Electrical installation
External brake resistor AX2090-BW5x
14
Version: 1.3
5.4
Temperature switch
Attention
Destruction of the brake resistor!
The temperature switch is exclusively used for temperature monitoring. The brake resistor
is not switched off.
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
Switching temperature
Switching current
24 VDC or 230 VAC
[°C]
[A]
AX2090-BW50-0300
180
2
AX2090-BW50-0600
180
2
AX2090-BW50-1600
180
2
AX2090-BW51-1000
180
2
AX2090-BW51-3000
85
2
AX2090-BW51-6000
85
2
AX2090-BW52-3000
85
2
AX2090-BW52-6000
85
2
AX2090-BW53-3000
85
2
AX2090-BW53-6000
85
2
AX2090-BW54-3000
85
2
AX2090-BW54-6000
85
2
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
on
) and the cycle time. Cycle times up
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.
Sample 1
T
on
= 60 s
Cycle time = 280 s
Duty cycle = 50%
Sample 2
T
on
= 40 s
Cycle time = 100 s
Duty cycle = 40 %
Note
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
brake resistors”.
