Cerberus Pyrotronics Sxl Ex Manual Troubleshooting
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Over the past few days I have been wiring a Siemens SXL-EX panel. I was going through the wiring check-out procedures, and testing the Zones and NACs for correct resistance, but when I got to the NACs, a strange phenomenon occurred. Both read 5.15K, instead of the required 10K. When the resistor was removed, the NAC terminals would read 10K, and alone the resistor was 10K as well. As soon it was connected back to the system, the resistance reading returned to 5K.
For reference as to what is on the system, I have a Wheelock MT installed on NAC 1, and NAC 2 does not have a load, other than the resistor. Could someone explain what is going on, and is it safe to use the system like this, or will it malfunction? Was the panel powered up at the time and does the manual say it should be when you do these tests? Both NAC1 and NAC2 read the same reading but both have different loads? Did you try flipping the polarity of your meter?
Does the panel have any troubles when all the resistors and batteries are installed, with no devices connected? You are positive (har har) the resistors you are using are indeed 10K - Brown Black Orange Gold - right? Is your method of reading the resistance correct? You should say exactly how you are doing it. What kind of wire are you using? Here's why for each one: 1.
Whether the panel is powered or not would have an effect. If the manual says that it has to be powered on when you do these checks, make sure you do that. At first I thought you might have been reading the MT's resistance but you mentioned NAC 2 is doing the same thing. If there's anything wrong with the panel's internal circuits then game over. This does matter.
By your description it sounded a little like the ohm value of your resistors is too low. Just checking. This matters a lot, as too thin of a gauge can produce a lot of resistance on its own. NewAgeServer wrote:1. Was the panel powered up at the time and does the manual say it should be when you do these tests?
Both NAC1 and NAC2 read the same reading but both have different loads? Did you try flipping the polarity of your meter?
Does the panel have any troubles when all the resistors and batteries are installed, with no devices connected? You are positive (har har) the resistors you are using are indeed 10K - Brown Black Orange Gold - right? Is your method of reading the resistance correct? You should say exactly how you are doing it. What kind of wire are you using? Thanks for the quick response.
The panel was not powered, the manual does not explicitly state whether it should be powered or not, but the process involves connecting and removing wiring from the panel, so I assume it is supposed to be off. NAC 1 reads exactly 5.16K, NAC 2 reads exactly 5.15K. Switching the polarity did not change the reading, and it is mentioned in the manual that polarity does not matter. When I first powered it up when I got it, it showed no troubles and functioned correctly when I hit the drill button, silenced, and reset it. It also successfully entered programming mode. Yes, and they read 10K when tested individually. I measured resistance by placing the probes onto the tops of the screws on the terminal blocks, and holding them there for a few seconds.
The multimeter was set to measure resistance, and displayed the ohm symbol on the screen. I measured the zones in the same fashion and got the correct readings. I am using FPLP 14 AWG fire alarm cable (the kind with 2 conductors in the one shielding).
Siemens Sxl Ex
I have two Pyrotronics/Siemens SXL-EX boards with no display. The problem started when someone tried to use the 24 volt battery charging circuit. They used this same power on the alarm contacts on the board to energize a solenoid upon alarm. This may have worked in the past but I found the batteries were very old and maybe created a surge when the panel would go into alarm. When it went into alarm the board went out. Long story short: the panel shows no display, not even the AC led illuminates. The zones have no output voltage.
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However the charging circuit still works. The 2 fuses are good and did not blow. There are no burn marks or anything one the board.
This happened to two panels before I moved the solenoid circuit to a separate 24 Volt power source. Anyone know what component may be bad and preventing the displays from working? It seems the most likely culprit would be the L296 step-down regulator at the top-right hand corner of the board. This, and associated external circuitry, provide the low voltage power to the CPU chips, display, and IDC circuits (zones), all of which you say are inactive. The circuitry that uses the main 24V power feed from the transformer and LM317K regulator, NACs, battery charger, etc, are still active. With that in mind, I still think it's safe to say that the boards have sustained significant damage and most likely cannot be recovered.
The solenoid being connected to the batteries terminals would have forced high voltage and high current spikes through the board when it went into alarm. Both the inrush current and the EMF voltage spikes when the solenoid was powered down could have damaged any number of components in addition to the L296 regulator. Safety Systems wrote: I would think they would have engineered a few diodes on the board to prevent this problem. As I said earlier, a five hundred dollar circuit board sure protected a few thirty cent fuses. There are plenty of components to prevent damage to the board. The problem is that the connections that were made to these boards were so far out of line from the correct practices, that it was no longer protected. The designers can't anticipate everything, unfortunately.
Cerberus Pyrotronics Sxl Ex
Especially when considering the intended operators of these systems are trained professionals. If the connections are made properly, the boards can handle a few wiring mistakes. Once things start getting wired into where they should never be, all bets are off.