REXROTH EFC3600 Series, Instruction Manual, Page: 84 / 90

Fig. 7-4: Brake chopper wiring
The figure above 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
reduced) is recovered and fed into the frequency converter. To prevent overvolt-
age of the frequency converter, an external braking resistor may be used. A pow-
er transistor discharges the DC bus voltage energy (braking voltage threshold at
approx. 660 VDC) to the braking resistor, and the energy is lost as heat.
●
If a resistance lower than the recommended value (and no less
than the minimum resistance) is used, contact the agent or manu-
facturer for calculation of resistance power.
●
Safety and flammability of surrounding conditions shall be consid-
ered. Keep all items at least 100 mm away from the braking resis-
tor.
●
A braking resistor can not work overload for a long time. 10 times
of rated load should not exceed 5 seconds.
●
There could be smoking for the first use of the braking resistor
since organic silicon is used on the surface which is normal and
does not affect the performance of the braking resistor.
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Accessories
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