● In the tables, the recommended resistance of the brake resistor is
100 % braking torque, selected according to necessity. If the ac-
tually needed torque is not 100 %, the resistance of the brake re-
sistor in the table should be adjusted in inverse proportion, i.e.
how much the brake torque increases based on 100 %, the resist-
ance of the brake resistor should decrease by the same amount,
and vice versa.
● When selecting brake resistor R
b
, make sure the current I
c
which
flows through the resistor is less than the current output ability of
the brake unit. The current I
c
through the brake resistor can be
calculated by formula I
c
=U
d
/R
b
, in which U
d
is the braking ope-
rating voltage of brake unit.
● After the adjustment of the resistance of brake resistor, the pow-
er of brake resistor should be also adjusted appropriately. The
power can be calculated by formula P
max
= U
d
2
/ R
b
. According to
the actual working 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
R
= K × P
max
× OT, in 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 motor torque, or consult-
ing the technical support for more information.
EFC 3600 Bosch Rexroth AG
Accessories
DOK-RCON03-EFC-3600***-IT03-EN-P
173/259
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