Festo Контроллер двигателя CMMD-AS - Manual (Page 87)

4. Functional safety engineering
Festo P.BE-CMMD-AS-HW-EN 1002NH 87
1. Switch-off path: Output stage enable via [X1.1/2] (blocking of the pulse-width
modulation signals; the IGBT drivers are no longer actuated with
pulse patterns).
2. Switch-off path: Interruption with a relay of the power supply to the 6 output stage
IGBTs via [X3.1/2]. (The IGBT optocoupler drivers are removed from
the power supply by means of a relay, thus preventing the pulse-
width modulation signals from reaching the IGBTs).
A plausibility check between the relay control for the end stage
driver supply and the monitoring of the driver supply is performed
by the microprocessor. This is used for error detection of the
impulse block and also for suppressing error message E 05-2
(Driver supply undervoltage) which occurs in normal operation.
Potential-free
acknowledgment
contact:
The integrated circuit for the STO function also has a potential-free
acknowledgment contact (X3.1/2] pins 5 and 6) for the existence
of the driver supply. This is an N/C contact. It must be connected to
the higher-order controller, for example. The function of switching
off the end stage enable must be checked regularly via the PLC
(e.g. monthly; contact open = driver supply available).
If an error occurs in the plausibility check, the control system must
prevent further operation, for example by switching off the
intermediate circuit voltage or breaking off the output stage enable
by the PLC.
4.3 Integrated function "Safe Stop 1" (SS1)
4.3.1 General remarks/description "Safe Stop 1" SS1
In the SS1 function, the drive is run down in a controlled way and, after that, the power
supply to the final output stage is switched off. As a result, the drive cannot generate
torque or any force at standstill and so cannot make any dangerous movements.
Warning
For use of the SS1 function in the CMMD-AS, both plug connectors
[X3.1] and [X3.2] must always be connected in a manner conforming
to the documentation. If only one plug connector [X3.1] or [X3.2] is
wired, when the SS1 is demanded, only the corresponding power
output stage is securely switched off (as depicted in chapter 4.3.6
“Sample circuit SS1").