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3.5 Electronic Control System
(See Parts Location Diagram on Page 8)
The electronic control system consists of a solenoid (23) and printed wiring board (30),
etc. Depress the start button (5A) to bring the solenoid into action. The pneumatic
cylinder (8) starts to empty, and the indicator light for loading (1A) is lit. The piston rod
(6) descends, dropping the fork rocker (5) slowly downward and the roller is separated
from the large lever. The piston rod is stopped and the electronic face plate light for
test duration (2A) is lit as the load is applied. When the duration time (12, 30 or 60 sec-
onds) is completed, the pneumatic cylinder (8) reverses the process by means of the
solenoid. The electronic faceplate light for unloading (3A) is lit and the piston rod raises
the large lever again. When the roller at the end of the Fork Rocker comes into con-
tact with the limit switch (2) at the rear of the Large Lever (4), the pneumatic cylinder is
stopped and the test force is removed.