Lenze DSD Bedienungsanleitung PDF herunterladen (Seite 328)

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11 Drive Dimensioning

11.3 Mechanical brake selection

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Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23

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11.3.3 Dimensioning criteria

For the dimensioning of the motor brake as holding brake, the following parameters are taken into

consideration:

• Moment of inertia of the brake

• Holding torque

•Safety factor

• Electrical connection

• Installation feasibility with regard to the motor

The following is not taken into consideration:

• Twin rotor disc brakes of the BFK458 series

• Operating times

• Thermal dimensioning for cyclic braking processes

• Service brake: wear calculation for braking during operation and emergency stop.

 Danger!

Falling loads in the case of vertical conveyors (angle > 45°) such as hoist drives.

In DSD you cannot dimension service brakes, but only holding brakes.

Protective measures:

• In order to ensure that the brake works safely, carry out all tests required manually.

• Dimension brakes for vertical conveyors with a safety factor ≥ 2.

• Do not use a permanent magnet holding brake (PMB) as service brake. It cannot brake

safely, since the braking torque decreases significantly at higher speeds.

• Additionally use a redundant brake assembly outside the motor, or a motor with a

spring-applied brake (BFK).

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