Connection
4.2 Connecting the Braking Module
Braking Module / braking resistor
Operating Instructions, 11/2017, A5E00331454A
33
Threshold switch
The response threshold at which the Braking Module is activated and the DC-link voltage
generated during braking are specified in the following table.
WARNING
Electric shock when operating the threshold switch
Operating the threshold switch when a voltage is present can cause death or serious injury.
•
Only operate the threshold switch when the Power Module is switched off and the DC-
link capacitors are discharged.
Table 4- 5
Response thresholds of the Braking Modules
Voltage
Response
threshold
Switch
position
Comment
3-phase 380 ...
480 VAC
673 V
1
774 V is the default factory setting. For line voltages of
between 3-phase 380 and 400 VAC, the response
threshold can be set to 673 V to reduce the voltage
stress on the motor and converter. This does, however,
reduce the possible braking power with the square of the
voltage (673/774)² = 0.75.
The maximum possible braking power is, therefore, 75%.
774 V
2
3-phase 500 ...
600 VAC
841 V
1
967 V is the default factory setting. With a supply voltage
of 3-phase 500 VAC, the response threshold can be set
to 841 V to reduce the voltage stress on the motor and
converter. This does, however, reduce the possible brak-
ing power with the square of the voltage (841/967)² =
0.75.
The maximum possible braking power is, therefore, 75%.
967 V
2
3-phase 660 ...
690 VAC
1070 V
1
1158 V is the default factory setting. With a supply volt-
age of 3-phase 660 VAC, the response threshold can be
set to 1070 V to reduce the voltage stress on the motor
and converter. This does, however, reduce the possible
braking power with the square of the voltage
(1070/1158)² = 0.85.
The maximum possible braking power is, therefore, 85
%.
1158 V
2
Note
Positions of the threshold switches
The switch positions of the threshold switches of the Braking Modules are positioned on the
panel as follows:
•
Braking Modules for frame sizes FX and GX: position "1" is up; position "2" is down
•
Braking Modules for frame sizes HX and JX: position "1" is back; position "2" is front
