relay with max. trip class 10 according to
IEC 60947-4-1 or
• an MP 204 motor protection unit and
contactor(s).
5.2.3 Three-phase synchronous motors
Synchronous MS motors are a part of an SPE Pump
system together with a suitable IPM-ready sine wave
output filter and a suitable CUE frequency converter.
The CUE has built-in motor protection.
Motor type
Max. Upeak
voltage
Max. dU/dt
MS402
650 V
phase-phase
2000 V/μs
MS4000
850 V
phase-phase
2000 V/μs
MS6000
850 V
phase-phase
2000 V/μs
MS6000P
850 V
phase-phase
2000 V/μs
MMS6
850 V
phase-ground
500 V/μs
MMS8000
850 V
phase-ground
500 V/μs
MMS10000
850 V
phase-ground
500 V/μs
MMS12000
850 V
phase-ground
500 V/μs
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
- The pump must be connected to
protective earth.
- 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
- When the motor has been thermally
switched off, the motor terminals are
still live. When the motor has cooled
sufficiently, it will restart automatically.

Grundfos MS Series Specifications

General

Brand	Grundfos
Model	MS Series
Category	Engine
Language	English