User's Manual

AC2000 Getting Started Guide
17
3.4.2 Wiring a voltage not provided lock (external power)
Important
When using 24V power for a lock, it is imperative that the switch position is set to EXT. Setting the switch to INT
will result in 24V being supplied to the terminal which may cause irreversible damage.
This is the recommended wiring configuration when locks require 24V or more than 650mA.
Figure 13 Illustration of wiring for lock with external power provided
3.4.3 Output power switch
Each of the two outputs has a switch that allows power to be provided to the output from the
terminal’s internal power circuit or by an external power source.
External power
When the switch is set to EXT a separate DC12 - 24V power source must be used to provide
power for any locks or other devices such as sounders attached to the output.
Internal power
When the switch is set to INT, DC12V 650mA max current in total is provided to the lock or
other devices attached to the outputs from the terminal’s internal power circuitry.
Important
The terminal’s 12V connectors all link to the same circuit, powering the terminal and any outputs set to INT. It is
imperative that before attaching 24V to power an output checks should be made that the relevant output switch is
set to EXT. Applying 24V to an output with the switch set to INT will result in 24V being supplied to the common
power circuitry, potentially damaging the terminal.
3.4.4 Inputs not in use
Some inputs must be linked out when not in use, to prevent alarms being generated on the
system. These are:
• Input 0 - door position sensor
• Fire input on a Door Interface Unit
• Tamper input on a Door Interface Unit
• Break Glass input on a Door Interface Unit