Question about Simplex 4009-9001 Nac Power Extender Panel

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What, besides battery failure , causes 4009-9201 panel battery trouble alert on 4010.

We get battery trouble alert on 4010 main panel, but 4009-9201 shows no trouble via LED's. Trouble is only cleared by disconnecting battery and AC power and 4010 will reset. the battery circuit is reading 24.9 volts with the batteries connected or between the red or black lead and the batteries. It reads nothing between the battery charger leads without the batteries in the circuit. Do you know where the trouble might be or how to verify the problem is in the 4009-9201 panel?

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My problem turned out to be with the board and the output of the charger was too low. It needs to be about 27.5 volts. The transformer was okay but the circuit that controlled the output was bad and even with adjusting the potentiometer we could not get the charger to put out the correct voltage. The fix was a new board from Simplex. We got a deal as the tech that came out had the board on his van . Labor and parts were $1,100.00. We get a lot of spikes where we are in Arizona and suspect that a bit of a jolt from a spike or nearby lightning strike wounded the board. A surge protector can help but a hard hit will toast this board.The trouble sensor looks for a full output charge or it will show a trouble
Hope that helps

Posted on May 12, 2014

  • Fred Blundell
    Fred Blundell Jan 10, 2015

    I just read your comment. You were right about the output voltage and the output on the printed circuit board failing. We were blessed and were able to purchase a new complete panel through Amazon at less than $250 and had an independent local fire alarm company install it for us to comply with local fire alarm code. The installation charge was $$ 85/ hour or $170 or less for a 2 hour minimum. I plan to install Delta brand surge protectors online for each of our church buildings. My wholesale electrical supplier highly recommends them because they put some in their office and warehouse and their computer and fluorescent light and ballast failures were cut to almost nothing.

  • Fred Blundell
    Fred Blundell Jan 10, 2015

    We were able to verify it was the charging circuit after consulting with Simplex and other alarm servicemen. The circuit board checks itself every 24 hours for adequate battery voltage and goes into trouble mode until it is reset. It goes into trouble mode again in 24 hours unless the batteries have been replaced or charged by another means.


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Another possible problem is that the battery amp hours are too low. To test this you will need a battery tester, a meter will not simulate load tests, etc..

Posted on Feb 25, 2016


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