Festo Контроллеры двигателя CMMS-ST - Manual (Page 94)

4. Functional safety engineering
94 Festo.P.BE-CMMS-ST-G2-HW-EN 1008NH
4.3.8 Explanations of the sample circuit
The circuitry example shows a combination of the CMMS-ST-G2 with a PILZ PNOZ XV2P
safety switch device. An emergency stop in combination with a protective door is drawn as
a switch device. In total, three logic elements can be switched in series. A door position
switch can also be used that keeps the protective door closed until the drive has stopped
or the “Driver supply acknowledgment” signal indicates a safe state and the plausibility
check is successful.
Technical data, such as max. current, etc. can be found in the data sheet of the safety
switch devices.
4.3.9 EMERGENCY STOP request, monitoring of protective
doors
After the Emergency Stop is actuated or the protective doors are opened, the normally
open contact K1 (13, 14) opens immediately. This results in the immediate removal of the
controller release. This introduces the ramp function of the controller. The controller
brakes with the set Quick Stop delay. After reaching a speed of 0, the drive is controlled at
this setpoint value for a parameterisable switch-off delay time (ty). This adjustable time is
the delay required to apply the motor holding brake. This time depends on the holding
brake used and must be parameterised by the user. For applications without a holding
brake, this time can be set to 0.
After this time, the internal end stage enable is switched off by the microprocessor.
After the delay time of the PNOZ has expired, the two delay contacts of K1 (37, 38 and 47,
48) open. Then the driver supply relay and end stage enable are switched off at the same
time.
Note
The ramp function of the motor controller's Quick Stop delay is not
monitored.
The unintended opening of the protective doors must be prevented in the system.
When the PILZ PNOZ XV2P is used, a two-channel operation with cross-circuit recognition
is possible. This permits recognition of:
• Earth faults in the start and initial circuit
• Short circuits in the initial circuit / start circuit
• Cross circuits in the initial circuit.