4. Functional safety engineering
84
Festo.P.BE-CMMS-ST-HW-EN 0903b
The controller state accordingly depends on the programmed error reaction for the error
020 (undervoltage in intermediate circuit).
When the PILZ PNOZ XV2P is used, a two-channel operation with cross-circuiting
recognition is possible. This makes it possible to recognise earth faults in the starting and
initial circuit, short circuits in the initial circuit / starting circuit, cross-circuiting in the
initial circuit.
Warning
The series-supplied motor holding brake or an external motor-
holding brake controlled by the drive controller is not suitable for
protecting people.
Provide additional support to protect vertical axes from sliding
down when the motor is switched off as follows:
- mechanical locking of the vertical axis,
- external braking/ safety catch/ clamping device or
- adequate weight compensation of the axis.
Note
If EMERGENCY STOP is requested, the external brake is immedi-
ately switched on, if needed.
Note
The holding brake of the EMMS-ST-…-S
B
/-SE
B
is not suitable for
braking the motor and does not provide a safety function.
Restoration of normal operation
Before switching it on again, make sure that all hazards have been eliminated and the
equipment 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.
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
end stage enable and controller enable must be checked regularly (e.g. monthly) via the
PLC.
