Measuring The Insulation Resistance - Franklin Electric 226-Serie Montage- Und Betriebsanleitung

Encapsulated Submersible Motors
5 Putting the motor into use
5.3.1 Connecting the short motor cable
Tools and Torques
Preparation
Assembly
5.3.2 Extending the motor cable
5.4

Measuring the insulation resistance

8
Note
 Always a new cable must be used
You need to use the following tools and torques for assembly and inspection work:

6" Motors (all Ratings) 60 N/m ±6 N/m; Wrench 1 3/16" (30,2 mm)

8" Motors (30 – 93kW) 74 N/m ±7 N/m; Wrench 1 3/16" (30,2,) oder 1 5/8" (42mm)

8" Motors (110 – 150kW) 9,0 N/m ±1 N/m, Allen Key 3/16" (4,7mm)
 Remove the sealing plug (1)
 Clean and dry the surfaces of the plug (2) and the socket (3)
Figure 5-5: Connection of the short motor cable
 The unit manufacturer's instructions regarding the cable connection have been observed
 Only extension cable and insulating material used which are suitable for the specific use (specifically
drinking water) and which are approved for the temperatures occurring in the relevant medium
 Cable cross-sections: The tables in the appendix only serve as recommended suggestions. The fitter is
responsible for the correct selection and dimensioning of the cable
 Lay the cable along the pump.
 Connect the ground conductor correctly (motors or integrated ground conductors are prepared for
external grounding).
 Protect the cable connection location against water penetration (shrink hoses, compounds or ready
cable sets).
 Make sure that the short motor cable is always fully surrounded by transport medium for proper
cooling during operation.
This measurement is to be carried out using an insulation measuring unit (500 VDC) before and while
submersing the fully assembled unit at the place of use.
 Before submersing the unit, connect a measuring cable to the ground conductor.
 Make sure that the contact points are clean.
 Connect the other measuring cable to every core of the connected motor cable in succession.
The insulation resistance is shown on the insulation measuring unit.
 Pull back the jam nut (4) until the plug (2) is free
 Apply silicone paste or vaseline to the rubber casing
surfaces
 Apply acid-free grease to the thread of the union nut
 Insert the plug (4) in the socket (3)