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12
5 SETTING OF MECHANICAL STOPS AND TRAVEL
LIMIT SWITCHES
Mechanical stops description and function (1/4 Turn only):
These items avoid any over-travelling during handwheel operations.
The stops can be positioned either on the actuator itself or on the 1/4 Turn
worm gearbox if any.
Actuators and gears are supplied and tested for a 90° operation.
Fine adjustment of the stop screws position is possible within a limit
of ± 2° maximum.
Travel limit switches description and function:
The cams operating the limit switches are on a cylindrical block which
does not require any disassembly. Each cam can be set independently of
the others. The white and black cams are for open and close travel limits.
The other ones are for additional limit switches for signalisation (2 or 4).
How to operate the cams:
a) Put a screwdriver in the slot of the button encircled by the same
color as the cam to be set,
b) Press lightly to disengage the cam of locked position,
c) By turning the screwdriver rotate the cam to the position in which
it can trip the limit switch,
d) Remove screwdriver and ensure that the button has come back to
its original position, thus locking the cam in chosen place.
Procedure of mechanical stops and travel limit switches setting:
a) Loosen stop screws by 2 turns.
b) Manually drive the valve to the closed position. If mechanical stops
are reached before the valve closing is completed, it means that the
2° maximum adjustment tolerance has been exceeded ; do not try
to go beyond this limit.
c) Set the cam of the «CLOSED» travel limit switch.
T
d)
urn stop screws clockwise to the mechanical contact, reloosen
1.5 turn, and secure by lock nut.
Proceed in the same way in open position.
Perform complete electrical valve opening and closing operations.
It is mandatory that the motor stops on the travel limit switch and not
on the mechanical stop (check available extra travel to the stop with
handwheel).
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