11
Fault LED
– The siren amplifier has a fault LED incorporated into the front panel to aid debugging and
troubleshooting of any detected faults. The LED will flash in different patterns to identify a particular
fault as shown in the table below. The fault light should be treated as a warning of improper operation
and possible causes should be investigated.
Flash Pattern
Detected Fault
Steady on
Short circuit on speaker detected
Steady flashing (on, off)
Over heated
Two flashes with a pause
Under voltage
Three Flashers with a pause
Over voltage
Four flashes with a pause
Over current, or short circuit
Circuit protection
– The siren amplifier has the following protective circuitry incorporated into it to
ensure that fitting error don’t cause damage to the siren or vehicle systems as well as:
Start delay
– the siren will not work for several seconds after power is first applied to the
siren amplifier, to allow voltage to stabilise after engine started, stopping damaging voltage
transients effecting the speaker.
Reverse Polarity protection
– if the positive and ground lines have been reverse wired the
siren will not function, however the siren amplifier and speaker will not be damaged by this.
Over temperature protection
–
In the event of the siren overheating through excessive
prolonged use or extreme ambient temperatures. The siren will switch off the siren output
until it has cooled sufficiently to resume operation.
Over current protection
– if the siren amplifier circuit is drawing too much current, caused
by a speaker failing or short circuit, the siren will switch off the siren output. The power to
the siren amplifier will have to be reset to clear this fault.
Speaker short circuit protection
– if a short circuit is detected on the speaker the siren
output will switch off. The power to the siren amplifier will have to be reset to clear this
fault.
Over and under voltage protection
– if the operating voltage is out of operating parameters
for the voltage version of the siren, the siren will not operate. i.e. when 12V siren fitted to
24V vehicle or if the vehicle battery is flat.
D00217-00-A
REL: 39983
