TMQ Bosun-AP9, Operation And Installation Manual

Page: 38 / 63

TMQ Bosun - AP9 Rev1 (935) Page 38 16/06/2003
External Alarm
An external buzzer may be connected to the internal 2-way terminal strip
(T6), terminals
10 V and AL (EXT AL).
The AL output will be 10 volts when the alarm is not sounding (with alarm
connected), and approximately 0 volts when active. TMQ recommends a
12-volt piezo buzzer with maximum current draw not exceeding 250
milliamps be connected to this output.
If a larger type siren or alarm unit, which draws in excess of 250 milliamps
is used, this must be connected via a relay. The AP9 external alarm circuit
is used to energise the relay coil and power to the siren or alarm unit is
connected via the relay contacts.
The external alarm output is activated if the stopwatch timer or commercial
alarm has been sounding for longer than one minute.