[Message Prev][Message Next][Thread Prev][Thread Next][Message Index][Thread Index]

Re: Alarm system transformer + power supply (would both go bad at once?)



Dud,  it looks to me like you got a bad module..
the Cap  is bad just to look at, and since  you need the relay to close to
pass the voltage to the terminals, anything in that hold-in circuit thatâ??s
bad will disable that..
discard the module,  if you still need a low voltage disconnect feature,
try
http://www.elkproducts.com/product-catalog/elk-965-low-battery-cutoff-and-master-power-switch
the Elk 965 will disconnect the power when voltage drops below its threshold
..

rts

"Danny D'Amico"  wrote in message news:l6r5lv$4a2$1@xxxxxxxxxxxxxxxxxxxx

On Sat, 23 Nov 2013 11:39:11 -0600, Nightcrawler® wrote:

>>I don't see a fuse on the Radionics D2212 BLT circuit board:
>> http://farm3.staticflickr.com/2866/11014946826_4ecdea2144_o.gif
>>
>>And, I don't (yet) see a fuse in the Radionics D2212B LT diagram:
>> http://farm3.staticflickr.com/2861/11014840755_8169e24a57_o.gif
>>
>>And, I don't see an inline fuse in the "rats nest" below the board:
>> http://farm8.staticflickr.com/7409/11014945176_770ebeea29_o.gif
>
>> I'm not sure what to make of these measurements:
>>1. Battery hooked to power supply is 12.87VDC:
>>   http://farm4.staticflickr.com/3675/11012106735_6462c93b69_o.gif
>>2. Yet, battery hooked to PWR and GND blades of power supply = 0VDC:
>>  http://farm4.staticflickr.com/3671/11012333553_83db5107c8_o.gif
>>3. Battery hooked to just GND blade on the power supply = 12.87VDC:
>>   http://farm8.staticflickr.com/7360/11012206866_fdcb4a46a6_o.gif
>>4. Battery hooked to just PWR blade of power supply = OVDC:
>>  http://farm6.staticflickr.com/5516/11012206746_15cf8b97f4_o.gif
>
> What are the voltage measurements of the pins by the
> capacitor?

Are you asking me to check the DC voltage across the capacitor
of the D135A low-battery disconnect circuit?
http://farm6.staticflickr.com/5504/11013315874_62a158a0de_o.gif

Specifically these two points, where I had previously measured the
resistance (with no power to the circuit) across that same cap?
http://farm6.staticflickr.com/5484/11013352723_e91013b313_o.gif

> What connects to J1 and J2 (GND and PWR post, respectively)?
J1 on the D135A board goes to gnd on the Radionics D2212B board.
J2 on the D135A board goes to pwr on the Radionics D2212B board.

> That black object between J1 and J2 is a relay.  This relay needs
> to be activated by something, and I am guessing a power failure
> deactivates this relay, enabling the battery back-up.

I do not know the answer. Here's a closeup of that relay:
  http://farm3.staticflickr.com/2894/11013237706_28045e3abe_o.gif

All I know, for sure, that's bad is that the ELK-TRG1640 transformer
has a blown secondary (open circuit) but I don't know what blew it:
http://farm6.staticflickr.com/5527/10989885984_72d64103f6_o.gif

> So, are J1 and J2 inputs with the connector being the output, or
> vice versa?

I think the D135A low-battery disconnect is supposed to be taped
to the battery, which turns off the circuit at 9.5V but otherwise
does nothing else; so that's why I think it's weird that I get
0 volts across J1 and J2 when the battery is hooked up.

To see if it was the battery, I charged the battery on a car
charger (6 amp limited) and I was surprised to see the battery
only took about 30 ma (I had to measure it since it was too low
for the car charger gauge to show any movement).

After five minutes, I took it off, and the battery measured at
13.5 volts (some of which might be surface charge):

Then, I hooked that battery to the D135A and measured across
J1 and J2 again (which seems to be the 12VDC input to the
alarm circuit board).

1. The voltage across the battery inputs was 13.31VDC:
   http://farm4.staticflickr.com/3780/11016175513_af16f7c34e_o.gif

2. The voltage across the PWR and GND (J2 & J1) spaces was 0V:
   http://farm4.staticflickr.com/3786/11016128584_20e6cba24f_o.gif

3. The voltage across the battery & the GND (J1) was 13.31 VDC:
   http://farm4.staticflickr.com/3772/11016174693_48beeeeed8_o.gif

4. But the voltage across the battery & the PWR (J2) was 0 VDC:
   http://farm6.staticflickr.com/5511/11015955585_26a8e37a41_o.gif

I don't understand that.

5. The voltage across the electrolytic capacitor was 0V:
   http://farm6.staticflickr.com/5508/11016126814_909b0dc00d_o.gif

6. And, the capacitor leads appear to have heated up at one point:
   http://farm4.staticflickr.com/3795/11016173493_914e59eb22_o.gif

So, could it be that the 16.VAC transformer opened up a secondary
when the battery protection circuit opened up a capacitor?

Seems unlikely, doesn't it? Especially just from turning off the
main breaker with the generator kicking in the day before?



---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com



alt.security.alarms Main Index | alt.security.alarms Thread Index | alt.security.alarms Home | Archives Home