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3.3
Dimensioning conditions
If brake resistors are used, observe the following:
Mean value of regenerative power < permanent power P
ƒ
resistor.
Regenerative power during braking time < heat quantity Q
ƒ
resistor.
Braking time < 10 % of cycle time (braking time + dead time).
ƒ
Always connect the thermal contact and integrate it in a way into the
ƒ
system monitoring that the mains supply will be switched off when the
standard device is overheated.
At all times, the following must apply: In the time interval t
cycle) the cumulative braking times t
braking time t
Calculation
Brake resistor cycle t
+
t
cyc,RB
Q
P
Max. total braking time t
+
t
brk,max
Q
R
U
EDKRBS470R DE/EN/FR 10.0
.
brk,max
:
cyc,RB
Q
B
with
P
d
Heat quantity in Ws
B
Permanent power in W
d
brk,max
@ R
Q
B
B
with
2
U
max
Heat quantity in Ws
B
Resistance in W
B
Max. operating voltage in V
max
l
Product description
Dimensioning conditions
must always be
brk
within the time interval t
of the brake
d
of the brake
B
(brake resistor
cyc,RB
£
of the maximum total
:
cyc,RB
3
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