Siemens SINAMICS S120 Manual page 510

Options
8.40 L61/L62, L64/L65, braking units
Table 8- 65 Response thresholds of the Braking Modules
Rated Response
voltage threshold
380 ... 673 V
480 V
774 V
500 ... 841 V
600 V
967 V
660 ... 1070 V
690 V
1158 V
Note
Threshold switch positions
The positions of the threshold switches for the braking modules are as follows when
installed:
 Braking Modules for frame sizes FX, FB, GX, GB: Position "1" is up; position "2" is down
 Braking Modules for frame sizes HX, JX: Position "1" is at the back; position "2" is at the
NOTICE
"Overvoltage" fault
Even when the response threshold is set to a low value, the DC link voltage can still reach
the maximum voltage value (hardware shutdown threshold), thus triggering the
"Overvoltage" error. This can occur, for example, in cases where there is too much
regenerative energy for the available braking power.
To prevent a shutdown with the "Overvoltage" error, the V
(p1240 = 1) and the device connection voltage set accordingly (p0210).
508
Switch Comments
position
1 774 V is the default factory setting. With line voltages of between 380 V and
400 V, the response threshold can be set to 673 V to reduce the voltage stress
2
on the motor and drive. 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%.
1 967 V is the default factory setting. With a line voltage of 500 V, the response
threshold can be set to 841 V to reduce the voltage stress on the motor and
2
converter. This does, however, reduce the possible braking power with the
square of the voltage (841/967)² = 0.75.
The maximum possible braking power is, therefore, 75%.
1 1158 V is the default factory setting. With a line voltage of 660 V, the response
threshold can be set to 1070 V to reduce the voltage stress on the motor and
2
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%.
front
max controller must be enabled
dc
Cabinet Modules
Manual, 03/2013, A5E03263538A