Diaphragm Controller (Optional); Connecting The Power Supply Cable - Grundfos DMH 25X Installation And Operating Instructions Manual

7.4 Diaphragm controller (optional)

Warning
Explosion-proof pumps with diaphragm leakage detection
are fitted with a contact pressure gauge in explosion-proof
version.
The pressure gauge must be earthed.
Connecting the earth cable (4u), see figure below.
6s
S
5s
3u
4u
2)
2u
U
5u
3u
T
Diaphragm controller
Pos. Components
S Contact pressure gauge
5s Union nut
6s Contact output
T Ball non-return valve
U Connection piece
2u Deaeration screw
3u O-rings
4u Connection for earth cable
5u Union nut
or locking unit (instead of contact pressure gauge and its
2)
connection)

7.5 Connecting the power supply cable

Warning
Disconnect the power supply before connecting the power
supply cable!
Before connecting the power supply cable, check that the
rated voltage stated on the pump nameplate corresponds
to the local conditions!
Do not make any changes to the power supply cable or
plug!
The assignment between the plug-and-socket connection
and the pump must be labelled clearly (e.g. by labelling
Caution
the socket outlet).
The pump can be automatically started by connecting the
Caution
power supply!
• Do not switch on the power supply until you are ready to start
the pump.
7.5.1 Versions with mains plug
• Insert the mains plug in the mains socket.
7.5.2 Versions without mains plug
Warning
The pump must be connected to an external clearly label-
led mains switch with a minimum contact gap of 3 mm in
all poles.
• Connect the motor to the power supply in accordance with local
electrical installation regulations and the connection chart on the
terminal box cover.
Warning
The specified enclosure class can only be ensured if the
power supply cable is connected with the same degree of
protection.
Observe the direction of rotation!
To protect the motor, install a motor protecting switch or
Caution
motor contactor, and set the bimetal relay to the rated mo-
tor current for the available voltage and frequency.
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