Replacing The Electronic Unit - Grundfos seg autoadapt Service Instruction

18. Replacing the electronic unit

1. Open the electronic unit. See section
2. Remove the wires of the dry-running sensor, Pt1000 sensor and capacitor (single-phase pumps) as well as
the earth lead.
3. Cut the motor leads between the electronic unit and the stator housing in the middle.
4. Remove the level sensor (see section 15.) and cable plug (see section 16.) from the old electronic unit and fit
them in the new one.
5. Remove approximately 60 mm of the insulating sheath of the cable from the new electronic unit so that
approximately 75 mm of the three leads are stripped.
6. Cut away 5, 30 and 55 mm of the three leads from the electronic unit and from the stator housing so that the
joints are displaced from each other. See fig. 14. If for instance 5 mm of the red lead from the electronic unit
are cut away, 55 mm of the red lead from the stator housing must be cut away.
7. Strip the three leads from the electronic unit and from the stator housing with a cable stripper.
Do not use side-cutting pliers, as there is a risk of pulling the leads out of the stator housing.
Caution
8. Pull a new 16 mm insulation sheath over the original insulating sheath of the motor leads. See fig. 15.
9. Pinch connectors on the three leads with a crimping tool.
The leads must be connected so that the colours from the electronic unit and the stator
Caution
housing match.
10. Grab the leads on each side of the connector and pull a little to check the joints.
11. Carefully pull the new insulating sheath over the joints and fix it with a cable clip.
Fig. 14 Leads with connectors
12. Connect the wires from the dry-running sensor, Pt1000 sensor and capacitor (single-phase pumps) as well as
the earth lead.
13. Fit the electronic unit. See section
12. Electronic unit.
17.2 Assembly.
17 /20
Fig. 15 Insulating sheath on the three leads