50 Installation TB7100 Installation and Operation Manual
© Tait Electronics Limited December 2005
4.8.3 Power Supply Options
The base station is available with or without an internal AC power supply 
unit.
All base stations have an external DC input power connector which is used 
as main power supply when no internal AC power supply unit is fitted.
When the internal AC power supply unit is fitted, the DC input can be used 
as a DC backup power option. In case of AC mains failure the base station 
will automatically and seamlessly switch to DC power input.
If no internal AC power supply unit is fitted, an external Tait T809-10-87xx 
power supply can be used to supply the DC voltage required.
4.8.4 Setting the AC Mains Input Voltage
Warning!! The internal AC power supply unit contains 
voltages that may be lethal. Refer to the ratings 
label on the rear of the base station.
Ensure that all power sources (AC and DC) are disconnected 
before opening the base station.
1. Disconnect all power sources before opening the base station.
2. Use a Torx T10 screwdriver to remove the 15 countersunk screws 
securing the cover to the tray.
3. Set the 115V/230V AC mains voltage selector switch to the correct 
AC mains input voltage (Figure 4.3).
Figure 4.3 115/230V AC mains voltage selector switch
115/230V AC mains 
voltage selector switch