15073 OWNER’S MANUAL
447179 Issue 1 Rev. A
1
1.
1. DESCRIPTIONS
DESCRIPTIONS
The 15073 is a notification and auxiliary power expander that provides up to 6 amps of 24 volts for
powering notification appliances and auxiliary devices. The 15073 provides its own AC power
connection, battery charging circuit, and battery connections. Used with a fire alarm control unit, this
enables you to connect and distribute power to many more devices than your control unit may normally
allow.
1.1 GENERAL DESIGN FEATURES
Inputs
The 15073 has two optically isolated inputs that provide the connection from the fire alarm control unit
notification appliance circuit to the 15073. The inputs also provide a connection for returning a trouble
condition to the control unit NAC.
The fire alarm control unit supervises its notification appliance circuit used for communicating with the
15073 the same way it supervises ordinary notification appliance circuits. The inputs on the 15073
monitor the polarity of the voltage coming from the fire alarm control unit’s notification appliance circuits to
determine when to operate the notification appliance circuit outputs. The 15073 emulates the trouble
behavior of a notification appliance circuit by opening the EOL supervision current for trouble conditions.
Note that the 15073 will sense the polarity of the fire alarm control unit’s notification appliance circuits to
drive the outputs whether or not the supervision connection is intact.
The following situations will open the EOL supervision at the inputs indicating a trouble condition:
No or Low AC power.
No and Low battery condition.
Ground fault to the output wiring.
Auxiliary Power Supply output over-current condition.
NAC output open, shorted and over-current condition on outputs associated with its input.
Notes:
If input 1 controls all four outputs, a fault on any output will cause input 1 to indicate trouble. The fault
does not affect input 2.
If input 1 controls outputs 1 and 2, and input 2 controls outputs 3 and 4, a fault condition on output 3 or 4
will cause input 2 to indicate trouble. The fault does not affect input 1.
Once the inputs are driven with forward polarity to activate the outputs, the fire alarm control unit will not
be able to sense trouble conditions through its notification appliance circuit connected to the 15073 input
circuits. Use the 15073 trouble relay when it is necessary to monitor trouble conditions and active alarm
conditions at the same time.
Notification Appliance Circuit Outputs
The 15073 has four dedicated, power-limited, NAC outputs that can be configured as two Style Z (Class
A) or four Style Y (Class B) circuits.
The 15073 provides three configuration options that will drive outputs as slaves that will follow the input or
if the inputs are on constant as ANSI temporal code or Sync strobe/horn operation.
Each of the four outputs is rated at 3 amps, though you can only draw a total of 6 amps from the 15073
outputs. The yellow
Output
LEDs (DS1-DS4) will indicate an open, shorted or over-current condition on
its associated NAC Output.
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