10
Project planning
MOVIGEAR® performance
Operating Instructions – MOVIGEAR
®
performance
295
10.3.3
Regenerative load capacity of the integrated braking resistor
The following diagram shows the load capacity per braking operation of the BW1 brak-
ing resistor integrated in MOVIGEAR
®
as standard:
200
300
400
500
600
[J]
[1]
[2]
[3]
0
100
0
10
50
100
200
500
1000
2000
3000
4000
5000
6000
[c/h]
25291390987
[1]
Brake ramp 10 s
[2]
Brake ramp 4 s
[3]
Brake ramp 0.2 s
c/h
Cycles/hour
Calculation example
The known values are:
•
Average braking power: 11.8 W
•
Deceleration ramp: 0.92 s
•
6 brake applications per hour
Calculating
the
energy
from
the
power
of
the
deceleration
ramp:
W
P t
W
s
J
= × =
×
=
11 8
0 92
10 9
.
.
.
The specified deceleration ramp in seconds refers to a speed change of 3000 min
−1
.
Calculation of the deceleration ramp for MOVIGEAR
®
: a
down
= 3000 min
−1
x 0.92 s /
1863 min
−1
= 1.5 s.
For the deceleration ramp of 1.5 s, you can use deceleration ramp [3] (0.2 s) in the
diagram. Use the characteristic curve with the shorter deceleration ramp because a
shorter deceleration ramp means more braking energy.
The diagram permits 310 J of braking energy for the 0.2 s deceleration ramp at
6 cycles per hour. In this case, the required 10.9 J can be dissipated via BW1.
25887548/EN – 04/2019
Summary of Contents for MOVIGEAR MGFx-DSI Series
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