Cleaning And Inspecting The Pump; Checking The Sensors - Grundfos SE1 50 Series Service Instructions Manual

Filling with oil
1. Turn the pump so that the oil filling holes are placed opposite
each other, pointing upwards.
Oil filling/venting
Oil filling holes
Fig. 1
2. Pour oil into the oil chamber.
3. Fit the oil screws with new gaskets.

8.5 Cleaning and inspecting the pump

Clean the pump on site at regular intervals by following this
procedure:
• Lift the pump out of the pit.
• Hose down the pump externally, using a high-pressure cleaner
at maximum 100 bar.
• Remove caked dirt from the motor to ensure good heat
conductivity. Use a mild detergent approved for disposal into
the sewage system.
• If necessary, scrub the pump, using a soft brush.
Visual inspection of the pump must include the following points:
• Search for cracks or other external damage.
• Check the lifting bracket and lifting chain for wear and
corrosion.
• Inspect the power cable for cracks or lacerations in the
sheath, for kinks or for other damage.
• Inspect visible parts of the cable entry for cracks.
• Check that the cable is firmly connected to the top cover.
• Check all visible screws for self-loosening and tighten, if
necessary.
The pump is fitted with a vent valve at the bottom of the cooling
jacket. Remove and clean the valve, if necessary. Clean the vent
hole before refitting the valve after cleaning.

8.6 Checking the sensors

Sensor check measurements must be made by
Grundfos or persons authorised by Grundfos.
Make the measurements from the free end of the cable (10 m),
the other end of the cable is connected to the pump. In case the
pump cable is longer than 10 m, contact Grundfos for correct
values.
A Grundfos sensor test box can be used for check measuring the
sensors. The sensor test box gives the response values by
means of LEDs, to indicate if the sensor is ok. See section
8.6.1 Checking by means of a test box.
It is also possible to measure the sensors by means of a standard
instrument measuring Amperes and Ohms. See section
8.6.2 Checking by means of a standard instrument.
8.6.1 Checking by means of a test box
Text box
Fig. 2
Proceed as follows:
1. Connect the text box and sensors according the wiring
diagram. See fig 3.
T1/P1
T
T2/P2
M
T5/P5
Wiring diagram for test box and sensors
Fig. 3
2. Observe led lights on the test box and compare to the table
below.
Fault
None
Moisture
No pump
Temperature
WIO
WIO - air (WIA)
WIO - water
T1
T2
T5
mA
LED Output [mA]
Green 4-20
Red 0
Red 0
Red 4-20
Green 0
Green 3.5
Green 22
9