Electrical Connections; Versions With Mains Plug; Versions Without Mains Plug; Commissioning - Grundfos DMX 226 Installation And Operating Instructions Manual

7. 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 quali-
fied 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 au-
thorised 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 the
Caution
signal inputs and outputs.
The pump is switched off by switching off the power sup-
ply.
Note
Do not switch on the power supply until the pump is going
to be started.

7.1 Versions with mains plug

• Insert the mains plug in the mains socket.

7.2 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!
When the pump is used with a frequency converter, the
Caution
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.

8. Commissioning

8.1 Checks before start-up

• Check that the rated voltage stated on the pump nameplate
corresponds to the local conditions!
• Check that all connections are secure and tighten, if necessary.
• Check that the dosing head screws are tightened with the
specified torque and tighten, if necessary.
• Check that all electrical connections are correct.

8.2 Start-up

Before start-up, replace the screw plug by the deaeration
screw!
Caution
During transport, the deaeration opening must be closed
with the screw plug!
After initial start-up and after each time the diaphragm is
changed, tighten the dosing head screws.
After approximately 6-10 operating hours or two days,
Caution
cross-tighten the dosing head screws using a torque
wrench.
Maximum torque: 6 Nm.
1. Open the suction and discharge isolating valves (15, 16), if
installed.
22
2. Open the deaeration valve (17), if installed, in the discharge line,
3. Switch on the power supply.
4. Pumps with AR control unit only: Press the "Start/Stop" button
5. Set the stroke-length adjustment knob to 100 %.
6. Leave the pump running until the dosed medium is free of air
7. Close the deaeration valve (17), if installed.
The pump is now ready for operation.
Initial start-up
DosingPump.ir
or relieve the pressure on the discharge side so that the medium
can run out without a counterpressure.
and keep it pressed.
• The pump switches to continuous operation.
bubbles.
17 16
15