Resistor cables
Cable type
Use the same cable type for the resistor cabling as for the drive input cabling or, alternatively,
a two conductor shielded cable with the same cross-sectional area.
Maximum cable length
The maximum length of the resistor cable(s) is 10 m (33 ft).
Minimizing electromagnetic interference
Obey 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 is 0.3 meters (1 ft).
•
Cross the other cables at 90 degree 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 greater the radiated emissions,
inductive load and voltage peaks over the IGBT semiconductors of the brake chopper.
Note:
ABB has not verified that the EMC requirements are fulfilled with custom brake
resistors and cabling. The customer must consider the EMC compliance of the complete
installation.
Protecting the resistor cable against short-circuits
The input fuses of the drive will also protect the resistor cable when it is identical with the
input cable.
Resistor thermal switch
Use a resistor with a thermal switch (standard in ABB resistors).
Make sure that the cable in the resistor thermal switch circuit meets the following
requirements:
•
shielded cable
•
rated operating voltage between a core and ground > 750 (
U
0
)
•
insulation test voltage > 2.5 kV
•
jacket material for at least 90 °C (194 °F). Take into account further requirements due
to resistor construction and temperature.
Protecting the system against thermal overload
The brake chopper protects itself and the resistor cables against thermal overload when
the cables are dimensioned according to the nominal current of the drive. The drive control
program includes a resistor overload protection function which can be tuned by the user.
See the firmware manual.
EMC compliance of the complete installation
ABB cannot test that the EMC requirements are fulfilled with custom brake resistors and
cabling. The customer must consider the EMC compliance of the complete installation.
186 Resistor braking
Summary of Contents for ACS880-04FXT
Page 1: ... ABB INDUSTRIAL DRIVES ACS880 04FXT drive module packages Hardware manual ...
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Page 160: ...Standard configuration IP00 UL Type Open 160 Dimension drawings ...
Page 161: ...Drive module with optional support brackets IP00 UL Type Open Dimension drawings 161 ...
Page 163: ...Mounting plate opening 3AXD50000038119 Dimension drawings 163 ...
Page 164: ...3AXD50000038119 164 Dimension drawings ...
Page 182: ... Declaration of conformity 182 The Safe torque off function ...
Page 183: ...The Safe torque off function 183 ...
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