13
48
47
49
52 442
52 443
I.
10 - 12,5 mm
-
II.
12,5 - 52,5 mm
20 - 66 mm
III.
52,5 - 100 mm
66 - 120 mm
Actuator Type No.
- Adjustment range of working stroke
Gear
change step
Table for setting the working stroke of the gearbox
of the signalling unit
48
47
49
Output shaft Gearbox
Cams
Fig.5 -
Kinematic diagram of gears
Legend:
K 1 – Gear
K 2 – Drive gear
K 3 – Adjusting gear
47 – Lock screw of adjusting gear
48 – Camshaft
49 – Pinion with friction clutch
Caution!
After any manipulation of the lock screws in the control section of the actuator, these screws should be secured again-
st loosening due to vibrations by a drop of quick-drying varnish. If the screws have been secured previously in this way
then, during adjustment, varnish residue should be removed and the surface under them should be properly degreased.
c) Position-limit switching unit (Fig. 6)
This unit causes the CLOSE or OPEN position-limit switch
(PZ or PO)
to open when the preadjusted RPM of the
output shaft are reached, the rotary motion of the unit being derived from that of the output shaft by means of the drive
wheel 62. This wheel is rotated step by step by gear wheels driving cam 57
(60).
Turning of the cam up to the lever
of the CLOSE or OPEN position-limit switch
(PZ or PO)
causes the switches to change over.
Handling and setting
The unit can be adjusted within the range of 10 to 100 mm
(Type No. 52 442)
and 20 to 120 mm
(Type No. 52 443)
of the working stroke of the actuator.
The adjusting procedure is the following:
a) After attachment of the actuator to a valve, bring the actuator with the valve into the CLOSE position.
b) In this position, depress the tripping rod 58 in the vertical direction and then rotate it through an angle of 90° to
the left or right.
c) Turn the adjusting screw 56 in the direction of arrowhead designated “Z”
(CLOSE)
till the cam 57 depresses
the spring of microswitch 63
(CLOSE position-limit switch PZ).
Diagram of microswitches
Legend:
55 – Decadic transmission gearing
56 – CLOSE adjusting screw
57 – CLOSE tripping cam
58 – Tripping rod
59 – OPEN adjusting screw
60 – OPEN tripping cam
61 – OPEN position–limit microswitch (PO)
62 – Drive gear
63 – CLOSE position–limit microswitch (PZ)
Fig.6 -
Position-limit switching unit
(the encircled numbers correspond to the
numbers of terminals on the terminal
board of the actuator.)
55
56
57
58
59
63
62
60
61
19
17
18
16
14
15
