Resistor braking
136
Protection of frame size R6
A main contactor is not required for protecting against resistor overheating when the
resistor is dimensioned according to the instructions and the internal brake chopper
is used. The drive will disable power flow through the input bridge if the chopper
remains conductive in a fault situation. Note: If an external brake chopper (outside
the drive module) is used, a main contactor is always required.
A thermal switch (standard in ABB resistors) is required for safety reasons. The
cable must be shielded and not longer than the resistor cable.
With Standard Control Program, wire the thermal switch as shown below. By default,
the drive will stop by coasting when the switch opens.
For other control programs, the thermal switch may be wired to a different digital
input. Programming of the input to trip the drive by “EXTERNAL FAULT” may be
needed. See the appropriate Firmware Manual.
Brake circuit commissioning
For Standard Control Program:
• Enable the brake chopper function (parameter 27.01).
• Switch off the overvoltage control of the drive (parameter 20.05).
• Check the resistance value setting (parameter 27.03).
• Frame sizes R6: Check the setting of parameter 21.09. If stop by coasting is
required, select OFF2 STOP.
For the use of the brake resistor overload protection (parameters 27.02...27.05),
consult an ABB representative.
WARNING! If the drive is equipped with a brake chopper but the chopper is not
enabled by parameter setting, the brake resistor must be disconnected because the
protection against resistor overheating is then not in use.
For settings of other control programs, see the appropriate Firmware Manual.
1DI1
2DI2
3DI3
4DI4
5DI5
6DI6
7+24V
8+24V
9DGND
10 DGND
11 DIIL
Θ
Resistor thermal
switch (standard in
ABB resistors)
RMIO:X22 or X2: X22
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