Dimensioning Conditions - Lenze ERBS Serie Instrucciones Para El Montaje

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Dimensioning conditions

Dimensioning conditions
If brake resistors are used, observe the following:
ƒ Mean value of regenerative power < permanent power P
ƒ Regenerative power during braking time < heat quantity Q
ƒ Braking time < 10 % of cycle time (braking time + dead time).
ƒ Always connect the thermal contact and integrate it in a way into the 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
cumulative braking times t
t .
brk,max
Calculation
Brake resistor cycle t
Q
+
B
t
with
cyc,RB
P
d
Q Heat quantity in Ws
B
P Permanent power in W
d
Max. total braking time t
Q
+
B
t
brk,max
U
max
Q Heat quantity in Ws
B
R
Resistance in
B
U Max. operating voltage in V
max
Examples of the evaluation of the condition
The brake resistor cycle t
given. The braking times t
40
must always be
brk
:
cyc,RB
within the time interval t
brk,max
@ R
B
with
2
W
= 150 s and the max. total braking time t
cyc,RB
and the process cycle t
brk
£
of the maximum total braking time
cyc,Prc
l
of the brake resistor.
d
of the brake resistor.
B
(brake resistor cycle) the
cyc,RB
:
cyc,RB
brk,max
are exemplary.
EDKRBS047R DE/EN/FR/ES/IT 8.0
= 10 s are