The above figure is an wiring example with frequency converter Fe.
The braking resistor connector connection at the
frequency converter (terminals (+) and PB at con‐
verters from 0.75 – 7.5 kW) and the braking resistor
connection at the brake chopper (terminals P1 and
PB) have no short circuit protection! Wrong wiring
will cause damage to the components!
Please ensure the reliable grounding of the brake chopper.
Fig.7-4: Brake chopper wiring
The above figure is an wiring example with frequency converter Fe.
7.2.2 Brake Resistor
Brief introduction
Energy regenerated when a 3-phase AC motor is decelerated (the frequency is re‐
duced) is recovered and fed into the frequency converter. To prevent overvoltage of the
frequency converter, an external braking resistor may be used. A power transistor dis‐
charges the DC bus voltage energy (braking voltage threshold at approx. 660 VDC) to
the braking resistor, and the energy is lost as heat.
Bosch Rexroth AG
Accessories
DOK-RCON01-REX*F*UL***-IN01-EN-P
Rexroth Frequency Converters
60/65
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