Most of the time the user of PFC capacitors is confused about how to terminate the capacitors. The capacitor manufacturers normally do have a well documented procedure on how to terminate the cables to the capacitors, but unfortunately this information does not reach the end user- when he needs them.
2. Select Multi-strand cables. Finer the strands better the connection. Select and use a ferrule of the correct size. Do not use oversized ferrules as they result in poor connection.
3. Use a proper tool recommended by the Ferrule supplier. Hydro-pneumatic tools are ideally suited for such application.
5. Use the specified torque to tighten the screws of the termination. The example table shows the specifications of the Electronicon Power Factor Correction Capacitors.
6. More are more people are moving towards Torx screw for terminations now. The concept of using Torx Screws for capacitors was started by Electronicon Kondensatoren GmbH, Germany.
Advantages of the TORX screw:
TORX has become one of the world’s leading screw standards, and proper tools are available all over the world.
Below is a general procedure that would help users to have a better connection and faultless operation.
1. Ensure Proper Cable Sizes.
As you will see in the table below- the cables sizes are slightly different from those recommended by the Cable manufacturers. The reason is very simple, yet very easy to miss in the designing of the panels. We would like the cables to act like a heat sink and should be able to drive away the heat from the terminals. On the other hand having smaller cross-section would heat up the terminals and will result in heat damaging the sensitive film inside the capacitor. The terminals insulation may also be damaged and may result in short circuits or other failures.
For example for a 25kvar capacitor one should use 16mm2 instead of 10mm2.
2. Select Multi-strand cables. Finer the strands better the connection. Select and use a ferrule of the correct size. Do not use oversized ferrules as they result in poor connection.
3. Use a proper tool recommended by the Ferrule supplier. Hydro-pneumatic tools are ideally suited for such application.
4. The form of the crimped cables should be rectangular allowing the terminals to get a proper grip on the cable and the cables are held tightly.
5. Use the specified torque to tighten the screws of the termination. The example table shows the specifications of the Electronicon Power Factor Correction Capacitors.
6. More are more people are moving towards Torx screw for terminations now. The concept of using Torx Screws for capacitors was started by Electronicon Kondensatoren GmbH, Germany.
Advantages of the TORX screw:
- optimum control of torque transmission to the screw
- no vertical pressure during fixation required; avoids damage to internal wiring of the capacitor
- unique and definite tool required, confusion impossible: enhances safety and transparency of your assembly process
TORX has become one of the world’s leading screw standards, and proper tools are available all over the world.
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