18
March 2022
Installation, Operation and Maintenance Manual
MAN 707 Rev. 3
Section 3: Operation and Use
Operation and Use
3.5
Calibration of Microswitches
(*For Biffi Limit Switch Box)
NOTICE
Operate only the microswitch corresponding to the direction of operation being carried
out, as clearly reported on the microswitch.
!
WARNING
*For information only: If different microswitches assembly or limit switch box is supplied,
please refer to the specific documentation.
Microswitches are placed inside a special box (Figure 15).
For microswitches calibration, please refer to the relative wiring diagram and follow
these steps:
•
Unscrew the fastening screws of the cover (Figure 15).
•
Remove the cover, paying attention not to deteriorate the gasket and the
cylindrical and flat coupling surfaces.
•
Operate the actuator (in opening or closing) with local hydraulic operation
(Section 3.3).
•
Unscrew the screw of the operating cam relative to the microswitch to calibrate
and adjust it according to the settings (Figure 16).
•
Tighten the screw.
•
Operate the actuator and adjust any other microswitch with the procedure
already described.
•
Position the cover making sure the cam-carrier shaft grips with the index
dragging shaft.
•
Check that the cover and the index show the proper position of the valve
(Figure 17).
•
Tighten the screws.
