Motor Cable; Non-Return Valve; Level Sensor - Grundfos Multilift M Montage- Und Betriebsanleitung

5.1.4 Motor cable

The motor cable is fitted to the motor via a cable entry. The
enclosure class is IP68. The length of the cable is either 4 or 10
m.
Nameplate, motor
1 DK - 8850 Bjerringbro, Denmark
Prod.-Nr. 98189706 - A
2
P.c. 1217
f 50
3
Phases 3
4
U 400
V
5
5.3 A
I
1/1
6
2.8
P kW
1
7
P 2.2
2
8
Fig. 3 Nameplate, motor
Pos. Description
1 Product number and model
2 Production code, year and week
3 Frequency
4 Number of phases
5 Rated voltage
6 Rated current
7 Input power
8 Shaft power
9 Serial number
10 Operating mode
11 Power factor
12 Rated speed
13 Insulation class
14 Weight
15 Production country
Serial no. 001 9
Hz S3-40%-1min
10
0.77
11
-1
n 1405 min
12
F
13
G 24 kg
14
IP68
Made in Germany
15

5.1.5 Non-return valve

The DN 80 non-return valve includes a drain screw to lift up the
internal valve flap in order to drain the outlet pipe in case of
maintenance or service. The valve is designed and tested
according to EN 12050-4. See fig. 4.
Loosen the lock nut a little before turning the drain
Note
screw.
Drain screw
Fig. 4 Non-return valve

5.1.6 Level sensor

The piezoresistive pressure sensor placed in the controller is
connected via a hose to a pressure tube in the tank. The screw
cap where the hose is connected includesa connection for a DN
100 tube. This tube, the pressure tube, extends down into the
tank. The rising liquid level compresses the air inside the
pressure tube and hose, and the piezoresistive sensor transforms
the changing pressure into an analogue signal. The control box
uses the analogue signal to start and stop the pump and to
indicate high-level alarm. The pressure tube is fixed underneath
the screw cap and can be taken out for maintenance, service and
for cleaning the inside of the tube. An O-ring ensures tightness.
The hose is supplied in lengths of 4 or 10 m. The hose must be
connected to the controller.
Fig. 5 Screw cap with hoseand DN 100 tube
7