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General
2.2 Braking resistor
2.2
Braking resistor
Description
In converters with no regenerative feedback capability, the energy that occurs in the drive
train under regenerative conditions is fed back to the DC link where it is reduced via braking
resistors.
The braking resistor is connected to the Braking Module. The distance between the Braking
Module and braking resistor must not exceed 100 m. This enables the resulting heat loss to
be dissipated outside the switchgear room.
Resistors with rated powers of 25 kW and 50 kW are available.
To boost performance, Braking Modules and braking resistors can be connected in parallel.
In this case, the Braking Modules are installed in the discharged air ducts of the Power
Module. Depending on the size of the Power Module, overall up to 3 slots are available:
● Frame size FX: 1 mounting location
● Frame size GX: 1 mounting location
● Frame size HX: 2 mounting locations
● Frame size JX: 3 mounting locations
Since the braking resistors can be used in converters with a wide voltage range, the voltage
can be adjusted (for example, to reduce the voltage stress on the motor and converter) by
setting the response thresholds on the Braking Module.
A thermostat monitors the braking resistor for excessively high temperatures and issues a
signal on a floating contact if the limit value is exceeded.
14
Braking Module / braking resistor
Operating Instructions, 11/2017, A5E00331454A
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