Siemens SINAMICS S120 Equipment Manual page 332

Air-cooled chassis power units

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DC link components

8.1 Braking Module

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, FB, GX, GB, GD: Position "1" is at the top; position

"2" is at the bottom

• Braking Modules for frame sizes HX and JX: Position "1" is at the back; position "2" is at

"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" fault. This can occur, for example, in cases where there is too much

regenerative energy for the available braking power.

To prevent the DC-link voltage from exceeding the threshold, the Vdc-max controller must be

enabled (p1240) and the device supply voltage set accordingly (p0210).

Air-cooled chassis power units

Manual, 07/2019, 6SL3097-4AE00-0BP9

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