Festo CAMC-G-S3 Manual page 70

2 Product description of safety module CAMC-G-S3
Important: To use the safety function SBC, a clamping unit or holding brake with appropri­
ate safety classification must be used. It is always the case that, for all types of clamping
units without certification, a risk analysis must be carried out and the suitability determ­
ined for the appropriate safety application. Otherwise, these may not be used.
The holding brake in motors is not usually appropriately qualified.
The SBC function is activated by the factory setting (advance parameterisation).
As long as the function is used by other functions (request through STO, by other para­
meterisations or an error when other requested safety functions are violated), it cannot
be deselected.
Function
The "Safe Brake Control" function immediately switches off the voltages for the connected clamping
unit or holding brake. The clamping unit or holding brake takes effect and brakes the motor or the axle.
Dangerous movements are thus prevented mechanically. The braking time is dependent on how quickly
the brake engages and how high the energy level is in the system.
Please note
If there are suspended loads, they usually drop if SBC is requested simultaneously with
STO. This can be traced back to the mechanical inertia of the clamping unit or holding
brake and is thus unavoidable.
The safety module also makes the safety function SS1 available in combination with
SBC or the safety function SS2. Please check whether you can or may use these safety
functions in your application with SBC instead of STO.
Safe brake control can only be used with clamping units or holding brakes, which engage in the de-en­
ergised state. The clamping unit or holding brake is then opened by supplying energy.
When using the brake output of the basic unit, ensure that the cables are routed so that they are pro­
tected. If the load capacity of the safe outputs of the safety module is sufficient, then cross-circuit
detection with test pulses is possible.
The logic to request the SBC safety function is shown in the following block diagram:
70 Festo – GDCP-CAMC-G-S3-EN – 1406NH – English