Lenze ERBMxxxRxxxx - Manual (Page 29)

Product description
Dimensioning conditions
3
EDKRBM470R DE/EN/FR 5.0 29
l
−H1−Auslegungsbed_Bremswiderst_Bsp
Dimensioning conditions
If brake resistors are used, observe the following:
ƒ Mean value of regenerative power < permanent power P
d
of
the brake resistor.
ƒ Regenerative power during braking time < heat quantity Q
B
of the brake resistor.
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 cyc,RB
(brake resistor cycle) the cumulative braking times t
brk
must
always be
£
of the maximum total braking time t
brk,max
.
Calculation
Brake resistor cycle t
cyc,RB
:
t
cyc,RB
+ Q B
P
d
with
Q B Heat quantity in Ws
P d Permanent power in W
Max. total braking time t
brk,max
within the time interval t
cyc,RB
:
t
brk,max
+ Q B
@ R
B
U
max
2
with
Q B Heat quantity in Ws
R
B Resistance in
W
U max Max. operating voltage in V