Advanced commissioning
6.7 Application-specific functions
Converter with the CU240B-2 and CU240E-2 Control Units
288 Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
Typical applications for compound braking include:
● Centrifuges
● Saws
● Grinding machines
● Horizontal conveyors
For these applications, the motor is normally operated with a constant speed, and is only
braked down to standstill after longer periods of time.
Image 6-45 Motor brakes with and without active compound braking
Compound braking prevents the DC-link voltage increasing above a critical value. The
inverter activates compound braking depending on the DC-link voltage. Above a DC-link
voltage threshold (r1282), the inverter adds a DC current to the motor current. The DC
current brakes the motor and prevents an excessive increase in the DC-link voltage.
Note
Compound braking is possible only with the U/f control.
ot operate in the following cases:
The "flying restart" function is active
DC braking is active
Vector control is selected
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