Will Burt Night Scan Chief Installation, Operation & Maintenance Manual page 34

Adjusting the Magnetic Switch
The Magnetic Switch is located on the mast base tube. In the Night Scan Chief, the magnetic switch
senses a magnet located in the top tube and serves to indicate that the mast has exhausted all air and
that it is safe to nest into the saddle. If the switch is out of adjustment, it will prevent the mast from
nesting to the saddle from the 90 degree position. It is important that the mast has properly nested
by verifying that the collars are stacked with no gaps between them. If the collars are not properly
stacked see Table 4-5 for further instructions. If the switch is found to require adjustment, it will most
commonly need to be moved upward (toward the RCP) on the mast. The magnet is located at the lower
end and side of the top tube. It is not visible outside the mast.
The following procedure must be followed to adjust the magnetic switch.
1. Loosen the band clamp securing the switch to the base tube. Move the switch up approximately 1/8"
and tighten band clamp.
2. Initiate the mast, if necessary, and press the down button the hand held remote. If the mast does not
nest, repeat the adjustment until it does. A small piece of steel or iron filings may be used to help
locate the magnet.
3. If repeated attempts do not succeed, hold a magnet up to the switch and press the down button. If
the mast begins to nest, continue repeating the adjustment until the switch has sensed the magnet.
4. If the mast will not nest when a magnet is held to the switch, check the wiring to the circuit board for
loose or disconnected wires. See schematics in section 4.4. If the wiring is intact, replace the
magnetic switch.
Resetting the RCP Home Position
The Chief unit is shipped with the lights in home position. Home position is established by setting small
flags in the RCP that engage photo interrupters on the RCP board. It orients the lights such that the light
bars are parallel to the axis of the mast and are facing downward when nested. On all models, the RCP
shafts should contact the saddle simultaneously during nesting when correctly set. It should be noted
that having the RCP covers off could cause improper RCP operation when outdoors. This procedure
should be performed indoors. To set the home position, the following procedure must be observed.
1. DISCONNECT ALL AC POWER TO THE CHIEF!
2. Initiate the mast and raise it to the 90-degree position. The hand held remote should show both left
and right tilt up functions are available and the pan left function is available.
3. Remove the RCP covers to access the flags.
4. Refer to Figure 4-3 for reference. The flags are attached to the timing rings on the horizontal and
vertical shaft gears.
5. Once the set screws are loose, pan and tilt the unit to the correct home position. Be careful that the
flags do not come into contact when panning and tilting, they may become bent.
6. It is important that the flags engage the correct photo interrupter when setting the home position, see
Figure 4-3. Turn the timing ring on the right horizontal shaft such that it rotates down toward the
upper photo interrupter. As you approach the interrupter, watch the wired hand held remote. As
soon as the tilt down LED goes out, stop rotating the ring and tighten the set screw. To set the pan
home position, turn the timing ring counterclockwise (looking from above the RCP) until the pan right
LED goes out. Tighten the adjustment screw to secure the ring.
7. Pan and tilt the unit until the second set screw in each ring is accessible and tighten.
8. Stow the mast, watching for the lights to be oriented as described in the beginning of this section.
Revision 1
Night Scan Chief
4-4