GEA FLOWVENT, Инструкция по эксплуатации, Страница: 53 / 84

Hint!
When the colours are swapped, the feedback signals are also
swapped!
Checking the Control Top
Carry out the following steps:
8. Activate the solenoid valves in succession via the PLC in order to check the
proper function of the FLOWVENT Control Top feedback signals.
9.
The I/O test can take place parallel to commissioning.
®
This completes commissioning.
7.4 Service Function
Caution!
Spring tension on the process valve
When disassembling spring-closing process valves, there is a risk of injury
as the released spring preload raises the actuator abruptly.
► Release the spring tension.
If maintenance must be conducted on a process valve that is fitted with a control
top FLOWVENT Control Top, the valve core must be pulled out of the housing.
For this purpose, the valve disk pretension of the process valve must be relieved
by actuating the main actuator through the PLC control.
Another option, when the cover is removed, is manual operation at the pilot valve,
see Section 3.2.3, Page 20
Hint!
For process valves with air-assisted actuator spring, both pilot valves
(NC and NO) must be manually operated using a screwdriver to
release the valve disc preload!
If there is no manual operation at the pilot valve Y2 (NO), the end
position must be activated by the superimposed control!
Start-up
Service Function
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