Festo CAMC-G-S3 Manual page 74

2 Product description of safety module CAMC-G-S3
Error detection:
The safety function can analyse an external feedback signal, thus checking that the clamping unit or
holding brake has actually engaged. Analysis takes place via the VIN_BRK_ACK input, if this function is
activated via the parameter P17.02.
A time delay for feedback can be parameterised using the parameter P17.00.
The feedback signal is analysed after the delay has elapsed. If there is no feedback, then the error mes­
sage [54-0] SBC_ERR.
Please note
If the brake output at [X6] is used, then the feedback input VIN_BRK_ACK can be
switched to the feedback input of the basic unit (signal LIN_BRAKE_X6_FB). This signal
maps the switching status of the safe braking output at the basic unit.
If there is a motor cable at the brake output [X6], but no clamping unit or holding brake
is connected, then interference is possible in the open brake cable, leading to incorrect
feedback (error [54-0]).
• In this case, deactivate the acknowledgment input.
Please note
When an external clamping unit is used, the acknowledgment input VIN_BRK_ACK must
be mapped to a safe digital input.
Only the status "Brake fallen in" (level monitoring of VIN_BRK_ACR) is monitored. The
feedback is not monitored when there is an "energised brake".
In addition, the SBC function has integrated time monitoring:
The SBC function may be requested for a maximum of 24 hours. The clamping unit or holding brake
must therefore be switched (vented) at least once within 24 hrs, as the circuit breakers can only be
tested with test pulses when switched on.
If the time limit is exceeded, the error [54-6] 24H_ERR is generated.
The time restriction becomes invalid if the SBC function is used in connection with a safe output
(DOUT40 ... DOUT42) or the holding brake is not used for safety purposes. The 24 hr. monitoring can
then be deactivated by the expert parameter P17.04.
Please note
In the delivery status of the safety module, the SBC function is always configured in
conjunction with the output [X6], even if you do not wish to use the SBC function. In
applications in which the brake control lines are run in the motor cable, if no holding
brake is connected on the motor side, interference can be coupled into the open brake
lines. The safety module then generates the error 57-0.
• In these cases, please disconnect the brake control lines from X6 and connect them
to PE.
74 Festo – GDCP-CAMC-G-S3-EN – 1406NH – English