Resistor braking 213
Minimizing electromagnetic interference
Follow these rules in order to minimize electromagnetic interference caused by the
rapid current changes in the resistor cables:
• Shield the braking power line completely, either by using shielded cable or a
metallic enclosure. Unshielded single-core cable can only be used if it is routed
inside a cabinet that efficiently suppresses the radiated emissions.
• 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.
Placing the brake resistors
Install the resistors outside the drive in a place where they will cool.
Arrange the cooling of the resistor in a way that:
• no danger of overheating is caused to the resistor or nearby materials
• the temperature of the room the resistor is located in does not exceed the allowed
maximum.
Supply the resistor with cooling air/water according to the resistor manufacturer’s
instructions.
WARNING!
The materials near the brake resistor must be non-flammable. The
surface temperature of the resistor is high. Air flowing from the resistor is of
hundreds of degrees Celsius. If the exhaust vents are connected to a ventilation
system, ensure that the material withstands high temperatures. Protect the resistor
against contact.
ACS880-01 HW.book Page 213 Monday, July 1, 2013 4:51 PM
Summary of Contents for ACS880-01 Series
Page 4: ...ACS880 01 HW book Page 4 Monday July 1 2013 4 51 PM...
Page 12: ...12 ACS880 01 HW book Page 12 Monday July 1 2013 4 51 PM...
Page 20: ...20 Safety instructions ACS880 01 HW book Page 20 Monday July 1 2013 4 51 PM...
Page 26: ...26 Introduction to the manual ACS880 01 HW book Page 26 Monday July 1 2013 4 51 PM...
Page 80: ...80 Planning the electrical installation ACS880 01 HW book Page 80 Monday July 1 2013 4 51 PM...
Page 96: ...96 Electrical installation 8b R8 R9 ACS880 01 HW book Page 96 Monday July 1 2013 4 51 PM...
Page 98: ...98 Electrical installation 16 13 R8 R9 ACS880 01 HW book Page 98 Monday July 1 2013 4 51 PM...
Page 118: ...118 Start up ACS880 01 HW book Page 118 Monday July 1 2013 4 51 PM...
Page 120: ...120 Fault tracing ACS880 01 HW book Page 120 Monday July 1 2013 4 51 PM...
Page 131: ...Maintenance 131 3 4 5 3 ACS880 01 HW book Page 131 Monday July 1 2013 4 51 PM...
Page 172: ...172 Technical data ACS880 01 HW book Page 172 Monday July 1 2013 4 51 PM...
Page 196: ...196 Dimension drawings ACS880 01 HW book Page 196 Monday July 1 2013 4 51 PM...
Page 209: ...Safe Torque off function 209 Certificate ACS880 01 HW book Page 209 Monday July 1 2013 4 51 PM...
Page 210: ...210 Safe Torque off function ACS880 01 HW book Page 210 Monday July 1 2013 4 51 PM...
Page 220: ...220 Resistor braking ACS880 01 HW book Page 220 Monday July 1 2013 4 51 PM...