Bosch Security Systems | 2006-11 | 9922 141 50751en
Plena Power Amplifier
| Installation and User Instructions | Supervision
en
| 17
4
Supervision
Supervision is provided for:
•
Pre-amplifier and power amplifier function
•
Battery and mains supervision
Relays are provided on the rear panel for the each
supervised function and are normally energized (fail
safe). Each relay has 3 contacts, normally open,
common and normally closed.
If an application does not need supervision, the
indicators on the front panel can be set to OFF with the
switches next to each relay output. The relays always
function and are independent of the indicator switch
setting.
4.1 Input
pilot
tone
The pilot tone of 20 kHz at -20 dBV supervises the pre-
amplifier, the connections between the pre-amplifier
and the power amplifier and function of the power
amplifier. If the input signal from the pre-amplifier
stops, the mains and battery fail or the power amplifier
stops for any other reason, the pilot tone stops, the Pilot-
Tone fault indication shows on the front panel and a
signal is given on the Input fault relay.
If the power amplifier stops through overheat, then the
Overheat indicator shows on the front panel, the signal
is given on the Input fault relay.
The Pilot-Tone detection indicator can be set to ON or
OFF with the Pilot-Tone detection switch (17). The
Pilot-Tone indicator on the front panel is set to OFF, but
the fault relay switch still functions.
4.2 Battery
supervision
The power amplifier supervises the availability of the
back-up power supply.
If the battery supply fails the Battery fault indication
shows on the front panel and a signal is given on the
Battery fault relay.
The Battery Supervision indicator can be set to ON or
OFF with the Battery detection switch (15). The Battery
indicator on the front panel is set to OFF, but the fault
relay switch still functions.
4.3 Mains
supervision
The power amplifier supervises the availability of the
mains supply. If the mains supply fails and the back-up
power supply starts, a signal is needed to indicate the
mains failure. The Mains fault indication shows on the
front panel and a signal is given on the Mains fault
relay.
