226 Resistor braking
Selecting and routing the brake resistor cables
Use a shielded cable with the conductor size specified in section Terminal and lead-
through data for the power cables on page 178.
Minimizing electromagnetic interference
Follow these rules in order to minimize electromagnetic interference caused by the
rapid current changes in the resistor cables:
• Install the cables away from other cable routes.
• Avoid long parallel runs with other cables. The minimum parallel cabling
separation distance should be 0.3 meters.
• Cross the other cables at right angles.
• Keep the cable as short as possible in order to minimize the radiated emissions
and stress on chopper IGBTs. The longer the cable the higher the radiated
emissions, inductive load and voltage peaks over the IGBT semiconductors of the
brake chopper.
Maximum cable length
The maximum length of the resistor cable(s) is 10 m (33 ft).
EMC compliance of the complete installation
Note: ABB has not verified that the EMC requirements are fulfilled with external user-
defined brake resistors and cabling. The EMC compliance of the complete installation
must be considered by the customer.
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