Festo CAMC-G-S1, Translation Of The Original Instructions

Page: 15 / 50

2 Product description for safety module CAMC-G-S1
Festo – GDCP-CAMC-G-S1-EN – 1412b – English 15
The power supply to the drive is reliably disconnected via the active safety function STO “Safe Torque
Off ”. The drive cannot generate torque and so cannot perform any hazardous movements. With sus­
pended loads or other external forces, additional measures must be taken to reliably prevent sagging
(e.g. mechanical holding brake). In the STO “Safe Torque Off ” state, the standstill position is not
monitored.
The machine must be stopped in a safe manner, e.g. via a safety switching device. This applies specific­
ally to vertical axes without self-locking mechanism, clamping unit or counterbalance.
Note
There is a risk that the drive will advance in case of multiple errors in the
CMMP-AS-…-M3.
If the output stage of the motor controller fails while in the STO status (simultaneous
short circuit of 2 power semiconductors in different phases), a limited dwell movement
of the rotor may result. The rotation angle / path corresponds to a pole pitch. Examples:
– Rotary axis, synchronous machine, 8-pin
è
Movement

45° at the motor shaft.
– Linear motor, pole pitch 20 mm
è
Movement

20 mm at the moving part.
2.2.2 Overview of interface [X40]
On its front, the safety module provides an 8-pin connection [X40] for control ports, feedback contact
and a 24 V auxiliary supply for external sensors
è
Section 3.2.
The safety function STO is requested solely via the two digital control ports STO-A and STO-B. A safety
circuit for additional interfaces at the CMMP-AS...-M3 motor controller is neither required nor intended.
Cross-circuit detection in the input circuit is not carried out by the safety module.
The status of the motor controller is reported back to an external safety switching device through a
potential-free acknowledgment contact (normally open). This enables a downwards-compatible activa­
tion in a mixed configuration, comprising a CMMP-AS (previous series with the “Safe Stop” function to
be realised via the connection [X3]) and the CMMP-AS-…-M3
è
Section 6.3.
The interface [X40] permits the direct connection of active and passive sensors, since a 24 V supply
voltage (auxiliary supply) with corresponding reference potential is lead out.