Siemens SINAMICS S120 Manual page 447

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Motor holding brake connection

To ensure reliable opening of the motor holding brake, it requires a 24 V ± 10% voltage

supply at the motor connection. It must be taken into account that voltage dips can occur

along the supply cable.

● Use a Control Supply Module or a regulated DC power supply, whose setpoint is set to

● Use supply cables with a minimum cross-section of 1.5 mm² and a maximum length of

Danger of death due to high touch voltages for brake cables

For motor cables with integrated brake cable, when the motor is operated, the motor can

charge the brake cable up to hazardous voltage levels. Coming into contact with the

conductors or the shield of the brake cable can result in death or serious injury.

• Use motor cables with separate, shielded brake cables and connect the shield of the

Premature wear of the motor holding brake when operated outside its permissible voltage

Operating the motor holding brake outside its permissible voltage range at the motor

connection will damage the brake.

• Ensure that the motor holding brake is only operated within its permissible voltage

Faulty brake function due to inadmissible wear

Inadmissible wear means that the braking function can no longer be guaranteed.

• Comply with the predefined Emergency Stop characteristics.

• Avoid repeated brief acceleration of the motor against a holding brake that is still closed.

The motor brake must be connected via connector X11. It is not permitted to directly connect

the cable BR- to the electronics ground M.

The total length of the power cables (motor feeder cables and DC link cables) must not

exceed the values listed in Chapter Combination options, Line Modules with line reactors

and line filters (Page 135).

Booksize Power Units

Manual, (GH2), 07/2016, 6SL3097-4AC00-0BP8

brake cable at both ends.

Consider the operating times of the brakes and the relays in the drive control and

Motor Modules Booksize

6.5 Motor Modules Liquid Cooled

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