Pipe Connection; Inlet And Discharge Pipes; Electrical Connection; Motor Protection - Grundfos BME Montage- Und Betriebsanleitung

4. Pipe connection

4.1 Inlet and discharge pipes

The booster modules are fitted with clamp liners for Victaulic
clamp couplings on the inlet and discharge sides. Position the
clamp liners as shown in fig. 8.

Caution

Avoid any stress in the pipe system.
3.5 mm
Pipe system
Clamp liners
Fig. 8 Positioning of clamp liners

5. Electrical connection

Warning
Before starting work on the booster module,
make sure that the power supply has been
switched off and that it cannot be accidentally
switched on.
The booster module must be connected to an
external mains switch.
The booster module must be earthed.
The electrical connection must be carried out by an authorised
electrician in accordance with local regulations and the diagrams
for the motor protection, starter and monitoring devices used. See
fig. 9. The electrical connections are made in the terminal box.
95
A1
H1
H2
K
N
A2
98 96
S1
K1
Fig. 9 Wiring diagram
Booster module
N L1 L2 L3
FR
3UN2 100-0 C
T2 T1
K1
MV
M
3
The required voltage quality measured at the motor terminals is ±
5 % of the rated voltage during continuous operation.
There must be voltage symmetry, i.e. approximately same
difference of voltage between the individual phases. See section
22. Checking of motor and cable, point 1.
The motor is wound for star-delta starting.
The following starting methods can be used:
• star-delta starting
• soft starter
• frequency converter.
The maximum permissible run-up changeover time for star-delta
starting is 2 seconds for motors up to and including 90 kW and 4
seconds for motors of 110 to 160 kW.
When starting up via a soft starter or frequency converter, the
run-up time from 0 to 30 Hz should not exceed 6 seconds.
The run-out time from 30 to 0 Hz should not exceed 6 seconds.
During frequency converter operation, it is not advisable to run
the motor at a frequency higher than the rated frequency (50 or
60 Hz). See motor nameplate.

6. Motor protection

The motor must be connected to an effective motor starter (MV)
and an external amplifier relay (FR). See fig. 9. This protects the
motor against damage from voltage drop, phase failure, quick and
slow overloading and a locked rotor.
In power supply systems where undervoltage and variations in
phase symmetry may occur, a phase failure relay should be
connected. See section 22. Checking of motor and

6.1 Thermistor

Before starting up the system, the thermistors must be connected
to terminals T1 and T2 on the terminal block. See fig. 9. The
thermistors protect the motor windings against thermal overload.

6.2 Setting of motor starter

For cold motors, the tripping time for the motor starter must be
less than 10 seconds at 5 times the rated current of the motor.
To ensure the best protection of the motor, the setting of the
motor starter should be carried out as follows:
1. Set the starter overload to the rated current (I
2. Start the booster module and let it run for half an hour at
normal performance.
3. Slowly grade down the scale indicator until the motor starter
trips.
4. Increase the overload setting by 5 %, but not higher than the
rated current (I ).
1/1
For motors wound for star-delta starting, the starter overload unit
should be set as described above, but the maximum setting must
not exceed the following:
Starter overload setting = Rated current (I

6.3 Generator operation

Motor-driven generators for standard motors are often available
according to standard conditions, e.g.
• maximum height above sea level: 150 metres
• maximum air intake temperature: 30 °C
• maximum air humidity: 60 %.
cable.
) of the motor.
1/1
) x 0.58.
1/1
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