GEA VARIVENT 24/7 PMO, Руководство по эксплуатации, Страница: 49 / 108

8 Operation and control
8.1 Safety instructions
Dangerous situations during operation can be avoided by safety-conscious and
proactive behaviour of the personnel.
For operation, the following principles apply:
• Monitor the component during operation.
• Safety devices must not be changed, removed or taken out of service. Check
all safety devices at regular intervals.
• All guards and hoods must be fitted as intended.
• The installation location of the component must always be properly ventilated.
• Structural changes to the component are not permitted. Report any changes
to the component immediately to the person in charge.
•
Always keep danger zones clear. Do not leave any objects in the danger
zone. Only allow persons to enter the danger zone when the machine is de-
energized.
•
Regularly check that all emergency stop devices are working correctly.
8.2 Feedback system / signal analysis
Hint!
The purpose of the proximity switch is to monitor the double-disk idle
position during the idle position of the valve and when lifting the seat
of the valve disk.
When the main stroke is actuated, the signal of the proximity switch
S3 is not relevant and does not need to be analysed from a process
aspect.
The feedback of the end position of the valve (main lift) is sent to the
PLC via the S2 signal.
Overview of the feedback signals
Feedback system Activation Electric feedback
Solenoid valve Signal
Y1 Y2 Y3 S1 S2 S3 S4
Start position Valve closed 0 0 0 1 0 1 1
End position Valve opened 1 0 0 0 1 0 0
Seat lift Lower valve disk 0 1 0 0 0 1 1
Seat lift Upper valve disk 0 0 1 1 0 0 1
®
Analysis S4 available for T.VIS A-15.
®
The double-disk is queried via S3 when the seat of the valve disk is cleaned.
Operation and control
Safety instructions
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17.04.2023 49