Grundfos AC 15 Montage- Und Betriebsanleitung Seite 8

6. Electrical installation
Warning
The electrical connection must be
carried out in accordance with local
regulations.
Before starting work on the pump,
make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
The pump must be connected to an
external mains switch with a contact
gap of at least 3 mm in all poles.
Check that the mains voltage and frequency
correspond to the values on the nameplate.
6.1 Motor protection
The motor must be connected to a motor-protective
circuit breaker which can be manually reset. Set the
motor-protective circuit breaker according to the
rated current of the motor (I
6.2 Electrical connection
Carry out the electrical connection as shown in the
diagram inside the terminal box cover.
Wiring diagram
Fig. 3
6.3 Frequency converter operation
All three-phase motors can be connected to a
frequency converter. A recommended range of
operation with the standard motor fitted to the
AC pump is between 30 and 50 Hz, i.e. between
60 and 100 % of the rated speed.
Maximum cable length between the motor and the
frequency converter is 5 metres.
Depending on the frequency converter type,
increased acoustic noise from the motor may occur.
Furthermore, it may cause the motor to be exposed
to detrimental voltage peaks.
The above disturbances, i.e. both increased acoustic
noise and detrimental voltage peaks, can be
eliminated by fitting an LC filter between the
frequency converter and the motor.
For further information, please contact the frequency
converter supplier or Grundfos.
8
). See nameplate.
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7. Start-up
Do not start the pump until it has been
Caution
filled with liquid.
7.1 Liquid filling
Warning
The system may be under pressure,
and the escaping liquid may be
scalding hot. Care must therefore be
taken to ensure that the liquid does not
cause personal injury or damage to
other components.
1. Close the isolating valve on the discharge side of
the pump.
2. Open the isolating valve in the suction pipe
completely before starting the pump.
3. Remove the filling plug. See fig. 4.
4. Fill the pump housing and the suction pipe
completely with liquid until a steady stream of
liquid runs out of the filling hole.
5. Fit and tighten the filling plug.
6. Slowly open the discharge isolating valve while
the pump is running. This ensures venting and
pressure build-up during start-up.
The discharge valve must be opened
immediately after start-up of the pump.
Otherwise the temperature of the
Caution
pumped liquid may become too high
and cause material damage.
Filling plug
Drain plug
Plugs in the pump housing
Fig. 4
If it is difficult for the pump to build up
pressure, it may be necessary to repeat
Note
steps 1 to 6.