Electrical Connections - Grundfos DMX 221 Montage- Und Betriebsanleitung

Connection of hose lines
• Push the hose firmly onto the connection nipple and,
depending on the connection, secure using a connection
counterpart or hose support clip.
• Fit the gasket.
• Screw onto the valve using the union nut.
Fig. 12 Connection of hose lines
Connection of DN 20 pipe lines
• Depending on the pipe material and connection, glue it (PVC),
weld it (PP, PVDF or stainless steel) or press it in (stainless
steel).
• Fit the gasket.
• Screw onto the valve using the union nut.
Fig. 13 Connection of DN 20 pipe lines
Using a dosing controller
• Screw the dosing controller onto the discharge valve.
• Connect the discharge line to the dosing controller.
Fig. 14 Dosing controller
2 mm

6. Electrical connections

Make sure that the pump is suitable for the electricity supply on
which it will be used.
Warning
Electrical connections must only be carried out by
qualified personnel!
Disconnect the power supply before connecting the
power supply cable and the relay contacts!
Observe the local safety regulations!
Warning
The pump housing must only be opened by
personnel authorised by Grundfos!
Warning
Protect the cable connections and plugs against
corrosion and humidity.
Only remove the protective caps from the sockets
that are being used.
The power supply must be electrically isolated from
Caution
the signal inputs and outputs.
The pump is switched off by switching off the power
supply.
Note
Do not switch on the power supply until the pump is
going to be started.
6.1 Versions with mains plug
• Insert the mains plug in the mains socket.
6.2 Versions without mains plug
• Connect the motor according to the wiring diagram in the
terminal box.
Observe the direction of rotation!
A motor protector, adjusted to the rated motor
current, must be provided by the customer. This is
also necessary for versions with AR control unit!
Caution
When the pump is used with a frequency converter,
the jumpers in the terminal box have to be set
according to the converter voltage.
The jumpers of three-phase motors are factory-set
for star connection.
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