Simplex 4004 Fire Panel

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mikesta
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Wed Apr 22, 2015 7:46 pm

ok, I tried to read and read again and remember I'm foreign to this stuff. I think I did as you said and yes I get a F code on the Nac 2. I think it needs a Diode.

Is this right?
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Wed Apr 22, 2015 8:51 pm

NAC 2 needs a 10,000 ohm resistor connected to clear the F code trouble, not a diode.

And a wire nut on that wire joint.

The wire from the relay coil should not be connected to ZONE 1 AUX. It should move left to terminal 9. Connected as it is now the doors would only close on an alarm in ZONE 1. If ZONE 2 goes into alarm the doors would not close. The doors should close on general alarm.
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A diode is needed across that relay coil to prevent it from spiking the panel. That could cause unwanted restarts or worse permanent damage. Below is an oscilloscope photo of an unsuppressed 24 volt DC relay turning off. Notice it produced a -240 volt spike.
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Mohammed
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Wed Sep 26, 2018 7:35 am

simplex 4004R Panel Power LED is OFF but System LED is ON
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Wed Sep 26, 2018 9:41 am

I take it that the "System" LED is the "System TBL" LED. This information is from the manual.

AC Power LED
Green LED. When lit steady, it indicates that the panel is
receiving AC power that is within the specified range. If
this LED is not lit and the panel is still functioning, this
indicates that the panel is using battery power to operate.
Make sure to notify the building’s facility management
immediately if this occurs.

System Trouble LED
Flashes until acknowledged when any trouble occurs in
the panel. Changes from flashing to on steady to indicate
an acknowledged trouble.

Either the system has lost AC power or has an internal failure which most likely requires a board replacement and reprogram. An authorized technician should be called in to troubleshoot the system.
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