23
DRIVE PLATE SET—UP AND ADJUSTMENT
After completing the necessary electrical and pneumatic connections, the header drive plate can be adjusted
for proper operation. The following procedure should be followed to ensure the correct operation of the drive
system.
CAUTION:
The air cylinder is ca-
pable of producing several hundred
pounds of force, use extreme caution
when test operating the door system.
1. With the air pressure off of the
door system, rotate the bell
crank assembly to the position
shown in figure 2.
2. Adjust the tie rod for the right-
hand panel to 200 mm (7.87")
from center to center of the rod
ends.
3. Install the right-hand crank
arm onto the splined shaft.
4. Adjust the left-hand (spring
loaded) tie rod to 515 mm
(20.28") from center to center of
the rod ends in the collapsed
position.
5. Install the left hand crank arm
onto the rotating column spline shaft.
6. Operate the door by hand and check for any interference.
7. Apply air pressure to the system and turn the emergency valve counterclockwise.
8. With the cylinder in the extended position, adjust the tie rods to bring the panels to the fully closed
position.
9. Cycle the door open and check the panel position. The panels should be perpendicular to the bus
sidewall.
A.
If both panels are out of position by the same amount, adjust the bell crank stop to correct.
B.
If one panel fails to open completely, remove the crank arm from the opposite side and rotate
outward (away from the center of the drive plate) one tooth on the spline shaft. Cycle the door
closed and readjust the closed position.
10. Recheck door operation and readjust, if necessary.
11. Tighten the crank arm clamps, tie rod jam nuts and any other fasteners that may have been loosened
during the setup adjustment.
SPEED AND CUSHION ADJUSTMENT
1. Adjust the door speed by turning the appropriate (see figure 1) flow control valve clockwise to reduce
speed and counterclockwise to increase speed. Cycle time (opening or closing) should be approxi-
mately two seconds to minimize wear on door components.
2. The door cylinder is equipped with an adjustment to set the cushioning that occurs at each end of
stroke. This slows the system as the panels approach the fully open or fully closed positions and
therefore prevents the door from slamming against the open stops or the portal as it closes. The
adjustment is made by turning the adjustment screws (see figure 1) in to increase cushioning and out
to decrease cushioning.
30mm
1.2"
FIGURE 2
