HPF902ULADA Distributed Power Module Installation Manual
3-3
main panel to the HPF902ULADA. See Figure 4-2 for more details.
The main panel supervises its notification appliance circuits used for communicating with the HPF902ULADA
the same way it supervises ordinary notification appliance circuits. The signal inputs on the HPF902ULADA
monitor the polarity of the voltage coming from the main panel’s notification appliance circuits to determine
when to operate the notification appliance circuits on the HPF902ULADA. The HPF902ULADA emulates the
trouble behavior of a normal notification appliance circuit by interrupting the EOL supervision current for
internal or output trouble conditions on the HPF902ULADA.
Note that the HPF902ULADA will accurately sense the polarity of the main panel’s notification appliance
circuits to drive the outputs whether or not the supervision connection is intact. The following situations will
disconnect the EOL supervision at the signal inputs and indicate a trouble condition:
•
Low AC power
•
Low Battery condition
•
Earth ground fault to the system power or system ground
•
Auxiliary output power-limited condition
•
EOL supervision trouble or power-limited condition at an output
Trouble conditions will not necessarily occur for both inputs when the trouble is specific to a particular output.
Only the signal input controlling the output circuit that is in trouble will indicate a trouble condition. Below are
examples where both inputs do NOT indicate trouble for a trouble occurring at only one output circuit.
Note:
Once the inputs are driven with forward polarity to activate the outputs, the main control panel will not be able to sense
trouble conditions through its notification appliance circuit connected to the HPF902ULADA input circuits. Use the
HPF902ULADA trouble relay when it is necessary to monitor trouble conditions and active alarm conditions at the
same time.
Section 6 explains the significance of each trouble condition in more detail.
3.3
Notification Appliance Circuit Terminals
Terminals 3 through 10 are the notification appliance circuit output terminals. Each of the four circuits are rated
at 3 amps, although you can only draw a total of 9 amps from the HPF902ULADA. The HPF902ULADA
outputs are short-circuit protected (power limited) according to UL 864 standards. Overcurrent indicators are
yellow LEDs. The output voltage can vary depending on the load and input voltage.
The four power-limited NAC outputs can be configured as follows:
•
Four Class B circuits
•Faraday synchronized outputs
•
Two Class A circuits
•Gentex synchronized outputs
•
One Class A and two Class B circuits•System Sensor synchronized outputs
•
Class B, ANSI temporal-coded circuits•Wheelock synchronization outputs
• AMSECO synchronized outputs
One or both HPF902ULADA signal inputs control the NAC outputs, depending on the specific configuration
setup. Possible configurations for the HPF902ULADA are:
Example 1:
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.
Example 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.
For Option:
These Inputs:
Control These Outputs:
As:
1
Input 1
All outputs
Class B circuits
