Main System Components; Control Unit - Tunstall Communicall Vi IP Manager User Manual

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2. Main System Components

Control Unit

The Control Unit (CU) functions to control the flow of electronic signals through the system
and provides the low voltage electricity supply for most of the equipment. The unit also
incorporates a backup power supply that will keep the system operational, for more than 7
hours following a failure of the mains supply. As a rule, the CU does not require any attention.
However, it may become necessary to restart the CU should power be lost for any reason.
The CU control panel and instructions for turning the unit on are described below.
Mains switch
Battery indicator
Battery switch
Turning the Control Unit on
The control unit has two controls: a mains power switch and a battery in circuit switch. Under
normal circumstances both switches should be on and illuminated. If either switch is in the off
position, the unit must be switched on in the following way:
1. Put both switches into the off position (this turns the control unit off).
2. Press the mains power switch to on (down towards the "1" mark). The switch will
illuminate.
3. Press the battery switch to on (down towards the "1" mark), the red light will turn on.
4. The system is now powered.