Bosch 4306 Service Manual download pdf (Page 27)

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

4. Control circuits

E-Stop button, light

barrier, safety door,

step-pad contacts

tripped or pendant

enable deactivated

These monitoring devices serve to protect personnel. The drive equipment of

the machine must be taken into consideration for the error responses in this

case:

Machines with modular asynchronous drives

The danger caused by a main spindle drive of a tooling machine coasting

uncontrolled (usually asynchronous drives) is greater than the danger from the

uncontrolled coasting of a feed drive (usually synchronous drives).

If the referenced monitoring devices are tripped, then both the mains contactor

and the drive enable signal should be switched off. The DC bus voltage must

not be short-circuited because asynchronous drives cannot otherwise be

braked to a standstill.

Machines with modular synchrous drives (e.g., handling systems)

Switching off the mains contactor and removing the drive enable achieves the

shortest possible braking distances with intact drives. Only if the energy stored

in the DC bus capacitors can initiate dangerous drive movements, must the

dynamic brake be used with a fault.

Dynamic brake contactors and resistors are not suited for jogging.

The control cabinet could be damaged if this is ignored!

Input signal Existing drive equipment

only modular

synchronous

drives

only modular

asynchronous

drives

Recommended response

Bb1 contact open

Limit switch open

Following error

signal from the NC

E-stop button

pressed

Light barrier, safety

doors, step pad

actuated

Pendant enable

button deactivated

1) Only if dangerous drive movements can be triggered by energy still present in the DC bus capacitors.

Figure 4.2: When to use the DC bus dynamic brake

Pendant enable button

DC bus

dynamic brake

activated

drive enable and

mains contactor

OFF

modular

asynchrous and

synchronous

drives

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Bosch 4306 Service Manual Page 27

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