Bosch Rexroth EFC 3600 Operating Instructions Manual page 170

Bosch Rexroth AG
Accessories
● In the tables, the recommended resistance of the brake resistor is 100
% braking torque, selected according to necessity. If the actually nee‐
ded torque is not 100 %, the resistance of the brake resistor in the table
should be adjusted in inverse proportion, i.e. how much the brake tor‐
que increases based on 100 %, the resistance of the brake resistor
should decrease by the same amount, vice versa.
● When selecting brake resistor R
through the resistor is less than the current output ability of the brake
unit. The current I
mula I
unit.
● After the adjustment of the resistance of brake resistor, the power of
brake resistor should be also adjusted appropriately. The power can be
calculated by formula P
condition, the braking ratio OT % can be selected to reduce the power
of brake resistor reasonably for intermittent braking load. The power of
brake resistor can be calculated by formula P
which k is the derating coefficient of brake resistor. The selection of the
brake torque should be in general smaller than 150 % of the rated mo‐
tor torque, or consulting the technical support for more information.
168/235
through the brake resistor can be calculated by for‐
c
=U /R , in which U
c d b
max
DOK-RCON03-EFC-3600***-IT01-EN-P
Rexroth Frequency Converter EFC 3600
, make sure the current I
b
is the braking operating voltage of brake
d
=U / R . According to the actual working
2
d b
which flows
c
=K * P * OT %, in
R max