Cycle time (s)
Braking duty cycle at 100% tor-
que
Braking duty cycle at over torque
(150/160%)
200-240 V
025-11 kW 120 Continuous 40%
15-37 kW 300 10% 10%
380-480 V
0.37-75 kW 120 Continuous 40%
90-160 kW 600 Continuous 10%
200-800 kW 600 40% 10%
525-600 V
PK75-P75K 120 Continuous 40%
525-690 V
90-400 kW 600 40% 10%
500-560 kW 600
40%
1)
10%
2)
630-1000 kW 600 40% 10%
Table 3.3: Braking at Heavy duty (HD) torque level
1) 500 kW at 86% braking torque
560 kW at 76% braking torque
2) 500 kW at 130% braking torque
560 kW at 115% braking torque
GE offers brake resistors with duty cycle of 5%, 10% and 40%. If a 10% duty cycle is applied, the brake resistors are able to absorb brake power for 10% of the
cycle time. The remaining 90% of the cycle time will be used on dissipating excess heat.
NB!
Make sure the resistor is designed to handle the required braking time
AF-650 GP Design Guide
41
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