Electrical Connection; Generator Or Inverter - Grundfos MQ-Serie Montage- Und Betriebsanleitung

The pump incorporates a non-return valve which
prevents backflow during priming and operation.
Installations with long suction pipes: A non-return
valve is supplied with the pump. We recommend to
fit this non-return valve in the pump suction port.
If the pump is installed in long pipes, the pipes must
be adequately supported on either side of the pump
in order not to strain the pump connections. If the
pump draws water from a well, we recommend also
to fit a foot valve to the end of the suction pipe.
See fig. 7.
Foot valve
Fig. 7 Suction pipes connected to a well
If a hose is used for suction pipe, it must be of a
non-collapsible type.
As the pump is self-cooling, no space is required
around the pump and no ventilation is required.

6.2 Electrical connection

The electrical connections and additional protection
should be carried out by qualified persons in
accordance with local regulations.
Warning
Never make any connections in the
pump terminal box unless the power
supply has been switched off for at
least 5 minutes.
The pump must be earthed (PE).
Do not start the pump until it has been
filled with water (primed).
The operating voltage and frequency are marked on
the nameplate. Make sure that the motor is suitable
for the power supply on which it will be used.
The pump must be connected to the mains via a
rubber-sheathed cable with a protective earth lead.
It is possible to replace the mains supply cable.
See fig. 8.
Fig. 8 Electrical connection
Connect the mains supply cable of the pump to the
power supply. When the cable is connected, a red
and a green indicator light on the control panel will
be on. See fig. 9.
Fig. 9 When the mains supply cable is
connected, these two indicator lights will
be on
* Does not apply to pump versions for Australia.

6.3 Generator or inverter

The MQ can be powered by a generator
or an inverter. However, the pump will
only operate satisfactorily if the
Caution
generator or inverter generates a true
sinusoidal wave with the necessary
power and voltage input.
*
11