VAT 651 Series - Page 79

Series 651 MAINTENANCE
605451EC Edition 2014-07-10 79/
99
Description
Required tool
6. With one hand press the
[Maintenance button] to lower the
sealing ring, with your second hand
unlock the sealing ring by pressing
the handle.
7. Release [Maintenance button].
8. Remove sealing ring.
9. To prevent the shaft and retaining
pins from moving during work,
switch the valve to safety mode.
Refer to «Safety mode» for details.
Retaining pins will move up.
Maintenance button
10. Release the valve from safety mode.
Refer to «Safety mode» for details
11. Move the valve to position 50% (half
opened) This is necessary, in order
to dismount the actuator. See steps
19 to 21.
12. Disable PFO option feature via
'Power Fail Status' in menu 'System'
of CV or CPA software, and turn off
the power
• CV software
• CPA software
or
• Service box 2
13. Disconnect 24VDC power. Wait for
60s, then disconnect cables and
compressed air from valve actuator.
14. Unfasten all 4 controller screws and
lift the controller carefully from
actuator.
Allen wrench 4 mm
unlock
lock