Beckhoff AX8000 System Manual page 64

Accessories
12.1.6.4 Short-term capacity
Brake resistors are usually not operated continuously, but only exposed to short-time duty. In the following
section the permitted short-term capacity is calculated based on the continuous power, overload factor and
duty cycle.
12.1.6.4.1 Duty cycle
The duty cycle is a relative value that depends on the switch-on time (t
to 120 sec. are used directly in the calculation. Should the cycle time exceed 120 sec., the maximum
relevant cycle time of 120 sec. is used in the calculation.
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) and the cycle time. Cycle times up
on
Example 1 Example 2
T = 60 s T
on on
Cycle time = 280 s Cycle time = 100 s
Duty cycle = 50% Duty cycle = 40%
AX8000 - system manual
= 40 s