Stewart Filmscreen Corp LCD Front Projector - Manual (Page 9)

ABT-EM Trapdoor ElectriMask Electriscreen: Owner’s Manual 7
Installing the low-voltage 3-button switches (horizontal)
There are three low-voltage controls mounted on a board. Each low-voltage
control allows the use of low-voltage wire to connect to the supplied 3-
position 24V momentary wall switch. The top low-voltage box controls the
mask, the middle box controls the screen, and the bottom box, nearest the
J-boxes, controls the door. Refer to Figure 5.
Note: The board can be mounted near the screen, or by adding extra
cable, you can mount it farther away.
Preparing the connection
Before making the electrical connections, you need:
‹ An available AC constant power source
‹ A 4-conductor switch hook-up cable (4-conductor bell wire or
category 5 cable is typically used for long runs)
‹ Cat 5, multi-conductor unshielded, or similar type electronic cable
can be used to connect the 3-button switch to the LVC. The
recommended wire gauge is 20 to 24 AWG. Use plenum-rated
cable when required.
Making the connection
Figure 6, on the following page, illustrates the connections.
Note: The electrical housing has a 2-gang J-box. For a top view, refer to
Figure 4.
1. Connect the 8-conductor cable to the connection harness coming
from the J-box labeled “switch input” on the screen unit.
Note: Use a longer cable to mount the low-voltage control board
further from the screen unit.
2. Connect the 4-conductor cable to the connection harness coming
from the low-voltage control board.
3. Connect the hookup cable to the 3-button switch.
4. Connect the main AC power source to the the low-voltage board.
5. Connect the main AC power source to the the J-box labeled
“main AC power connection” on the screen unit.
6. A parallel connection to an outboard audio-visual switching
network can be made at this time. (optional)
Caution
Refer to the First Time
Activation note in the
section “Operating the
Screen.”