Voltage on class A Edwards signaling line ckt

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thekernel

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Hi,
I'm troubleshooting an issue between a Siemens panel that is monitored by an EST3 panel. We are using a SIGA-CR and SIGA-CT2 module.
The SIGA-CT2 module's red led intermittently glows red with varying intensity.
The input 47kohms seems good/ stable.
My question is, the Data in/out jumps around between 11-20 VDC. Should it do this? I don't know what sort of voltages to expect on the data line. The EST3 panel is supplying this voltage, obviously, and even with the loop card for the data line removed, the "hopping" voltage is what I read on the pins. Broke my head browsing GE's site, can't find the right info there.
Appreciate any help!
 
I've done soo much est-3 this year I'm sick of fire alarm. It is a great system though, blows simplex away IMO. On the data loop you should read between 10-20vdc, I have a greenlee multimeter and it hangs at around 16-19 most of the time. If it goes between 0-5vdc there's a short on the loop. As for the red light, what is the CT monitoring, is it normally open?, the CT wants to read the resistor during normal operation and read a short during an alarm or trouble. try putting the resistor across 5/6 and the other 7/8 see if the CT is good first, check for continuity on the the load being in monitored if it rings through thats the problem.
 
LLSolutions said:
I've done soo much est-3 this year I'm sick of fire alarm. It is a great system though, blows simplex away IMO. On the data loop you should read between 10-20vdc, I have a greenlee multimeter and it hangs at around 16-19 most of the time. If it goes between 0-5vdc there's a short on the loop. As for the red light, what is the CT monitoring, is it normally open?, the CT wants to read the resistor during normal operation and read a short during an alarm or trouble. try putting the resistor across 5/6 and the other 7/8 see if the CT is good first, check for continuity on the the load being in monitored if it rings through thats the problem.
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I agree ,but is the interface to the siemens panel a dry close contact.or is their trans voltage across the siga cr. The siga -cr can handle 24dc @5amp and 110 @.5amp What is the trouble report exactly from the Est 3 ? Device comm fail?
 
Right on, thanks for the info LL.
Kevink - the inputs to the SIGA-CR2 are dry contacts with a 47k resistor across them (trouble and alarm outputs of Siemens panel). I was getting a steady 7.4 volts DC. Just found out that I can get a diagnostics report from the CR2 module, I'm going to do that today, plus throw a meter on that input for awhile.

I may have a real trouble coming into the Siemens panel (therefore causing the trouble output of panel that feeds Input to the SIGA-CR to close, Michael), but I sure don't like how I get a varying intensity of red on the LED on the CR2, and only occasionally will it be intense enough ("closed" enough? Should be off or on!) to cause alarm at the EST3.
Thanks again for the help, guys.
 
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