4 Channel NAC Panel Module

Open Circuit. End-of-Line Diodes are installed backwards, causing a trouble event: "NAC Output # has a full open circuit trouble".

Install the End-of-Line Diode in the proper orientation.
INCORRECT ORIENTATION

CORRECT ORIENTATION

Open Circuit. A break in the wiring pathway exists and causes a trouble event: "NAC Output # has a full open circuit trouble".

Investigate the wiring problem and correct any interruptions in the circuit. When the wiring issue is resolved, the trouble on the panel will restore.

Trouble NAC Output # has a Voltage Limit Trouble. Voltage on the circuit is dropping excessively. When NACs are activated, they will shut down within milliseconds of activation. This process will repeat 3 times and then NACs will shut down completely and the panel will display a Voltage Limit Trouble. This is typically caused by an excessively overloaded circuit.

Recalculate the load on the system and remove the number of devices necessary to ensure the circuit's current limit is not exceeded. To test the current limit, activate the NAC circuits and verify proper operation. If panel posts a Current Limit Trouble, refer to NAC Current Limit Trouble below.

Short Circuit. A connection exists between a positive and negative conductor on the wiring pathway.

Investigate the wiring, looking for an obvious cause of a short circuit. If not obvious cause exists, perform the following procedure.

Disconnect the field wiring from the panel (both ends of a Class A circuit). The trouble should change to an Open Circuit Trouble.
Break the connection at the halfway point of the wiring pathway.
Using an ohm meter, determine which half of the path contains the short.
Repeat steps 2 and 3 until the short is located.
Repair the cause of the short, reconnect all of the breaks, and reconnect the field wiring to the panel.

Wiring Trouble. If a wiring trouble occurs when NACs are activated, the likely cause is an excessive wire resistance condition that exists on an active Class A circuit, resulting in reduced voltage at the IN terminals of the panel. This results in a trouble being reported and the panel powering both the IN and OUT terminals. This type of trouble will clear when Reset System is pressed on the panel.

If the wiring path is excessively long, a lower gauge wire may need to be used. Use the calculator in to verify that the appropriate wire was used during installation. If the appropriate wire was used, there may a high resistance connection somewhere on the circuit.

To locate the cause, disconnect the field wiring from the IN terminals.
Activate the circuit.
Determine whether the last device on the circuit is still operational. If not, locate the last operational device along the path. The voltage drop is likely between the operational and non-operational device. Move to step 6.
If all devices are operational, measure the voltage at the OUT terminal and the IN terminal for comparison.
Starting from the OUT terminal, measure the circuit voltage at various locations until a significant voltage drop is located.
Repair the loose connection between these two devices. If no loose connections are found, temporarily run new wire between the two devices and determine if this corrects the trouble. If this corrects the issue, permanently replace the wire between the two devices.

Wiring Trouble. If pressing Reset System does not clear the trouble, the likely cause is that the panel has detected Class A wiring on a circuit programmed Class B OR Class B wiring on a circuit programmed Class A.

Correct the programming so that it matches the wiring configuration.

Trouble NAC Output # has a Current Limit Trouble. Devices on the circuit are exceeding the current limit. When NACs are activated, they will shut down within milliseconds of activation. This process will repeat 3 times and then NACs will shut down completely and the panel will display a Current Limit Trouble.

Verify the programmed current limit. If the limit is set correctly, verify that the installed devices do not exceed the programmed current limit. Then, check for defective devices on the circuit.

8 Channel Conventional Zone Panel Module

Open Circuit. A break in the wiring pathway exists and causes a trouble event: "Channel # has a full open circuit trouble".

Investigate the wiring problem and correct any interruptions in the circuit. When the wiring issue is resolved, the trouble on the panel will restore.

If all devices are in normal standby, and a Short Circuit trouble is indicated on the panel, a connection exists between a positive and negative conductor on the wiring pathway.

Investigate the wiring, looking for an obvious cause of a short circuit. If no obvious cause exists, perform the following procedure.

Disconnect the field wiring from the panel (both ends of a Class A circuit). The trouble should change to an Open Circuit Trouble.
Break the connection at the halfway point of the wiring pathway.
Using an ohm meter, determine which half of the path contains the short.
Repeat steps 2 and 3 until the short is located.
Repair the cause of the short, reconnect all of the breaks, and reconnect the field wiring to the panel.

After device activation, a Short Circuit is reported on the panel.

If activations are not intended to be short circuits, add (or correct the wiring of) trigger resistor. If activations are intended to be short circuits, change Short Circuit Activation field in panel programming to "Yes".

After device activation, no indication occurs on the panel, and LED5 on the module does not flash as a result of the activation.

Restore the activation and measure the circuit voltage as directed below.

If voltage at panel is < 15 V, verify that the board is fully seated in slot. If the board is properly installed, contact Technical Support.
If the voltage at the panel is > 15V, measure the voltage at the device.If voltage at device is < 15 V, troubleshoot the field wiring.If voltage at device is > 15 V, using an ohm meter, verify the value of the trigger resistor is 470 ohms +/- 20%.
If voltage at device is > 15 V, using an ohm meter, verify the value of the trigger resistor is 470 ohms +/- 20%.

After device activation, no indication occurs on the panel, and LED5 on the module does flash as a result of the activation.

Check panel programming. Ensure that the appropriate Input Action is selected. Selecting "Transparent" will result in no indication on the panel unless the input is part of a cause and effect relationship.