14
d) Rotate the tripping rod 58 at an angle of 90°. As a result, the rod should shift out again. If this is not the case, turn
the screw 56 or 59 by a small amount.
e) Readjust the valve to the OPEN position by the required number of revolutions, making use of the actuator.
f) Depress the tripping rod 58 again in the vertical direction and position it at an angle of 90° on either side.
g) Turn the regulating screw 59 in the direction of arrowhead designated “O”
(OPEN)
till the cam 60 depresses
the spring of microswitch 61
(OPEN position-limit switch PO).
h) Rotate the tripping rod 58 at an angle of 90°. As a result, the rod should shift out again. If this is not the case, turn
the screw 59 or 56 by a small amount.
Note:
Turning the regulating screw 56 or 59 should be stopped at the instant of change-over.
If the cams are in the position shown in Fig.6 before they are adjusted, or the cam has already pressed down
the button of the microswitch, the following procedure is used to advantage:
With the tripping rod 58 depressed and positioned, turn the adjusting screw 56 or 59 against the direction of
the arrowheads till the cam withdraws at its peak from the microswitch lever towards the respective adjusting screw and
the microswitch changes over, which can be checked by a suitable indicating tester. Then, move the cam by turning
the adjusting screw 56 or 59 backwards in the direction of the arrowhead to make the cam peak run back on
the microswitch level till the microswitch changes over again
(with its button depressed).
Thus, the adjusting procedure of
the microswitch has been completed. Finally, shift out the tripping rod 58, as described above.
d) Resistive position transmitter 1 x 100
Ω
This transmitter has one-sided shaft and at its end is fixed a twin wheel 73 composed of gears A and B. The principle
of drive and transmitter adjustment is equal as at current transmitter CPT 1Az. The difference is only in sizes of gears A
and B of twin wheel 73 and as well in the table for working stroke setting.
Resistive position transmitter setting
At the first is necessary to set up suitable gear level from output shaft of actuator to transmitter shaft according to
a required working stroke of actuator – see following table.
Setting will be done using adjust wheel K3 in gearbox of signalling unit according to previous point b).
Then is necessary to slip in to the shot a necessary wheel of twin wheel, which is fixed on transmitter shaft. Wheel with
smaller average is signed as A, bigger wheel is signed as B. Adjustment will be done by moving a pad 72, either under the
transmitter support (in the shot is wheel A) or above the transmitter support (in the shot is wheel B). This will be done in
a position, when the transmitter support is most away from gearbox. Then screws fixing transmitter support must be slightely
tighten, so that it is possible to move transmitter support to the position, when wheel A and B is in the shot with driving wheel.
We will check shot of wheels in this position. Between wheel A (event. B) and driving wheel must be slight will for not to be
a transmitter shaft tried in perpendicular direction on its axis. Then we will tighten properly by fixing screws of transmitter
support and and ensure by a varnish. If required working stroke is in overlap of two bands, is more suitable to choose lower band.
Fig.7 -
Operating diagram of position-limit switching and signalling switches
Numbers of terminals
Open
Close
on terminal board
PO
15-16
14-15
PZ
18-19
17-18
Open
Close
SO
21-22
20-21
SZ
24-25
23-24
Contact open
Contact closed
