Temperature Switch; Short-Term Capacity; Duty Cycle - Beckhoff AX2090-BW5 Series Documentation

Electrical installation
5.4

Temperature switch

Destruction of the brake resistor!
The temperature switch is exclusively used for temperature monitoring. The brake resistor
is not switched off.
Attention
The temperature switch has a potential-free N/C contact, which enables immediate response to any overload
of the brake resistor through analysis in the AX5000 or the PLC. Connect the cable directly to a free input of
plug "X06". Then parameterize it such that the AX5000 stops the motor(s) with an emergency ramp or the
PLC reads and processes this input.
Type
AX2090-BW50-0300
AX2090-BW50-0600
AX2090-BW50-1600
AX2090-BW51-1000
AX2090-BW51-3000
AX2090-BW51-6000
AX2090-BW52-3000
AX2090-BW52-6000
AX2090-BW53-3000
AX2090-BW53-6000
AX2090-BW54-3000
AX2090-BW54-6000
5.5

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.

5.5.1 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.
Further information of external brake resistors:
For further information on the configuration and diagnostics of external brake resistors,
please refer to the function description of the servo drive AX5000: "Diagnostic of external
Note
brake resistors".
14
Switching temperature
[°C]
180
180
180
180
85
85
85
85
85
85
85
85
Sample 1
T = 60 s
on
Cycle time = 280 s
Duty cycle = 50%
Version: 1.3
Switching current
24 VDC or 230 VAC
[A]
2
2
2
2
2
2
2
2
2
2
2
2
) and the cycle time. Cycle times up
on
Sample 2
T = 40 s
on
Cycle time = 100 s
Duty cycle = 40 %
External brake resistor AX2090-BW5x