Samson 3274 - Adjusting the Limit Contacts

EB 8340 EN 7-7
Start-up
7.4 Adjusting the limit contacts
A limit contact consists of a changeover switch, which changes its switching position when a
contact cam presses the switch downward. Turning the contact cam to continuously adjust the
switching range over the travel range as required.
Mechanicallimitcontact:
1. Move the actuator stem to the position at which the limit contact is to switch.
2. Makeneadjustmentbyturningtheadjustmentscrewatthecontactcam.
3. Check the switching point by stroking the actuator.
Inductivelimitcontact:
1. Move the valve to the position at which the switching point is to be activated.
2. Turn the adjustment screw until the tag triggers the contact.
3. Check the switching point by stroking the actuator.
Contact cams
Mechanical limit contact Inductive limit contact
Metal tag Proximity switch
Switch
(not in view)
Roller
Adjustment screw
Adjustment
screw
Clamping screw
Fig.7-2: Limit contacts