Re: Help with Notifier AFP400 and 3 xp transponders

Frank,

Thank you for the reply, the information you gave was helpful. The power
supply problem is fixed :)

This problem with the invalid reply is strange. Today I installed a new
XPP1 module but the problem is still there. This sugests to me it is a
wiring problem however I have the same voltage on the loop as the working
transponder. The other thing is the working transponder is only about 20
feet from the non working one. They are both programmed on the 2nd
addressable loop. The only thing im not sure of is where the wire goes
before it gets to the other transponder. I think ill try running a
temporary wire from the non working unit to the working unit and see where
that gets me.

The shields on both addressable loops are not grounded at any device,
including the main control. When I grounded #2 at the main control all the
devices on that loop gave me an invalid reply. When I grounded the shield
for loop #1 only one of the devices on that loop gave me an invalid reply.
I think their may be a wire problem on these loops, but I cant find it with
a meter. I tested for shorts from the shield to + and - on the loop but
none show up. Do you have any other ideas to find this problem? Or am I
faced with pulling every device on the loop to make sure the shield is
spliced together and not shorting to any equipment.

James


"Frank Olson" <Use_the_email_links@xxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:OIzCg.369094$IK3.182198@xxxxxxxxxxx
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.


.

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