10
Project planning
Selecting the braking resistor
Operating Instructions – MOVIMOT
®
flexible
299
Peak braking power
The maximum permitted peak braking power is specified by the resistance value and
the DC link voltage.
The maximum peak braking power required by the application is calculated from the
regenerative parts within a cycle.
The peak braking power required by the application must be lower than the maximum
permitted peak braking power of the braking resistor.
The permitted peak braking power of the braking resistor is calculated as follows:
15156065419
P
max
Maximum peak braking power that the braking resistor can absorb
U
DCL_max
Maximum DC link voltage
R Braking resistance value
The peak braking power for each braking resistor is specified in chapter "Braking res-
istors".
Current-carrying capacity of the brake chopper
The resistance value of the braking resistor R
BR
must not be lower than the minimum
permitted braking resistance R
BRmin
. This ensures that the brake chopper is not dam-
aged.
R
BR
≥ R
BRmin
The continuous braking power toward the braking resistor must not exceed the appar-
ent output power of the frequency inverter.
29129451/EN – 12/2019
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