1. Disable the overvoltage control of the drive with parameter 30.30 Overvoltage
control.
2. Set the source of parameter 31.01 External event 1 source to point to the digital
input where the thermal switch of the brake resistor is wired.
3. Set parameter 31.02 External event 1 to Fault.
4. Enable the brake chopper by parameter 43.06 Brake chopper enable. If is
selected, set also the brake resistor overload protection parameters 43.08 and
43.09 according to the application.
5. Check the resistance value of parameter 43.10 Brake resistance.
With these parameter settings, the drive generates a fault and coasts to a stop
on brake resistor over temperature.
WARNING!
If the drive is equipped with a brake chopper but the chopper is not enabled
by the parameter setting, the internal thermal protection of the drive against
resistor overheating is not in use. In this case, the brake resistor must be
disconnected.
Resistor braking, frames R4…R8
￭
Planning the braking system
Frames R4…R8 need external brake choppers and resistors. The table below lists
suitable choppers and resistors. Other resistors can also be used as long as the
minimum resistance value and required power values are met.
For more information, see NBRA-6xx Braking Choppers Installation and start-up
guide (3AFY58920541 [English]) and ACS-BRK Brake Units Installation and start-up
guide (3AFY61514309 [English]).
188 Resistor braking
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