Mircom TX3-2000-8U-C - Figure 24 Power Supply

Lobby Control Unit Setup
TX3 Telephone Access System Installation and Operation Manual 45
4.2.7 Power Supply
The power supply connection is situated at the bottom right of the main controller
board and receives 16 Vac, 40 VA. An external PS-4 or PS-4P plug-in
transformer connects to the power terminals. Refer to figure 21 and figure 24.
Figure 24. Power Supply
16 Vac IN
OFF ON
SW2
120 Vac
16 Vac
16 Vac transformer
(PS-4 or PS-4P)
ON/OFF Switch
Note: Use 18 AWG