Power Requirements
TheB1290willoperatefromasupplyof+11.5VDCto+28VDC. Thetypical
current requirement is 100 mA plus 10 mA per relay. Each expander uses
an additional 60 mA plus 25 mA per relay.
Connect power only to one of the two available inputs: the DC inputs on
the Radio terminal block or the plug used with an AC adapter.
Installation
The B1290 should be installed in a clean, dry place suitable for electronic equip
-
ment. The unit will operate from -40
o
Cto+60
o
C.
Caution: Powerand the telephone line should not be connected until the restof the
installation is complete.
Use aflat blade screwdriver tomake connectionsto the screw terminalson
the sides of the enclosure.
Alarms
In its default condition, the B1290 looks for a normally open (NO) contact
which closes to ground to indicate an alarm. The B1290 may also be pro-
grammed to accept inputs normally closed (NC) to ground which open on
an alarm condition. To change this parameter, refer to the alarm format in
I/OConfiguration- Program Code5. Whenusing NC contacts,ensurethat
all unused alarm points are either disabled or connected to ground. Refer
to Figure 4 for details on how to connect an alarm signal line.
All of the alarm inputs are optically isolated and are operated from the
B1290’s internal 12 volt supply.
Connect the alarm inputs to the positions labeled 1 through 8 on the
ALARM terminal block.
Caution: DO NOT connect a voltage source to the alarm inputs.
14 Getting Started
Figure 4 Alarm Input Connection
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