Adjusting The Limit Contacts - Samson 3274 Mounting And Operating Instructions

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 fine 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 Roller
Adjustment screw
Mechanical limit contact
Fig. 7-2: Limit contacts
EB 8340 EN
Switch
Metal tag
(not in view)
Adjustment
screw
Proximity switch
Clamping screw
Inductive limit contact
Start-up
7-7