Electrical Connections; Connecting The Motor; Commissioning; Checks Before Start-Up - Grundfos DMX 227 Montage- Und Betriebsanleitung

Fig. 12 Connecting the suction and discharge lines
Pos. Components
A Suction valve
B Discharge valve
C Valve disk

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 Connecting the motor

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

7. Commissioning

7.1 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.

7.2 Start-up

After initial start-up and after each time the
diaphragm is changed, tighten the dosing head
screws.
Caution
After approximately 6-10 operating hours or two
days, cross-tighten the dosing head screws using a
torque wrench.
Maximum torque: 70-80 Nm.
7.2.1 Filling with gear oil
The pump has been tested in the factory, and the oil has been
drained prior to shipping. Before starting, fill the pump with the
supplied special oil as follows:
1. Make sure that the pump is switched off.
2. Slacken and remove the oil-filling screw with oil dipstick.
3. Slowly add the gear oil through the oil-filling opening until the
oil reaches the mark on the oil dipstick.
– Gear oil for single pumps: 5.0 litres.
– Gear oil for double pumps: 7.5 litres.
4. Switch on the pump.
5. Switch off the pump after approx. 10 minutes, check the oil
level, and add oil, if necessary.
6. Refit the oil-filling screw with dipstick.

7.2.2 Starting the pump

1. Switch on the power supply.
2. Pumps with frequency converter: Set the dosing rate to
100 %.
See installation and operating instructions for the frequency
converter and section 8.3 Adjustment of dosing flow using a
frequency converter .
The pump is now ready for operation.
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