Bosch 4306 Service Manual Page 26

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26
• DOK-POWER*-KDV*2.3****-ANW1-EN-E1,44 • 06.97
4. Control circuits
4.2. Using the DC bus dynamic brake
The DC bus dynamic brake is intended to protect the machine.
A few typical (fault) situations are used in this section to explain when the DC
bus dynamic brake should be used.
The following (fault) situations serve as examples:
Bb1 contact open
limit switch open
following error signal from the NC control unit
E-stop actuated
light barrier, safety door or step-pad contact activated
operator enable switch ("dead man key") is deactivated
The Bb1 contact of the KDV 2.3 opens in the presence of an error in the drive
electronics or interrupted feedback lines. In this case, synchronous drives can
only be braked to a standstill by the DC bus dynamic brake! Short-circuiting
the DC bus will not brake asynchronous drives. Mount additional safety
devices if necessary!
Limit switches are activated by the NC control unit or drive errors. For this
reason, the DC bus dynamic brake should be used. The overtravel distances
set (limit switch for the machine limit stop) must therefore be greater than the
braking path needed. Short-circuiting the DC bus will not brake asynchronous
drives. Mount additional safety devices if necessary!
This message indicates a fault in the drive. The DC bus dynamic brake should
be used in this case for this reason. Short-circuiting the DC bus will not brake
asynchronous drives. Mount additional safety devices if necessary!
Dynamic braking is not required for the above errors, if a coasting
of the drives cannot damage the machinery. Motors with mechanical
holding brakes can be an alternative.
The best way to bring the drives to a standstill with a fault depends
on the drive equipment used and the features of the machine. The
following recommendations should, therefore, only be viewed as a
support for the machine builder.
The machine manufacturer is fully responsible for the features and
the scope of the individual safety mechanics!
Bb1 contact open
Limit switch activated
Following error
message from the NC
control unit
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