Samson 3374 Mounting And Operating Instructions page 18

Mechanical limit contacts
Note:

To undo the screws on the housing
cover, use a Pozidriv PZ2 screwdriver
to get enough hold on the screw
heads.
1. Undo screws on housing cover and take
the cover off the actuator.
2. Move the actuator stem to the end posi-
tion depending on the fail-safe action
"Actuator stem extends" or "Actuator
stem retracts". Refer to section 6.
3. Remove serrated ring and shim from
spindle (11).
4. Slide adjustment gears (18) onto their
spindles and fasten with one screw (16)
each. Check whether the adjustment
gears can be turned easily. If not, slightly
loosen its screw again.
5. Turn contact cams (19) on the cam hold-
er (20) as illustrated in Fig. 6 corre-
sponding with the position of the actua-
tor stem.
6. Slide the spacer (8) onto the spindle
(11). Make sure that the long wire of the
tension spring rests on the spacer and on
the intermediate gear.
20
19
Actuator stem
retracted extended
Fig. 6: Alignment of contact cam
and cam holder
18
18 21
When actuator stem retracted
19
Fig. 7: Alignment of the contact cam unit
7. Slide the contact cam unit (21) onto the
spindle corresponding with the position
of the actuator stem as illustrated in
Fig. 7. Make sure that the outermost cog
of the contact cam unit engages in the
gearwheel of the intermediate gear (1).
In addition, the adjustment gears (18)
must engage properly in the correspond-
ing gears of the contact cam unit (21).
8. Secure the contact cam unit (21) and in-
termediate gear (1) with the serrated
ring (3); push down the serrated ring as
far as it will go.
9. Position the terminal board (17) at the
base of the support at a 45° angle (ap-
prox.) with the switches pointing towards
the gears. Swivel the upper end of the
terminal board towards the gears until
the board is in a vertical position and
properly engaged in the support.
10. Adjust limit contacts as described in sec-
tion 7.2.
11. Replace cover. Briefly turn the fastening
screws counterclockwise with a screw-
driver to center them. Then fasten down
the cover by tightening the screws.
1
18 21 1
When actuator stem extended
EB 8331-4 EN