Connect Ac Power - Mircom TX3-BBCX-4W Assembly

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GROUND
1. Make sure that the power is off .
2. Attach one end of the supplied 14 AWG wire to the
chassis ground terminal and connect the other end to
the site ground (water pipe).
Figure 3: Chassis ground
Documentation is subject to change without notice. See
http://www.mircom.com/tx3 for the latest version of this document.
Mircom technical support: 1-888-647-2665
MOUNT THE MD-990
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POWER SUPPLY
The power supply enclosure is shown in Figure 4 (for clarity
the power supply is not shown).
1. Find a suitable location for the power supply enclosure,
such as over a wall stud.
2. Using the power supply enclosure as a template,
mark the back mounting hole locations as indicated
in Figure 4. Ensure that at least one side is over a wall
stud.
3. Remove the power supply enclosure and place two
screws halfway into the top marked hole locations and
wall stud.
4. Place the power supply enclosure onto the two screws.
5. Screw two screws into the bottom holes.
6. Tighten all four screws into place.
Chassis
The enclosure can also be mounted directly onto the drywall
Ground
using anchors.
Figure 4: Power supply enclosure
TX3-BBCX-4W Assembly
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CONNECT AC POWER

1. Make sure that the power is off (the On/Off Switches
on the card access controllers are off ).
2. Connect the MD-990 load power supply wires to the 16
VAC IN terminals on the fi rst card access controller.
3. Connect the other card access controllers to the fi rst
one in parallel (daisy chain).
4. Connect the building power supply wires to the MD-
990 line terminal screws as shown in Figure 5.
5. Connect the other end of the building power supply
wires the line voltage terminals.
To building To 16 VAC IN
power on card access controller
Figure 5: Terminal block wiring
LT-1182 rev 1.2 Page 5 of 6