Adjusting The Limit Contacts - Samson 3274 Mounting And Operating Instructions

Operation

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. Turn 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:
For the operation of inductive contacts, isolating switch amplifiers according to EN 50227
must be installed in the output circuit.
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. 10: Limit contacts
28
Switch
Metal tag
(not in view)
Adjustment screw
Proximity switch
Clamping screw
Inductive limit contact
EB 8340 EN