Will Burt Night Scan Chief 1.0, Operating Instructions Manual

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PAGE 45 OF 80
NIGHT SCAN CHIEF
OPERATING INSTRUCTIONS
TP-4602001-T
DECEMBER 2020
Figure 7-1 Diagnostic LEDs (stowed position example)
7.5.2 Adjusting the mast 90° Limit Switch
The 90° Switch (Figure 7-2) senses when the mast is at 90° by checking the position of the actu -
ator. There is a magnet mounted to the actuator arm that triggers the limit switch. When the mast
is being raised from the stowed position and the 90° Switch is sensed, power to the actuator is
removed thus allowing the mast to remain at 90°. The mast will not extend and the RCP will not
function if the mast is not at 90°.
To adjust the 90° Limit Switch:
1. Make certain that the base is level.
2. Remove the two base covers to access the Limit Switches and Base Board.
3. Loosen the lock nuts to adjust the switch position in the slot.
4. Raise the mast to 90° by holding the "Mast Up" button until the mast is at 90°. Do not use the
Auto-Up feature to raise the mast to 90°.
5. Check that the mast is at 90° by using a level, ensuring that the mast is square to the sheet
metal side plate on the base. A value range of 89.5 to 90.5° is acceptable.
6. Adjust the 90° Switch until it senses the actuator. This will be indicated by the diagnostic
LEDs on the Base Board (Figure 7-1).
7. Secure the switch in position using the lock nuts.
8. Raise and lower the mast several times, checking that the mast is plumb each time, and
adjust the switch if necessary. The mast should drive into the rubber pad slightly for stability.