Replacing The Cable Plug; Testing The Product; Tightness Tests; Testing The Operation Of The Motor - Grundfos SEG AUTOAdapt Service Instructions Manual

11.5.2 Replacing the level sensor
Dismantling the level sensor
1. Open the electronic unit. See section
electronic unit.
2. Remove the sensor wire from the PC board.
3. Remove the set screw (287c).
4. Press the sensor out of the electronic unit.
5. Clean the sensor hole.
Assembling the level sensor
1. Lubricate and fit the O-ring (287b).
2. Lubricate the sensor hole.
3. Press the sensor home in the electronic unit.
4. Connect the sensor wire to the PC board.
5. Fit a new set screw. See section
6. Fit the electronic unit. See section
electronic unit.

11.6 Replacing the cable plug

11.6.1 Dismantling the cable plug
1. Open the electronic unit. See section
electronic unit.
2. Remove the earth lead screw and the washer.
3. Remove the two plugs from the electronic unit.
4. Press in the three barbs and press the cable plug out of the
electronic unit.
5. Clean the cable entry.
11.6.2 Assembling the cable plug
1. Press the cable plug into the cable entry.
Be careful not to damage the three barbs.
2. Check that the three barbs have engaged with the electronic
unit.
3. Connect the two plugs to the PC board.
4. Fix the earth lead with the screw. Do not forget to fit the
washer.
5. Fit the O-ring (26a)
6. Fit the electronic unit. See section
electronic unit.
11.3.1 Opening the
8. Torques and lubricants.
11.3.3 Closing the
11.3.1 Opening the
11.3.3 Closing the

12. Testing the product

Maintenance and service work on explosion-proof
pump must be carried out by Grundfos or a service
workshop authorised by Grundfos.

12.1 Tightness tests

12.1.1 Testing the motor
Carry out a tightness test if the motor has been dismantled.
Proceed as follows:
1. Secure the pump in vertical position.
2. Remove the cable, if assembled. See section
11.6.1 Dismantling the cable
3. Fit the test plug. See section
4. Pressurise the chamber with 0.6 bar.
5. Observe the pressure approximately 1 minute to detect
possible leaks.
6. If the pressure drops, dismantle the pump, and find and
correct the cause of the leak.
7. Remove the pressure.
8. Remove the test plug.
9. Fit the cable plug. See section
plug.
12.1.2 Testing the oil chamber
Carry out a tightness test if the motor has been opened, and
before refilling the oil. Use nitrogen gas to test the tightness.
Proceed as follows:
1. Secure the pump in vertical position.
2. Remove one oil plug (193), including the washer (194).
3. Fit the test plug instead of the oil plug (193).
4. Pressurise the chamber with 0.6 bar.
5. Observe the pressure approximately 1 minute to detect
possible leaks.
6. If the pressure drops, dismantle the pump, and find and
correct the cause of the leak.
7. Remove the pressure from the oil chamber.
8. Remove the test plug.
9. Fill with oil. See section
10.3 Checking and changing the
motor oil.

12.2 Testing the operation of the motor

Proceed as follow:
1. Connect the pump to Grundfos PC Tool.
2. Connect the pump to the power supply.
3. Check the line current and phase values with the operation
report.
Line current (L1, L2 and L3): 0.1 ~ 0.2 A
Average of line voltages: ~400 V
Phase voltage (L1, L2 and L3): ~230 V.
4. If the stator is in normal condition, the values are close to
each other (between 0.1 and 0.2). If the values differ too much
from each other, then test the stator by means of the motor
tester.
plug.
9.3 Tightness test tools.
11.6.2 Assembling the cable
17