Eagle Eye BTM1000 User manual - page 4
BTM-Series User Manual
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The system monitor must be supplied with a DC 12 volt, 1 Amp supply, connected as
indicated below.
Number of sensors allowed on a system:
Although a large number of sensors may be
used in a single circuit (over 100), the number of alarm LEDs which can illuminate in alarm
conditions is dictated by the amount of voltage available. The maximum number of sensors
which can display an illuminated LED in alarm conditions is 15.
Note:
If a system has more than 15 over-temperature warnings active then the brightness of
the sensor LEDs will reduce. More over-temperatures will result in further reduction in
brightness. However the LE
D’s on the monitor box and the relay outputs
will continue to
operate normally.
Fail-safe operation:
The system is configured fo
r ‘fail-safe’ operation; this is required by
many ultra- sensitive installations, particularly oil & gas installations, utilities, nuclear power
generating stations etc. In fail-safe operation, the alarm relay outputs are held on at all
times, except when in alarm condition. This means that if the power to the unit should fail,
the unit will always alarm, due to the output relays
‘dropping out’ and changing over.
In fail-safe operation, the relays are held
‘on’ continuously, until an alarm event occurs,
when they will go to the
‘off’ condition, i.e. open.
System operation
Quick Notes:
1.
The sensors may be connected either way round, they are not polarity conscious.
2.
The relays are
‘fail-safe’, i.e., they are continuously energised, and de-energise at a fault
condition, including loss of unit power.
3.
The microprocessor inside the unit updates change in conditions every four to five seconds.
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