Bosch 4306 Service Manual download pdf (Page 34)

• DOK-POWER*-KDV*2.3****-ANW1-EN-E1,44 • 06.97

4. Control circuits

4.6. Control circuits for a controlled braking of the

drives for an E-stop or power failure

For those drives coupled as an electronic drive via the NC control, and which

cannot accept a phase-angle error with a power failure or an E-stop.

The DC bus voltage is not short-circuited. This means that power is available

for a controlled braking of the drives.

The energy stored or regenerated in the DC bus must be greater than the

energy required to energize asynchrous drives or to execute a return action.

For an E-stop or if a KDV monitor is tripped, drives are stopped by the NC

control unit under drive regulation.

The NC bridge (X10/13 - X10/14) must be closed!

The mains contactor must not be permitted to switch off the drive

enable signal of the drives !

The mains contactor is immediately switched off when the E-stop is tripped.

There is a controlled braking of the drives by the NC control unit.

When the NCB contacts are jumpered, the signal for command-to-

zero will be suppressed if there is a power fault. The superordinate

control must assure that the drive is stopped. This high priority

control must monitor the UD contact of the KDV 2.3 and bring the

drive to a halt whenever the contact should open.

There will otherwise be an uncontrolled coasting of the drives if the

power supply is faulty!

Application

Features

Operation

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 56 57

No comments

Bosch 4306 Service Manual Page 34