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Procedure
Proceed as follows to reform DC link capacitors:
1. Remove the DC link bridge.
2. Make sure that the device does not receive a switch-on command (e.g. via PROFINET/
PROFIBUS, BOP20 or terminal block).
3. Connect the forming circuit. When forming with PTC resistors, the component must remain
in the circuit for approx. 1 h.
CAUTION
Burns resulting from high surface temperature of the PTC resistors
The resistors can reach a high temperature if there is a fault in the component (surface
temperature > 80 °C). You can get seriously burnt when touching the surface.
• Mount the PTC resistors so that contact is not possible. If this is not possible, attach
clearly visible and understandable warning notices at hazardous positions.
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Figure 9-2
Forming circuit for Line Modules with PTC resistors
Service and maintenance
9.3 Forming the DC link capacitors
Booksize power units
Equipment Manual, 01/2022, 6SL3097-6AC30-0BP0
151