1
2
Horizontal Mask
3
4
Vertical Mask
Screen
5
Horizontal Mask
6
Figure 15: DOWN limit switches are 2, 4, and 5.
Modifying the extension of the mask
You can increase the extension of a mask up to 3" / 7.6 cm past the factory preset stop, or you can decrease the extension from the factory preset stop. Do not attempt to modify a mask extension beyond these recommended amounts.
The limit switches are located on the head of the motor and can be accessed through openings located on the left side of the frame, as shown in Figure 15.
Horizontal mask units have limit switches at the top and bottom of the frame, a set for each roller tube.
Warning
The UP limit switch(es) retract the batten(s) further into the unit. Adjusting them is not advised. Refer to 1, 3, or 6 as appropriate in Figure 15.
To increase a mask's fully extended (mask down) stop position:
1.Lower the mask to its current stop position.
2.Locate the down limit switch(es) located on the left side of the frame. Refer to 2, 4, or 5 as appropriate in Figure 15. Use a screwdriver to turn the switch in a counterclockwise direction. If the power is on, the mask will drop incrementally as the switch is turned.
Note: One complete turn of the switch will make approximately a 1/2" / 1.3 cm change in the mask’s stop position.
To decrease the mask extension:
1.Lower and stop the panel when it is extended about halfway down.
2.Locate the down limit switch(es) located on the left side of the frame. Refer to 2, 4, or 5 as appropriate in Figure 15. Use a screwdriver to turn the switch in a clockwise direction.
Note: One complete turn of the switch will make approximately a 1/2" / 1.3 cm change in the mask’s stop position.
3.Activate the mask in the down direction until it reaches the newly reduced stop position. Repeat this procedure until the desired stop position is reached.
Once you have made the adjustment, whenever you lower the mask, it will automatically stop at the new position.
Note: It is recommended that you make a note of any changes made to the factory preset.
18 | Stewart Filmscreen Corporation |