Dimensioning Of Brake Resistor - BONFIGLIOLI ACTIVE Cube ACU 201-01 Operating Instructions Manual

18.4.1 Dimensioning of Brake Resistor

WARNUNG
Connect a brake resistor following the instructions and safety information provided in
chapter 6.4.4 "Connection of a Brake Resistor".
The following values must be known for dimensioning:
Peak braking power P
−
− Resistance R
− Operation Time OT in %
Calculation of peak braking power P
•
=
P
b Peak
Calculation of resistance R
•
U
R =
b
P
b
The switch-on threshold U
switched on. The switch-on threshold can be set, as described above, via parameter
Trigger threshold
CAUTION
The resistance of the brake resistor must not be less than the minimum value R
10%. The values for R
If the calculated resistance R
values, the lower resistance is to be selected.
Calculation of operation time OT
•
b t
D =
C
t
cycle
t
b
In the case of infrequent short braking operations, typical values of the operation
time OT 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 recom-
mended that the operating time OT be calculated according to the above formula.
The calculated values for P
ers for determining the resistor-specific permanent power.
244
in W
b Peak
in Ω
b
P
b Peak
J
( )
n
⋅ −
2 2
1
J n n
1 2
⋅
182 t
n
2
b
t
b
R
2
b
U
d BC
d BC
P
b Peak
Peak
is the DC link voltage at which the brake resistor is
d BC
506.
are listed in chapter 4 "Technical Data".
b min
of the brake resistor is between two standard series
b
OT
t
b
t
cycle
t
cycle
, R
b Peak
Operating Instructions ACU
b Peak
= Peak braking power in W
= Moment of inertia of drive system kgm
= Speed of drive system before the braking oper-
-1
ation in min
= Speed of drive system after the braking opera-
-1
tion in min
= Braking time in s
b
= Resistance in Ω
= Switch-on threshold in V
= Peak braking power in W
= Operation time
= Braking time
= Cycle time
Example:
t = 48 s, t
b
D C
and OT can be used by the resistor manufactur-
b
2
b min
= 120 s
cycle
b t
= = =
0 4 . 40 %
t
cycle
06/13
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