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17.4.1 Dimensioning of Brake Resistor
The following values must be known for dimensioning:
−
−
−
P
R =
The switch-on threshold U
switched on. The switch-on threshold can be set, as described above, via parameter
Trigger Threshold
Caution!
If the calculated resistance R
values, the lower resistance is to be selected.
In the case of infrequent short braking operations, typical values of the duty cycle DC
are at 10 %, for long braking operations ( ≥ 120 s) typical values are at 100%. In the
case of frequent deceleration and acceleration operations, it is recommended that the
duty cycle DC be calculated according to the above formula.
The calculated values for P
for determining the resistor-specific permanent power.
Warning!
186
186
Peak braking power P
Resistance Rb in Ω
Duty cycle DC in %
•
Calculation of peak braking power P
(
)
2
2
J
⋅
n
−
n
=
1
2
b
Peak
182
⋅
t
b
•
Calculation of resistance R
2
U
d
BC
b
P
b
Peak
506.
The resistance of the brake resistor must not be less than the minimum
value R
b min
Data".
•
Calculation of duty cycle DC
b t
D =
C
t
cycle
t
b
t
cycle
The brake resistor is to be connected according to the specifications and
instructions in chapter "Connection of a Brake Resistor".
Operating Instructions ACTIVE
Operating Instructions ACTIVE
in W
b Peak
P
= Peak braking power in W
b Peak
J
= Moment of inertia of drive system kgm
n
= Speed of drive system before the braking op-
1
eration in min
n
= Speed of drive system after the braking opera-
2
tion in min
t
= Braking time in s
b
b
R
= Resistance in Ω
b
U
= Switch-on threshold in V
d BC
P
= Peak braking power in W
b Peak
is the DC link voltage at which the brake resistor is
d BC
-10%. The values for R
of the brake resistor is between two standard series
b
DC
= Duty cycle
t
= Braking time
b
t
= Cycle time
cycle
, R
and DC can be used by the resistor manufacturers
b Peak
b
b Peak
-1
-1
are listed in chapter "Technical
b min
Example:
t
= 48 s, t
= 120 s
b
cycle
b t
D
C
=
=
0
4 .
t
cycle
2
=
40
%
06/07
06/07
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