Start-Up; Adjusting The Limit Contacts - Samson 3374 Mounting And Operation Instructions

6 Start-up

Once the actuator has been mounted cor-
rectly and the wiring has been performed as
described in the 'Installation' section, the
electric actuator is ready for use and can be
controlled by a three-step signal according
to the technical data (see the 'Design and
principle of operation' section).

6.1 Adjusting the limit contacts

1. Unscrew screws on housing cover and
take the cover off the actuator.
2. Connect supply voltage.
19
Actuator stem re-
tracted
Fig. 6-1: Contact cams and cam holder
Fig. 6-3: Terminal board · Limit contact (17)
EB 8331-3 EN
20 19
Actuator stem
extended
3. Use the motor or manual override to
move the actuator stem to the point at
which the contact should react.
4. Use the 4 mm hex wrench to turn spindle
of the adjustment gears (18) for the up-
per limit contact or for the lower limit
contact until the associated contact cam
on the cam holder (20) triggers the
switch contact of the upper or lower mi-
croswitch on the terminal board (17).
5. Replace cover. Briefly turn the fastening
screws counterclockwise with a screw-
driver to center them. Then fasten down
the cover by tightening the screws.
18 21
When actuator stem retracted
18
When actuator stem extended
Fig. 6-2:
Contact cam unit
1
18
19
20
21
Start-up
1
21 1
Intermediate gear
Adjustment gear
Contact cam
Cam holder
Contact cam
6-1