Premier Hazard 9004 - Product Features; Horn Polarity Detection; Circuit Protection Features

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Features:
Horn polarity detection – The siren amplifier detects if the horn is positive switched or negative
switched on start up. The HRT wire (pin 9) should be connected to the switched side of the horn (see
page 9 for full details).
Data output – This provides a 200mA positive output feed that can be connected to a data logger, the
data output is switched on when the siren is sounding and operating correctly.
Relay output – This provides a 200mA positive output feed that can be used to connect to a separate
relay (available separately) so that the Horn can be bypassed when the siren is operating.
This output is active when either the tone is sounding or when the run input is selected (see page 9 for
an example of the wiring).
Fault LED – The siren amplifier has a fault LED incorporated into the front panel to aid debugging and
trouble shooting of any faults. The LED will flash in different patterns to identify a particular fault (see
page 11 for fault codes and troubleshooting).
Circuit protection – The siren amplifier has the following protective circuitry incorporated into it to
ensure that fitting errors don’t cause damage to the siren or vehicle systems as well as:
 Start delay – the siren will not work until three 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.