Festo Контроллеры двигателя CMMS-ST - Manual (Page 95)

4. Functional safety engineering
Festo.P.BE-CMMS-ST-G2-HW-EN 1008NH 95
Warning
The standard motor holding brake or an external motor holding
brake controlled by the drive controller is not suitable for
protecting people.
• Vertical axes must be additionally secured against falling or
sliding down when the motor is switched off with, for example,
- mechanical locking of the vertical axis,
- external braking, safety catch or clamping devices or
- sufficient weight compensation of the axis.
Note
If EMERGENCY STOP is requested, the external brake is
immediately switched on, if needed.
Note
The holding brake of the EMMS-ST-…-SB/-SEB is not suitable for
braking the motor and does not have a safety function.
Note
The time delay of the PNOZ relay must be adjusted for the
application (see
4.3.13). If this time delay is set too low, the drive
performs an STO function when the time has passed and the brake
will be worn.
4.3.10 Restoration of normal operation
Before switching it on again, make sure that all hazards have been eliminated and the
system can be safely placed in operation again. If there are areas inside that can be
entered, a manual acknowledgement must be made via the optional S2 button.
4.3.11 Testing the safety function
For each on-off cycle of the machine, the PILZ device PNOZ XV2P checks whether the
relays of the safety equipment open and close properly. The function of switching off the
output stage enable and controller enable must be checked regularly (e.g. monthly) via
the PLC. In addition, the “Acknowledgment of driver supply” signal must be checked for
plausibility.
4.3.12 Determination of the brake time
The brake time can easily be determined through the FCT Trace function. The brake time
can vary greatly due to different loads. Determine the values for the maximum brake time.
To do this, input the following settings under the point “Configure measurement data”.