Emergency Locking
The key parts for the vertical sensor are identified in the picture below:
The motor is at 'A' in the left-hand picture. In the right-hand picture, B is the locking
pin and C is the supplementary gear-train.
To drive the motors, apply 5V DC power directly to the wires where they are soldered
to the motors and observe the operation of the locking mechanism. When the
locking pin is fully extended, the mass will be clamped. This can be verified by
gently attempting to move the mass. If any motion is observed, repeat with the
polarity reversed to drive the motors in the opposite direction.
3.4 Manually driving the mass-locks
If the motors or gearboxes have failed, it may not be possible to electrically lock the
masses. In this case, the mechanisms will have to be manipulated manually.
Access to the North/South sensor component is severely restricted by the location of
the East/West sensor component. It is advisable to first lock the East/West sensor
component and then physically remove it before addressing the North/South sensor
component.
13
Issue B - January, 2017
