SEW-Eurodrive MOVIGEAR MGFx-DSI Series, Operating Instructions Manual

Page: 306 / 408

11
Technical data and dimension sheets
Braking resistors
Operating Instructions – MOVIGEAR
®
performance
306
11.4.2 Integrated BW1 braking resistor
The following diagram shows the current-carrying capacity of the BW1 braking resistor
per braking operation:
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] Deceleration ramp 10 s
[2] Deceleration ramp 4 s
[3] Deceleration ramp 0.2 s
c/h Cycles/hour
Calculation example
The known values are:
• Average braking power: 144 W
• Deceleration ramp: 2 s
• 200 brake applications per hour
Calculating the energy from the power of the deceleration ramp:
W P t
W W s
W J
= ×
=
×
=
144 2
288
25296909835
For the deceleration ramp of 2 s, you can use deceleration ramp [3] (0.2 s) in the dia-
gram. Use the characteristic curve with the shorter deceleration ramp because a
shorter deceleration ramp means more braking energy.
The diagram permits 290 J of braking energy for the 0.2 s deceleration ramp and
200 cycles per hour. In this case, the required 288 J can be dissipated via BW1.
25887548/EN – 04/2019