Re: Help with Notifier AFP400 and 3 xp transponders

[Frank Olson <Use_the_email_links@xxxxxxxxxxxxxxxxxxxxxx>]

J Barnes wrote:
> Any Notifier experts here?  I need to know what the right 2 led's on the
> power supply are.  The pannel is an AFP 400 and the power supply is on an XP
> Transponder.  I think the LED's are + and - ground fault they are LEDs 4 and
> 5.  I have an intermitant trouble on this transponder that shows short
> circuit.  What would the system be monitoring for a short circuit?  I have
> tested all the horn loops out of the transponder and cannot find a short
> "positive to negative".

There are two different power supplies you can use for this transponder.
    The MPS-24A and the MPS-24B.  On the 24A (probably the one you
have), the two LED's on the far right are ground fault indicators.  From
what you describe, the power supply is faulty.

And by the way, the LED configuration should be indicated on the battery
dress panel (the dead front cover that fits over this section of the
cabinet).  If it's not there, the UL Listing for the panel may be
compromised as well as the safety of anyone operating the panel.


>
> Also it shows an invalid reply on a different transponder,  when I reset the
> panel the transponder will work for about 5 minutes then it goes back to
> trouble with an invalid reply.  During the panel reset the LED's on the
> transponder lite up so I am fairly sure the thing is talking with the panel.
> What would cause an invalid reply?  On the addressable loop that goes to
> this transponder I have noticed the shield is not grounded.  When I tried to
> ground the shield, every device on the loop gave me an invalid reply
> trouble.  I measured the shield to the other loop wires but dont show any
> kind of short.  Any Ideas?

Typically you only connect the shield at the common control and not at
the transponders.  If this is the only unit in the system that is
transmitting an invalid reply, then I would suggest the XPP (Transponder
Processor Module) may be faulty.  Check your wiring first though.
Voltage across the SLC loop should be the same as the other units on line.