Called back to site this morning and the alarm is working fine, replaced the cable and expander, seems the fault was with the cable between the panel and expander, the damaged cable was an 8 core doubled up to make a 4 core as the cable run was a fair distance, there was only one strand of cable damaged hence why it wasn't popping any fuses or causing any fault codes to be thrown up, hopefully this should resolve the issue,

30 mts was mentioned,

The fault is still there.

What was the current draw before and after?

Edited October 29, 201213 yr by Oxo

30 mts was mentioned,

The fault is still there.

What was the current draw before and after?

You`ll get a headache doing that

30 mts isnt long. One core damaged, not shorting, just damaged.

Cannot see that drawing enough current to drag down a tranny.

Considering the distance.

You`ll get a headache doing that

30 mts isnt long. One core damaged, not shorting, just damaged.

Cannot see that drawing enough current to drag down a tranny.

Considering the distance.

Oxo - Agree, even if it was shorting to earth.... MS Security - are you sure it was not shorting to another core?

Strange how its popping the transformer

I had a fault that had another co changing pcb's for no reason other than it blowing the aux fuse every few weeks and appearing dead to the customer.

Granted it was on a 9448, previous co had replaced fuses, panel pcb's, then it pops again customer had enough, so tried us

I turn up replace fuse..... check draw in 'day'..... fine, so check draw though each fuse (only battery and AUX- no separate bell) again fine.... full alarm, pulling near 2A when the bell activated. Replaced the unit, tried again, down to 630ma. So the fault was actually a detector FA, triggered the bell, pop, panel 'dead' when they arrive home

Basics go a long way

Like I said one core down out of a pair over 30 mts will not draw that much to pull down a tranny. Not unless the panel is not up too it.

New PCB new tranny. There is something else.

Note no Ma taken or given again.

Just wanted say thanks for all the useful comments (some not so useful, seems like some guys like to blow there own horns on here!)

Called back out to site today and installed a new transformer and checked the log it came back with a false alarm from a detector connected to an expander then a mains fail, I have3 expanders installed- 2 next to the panel and one 30 metres away', the false alarm came from the detector connected to the expander furthest away so I tested tested the cable to the expander and the faulty detector and found a short on the expander cable, (builders had damaged the cable) I did not have time to replace the cable so I disconnected the expander and expander cable, I'm hoping this will resolve the problem, I will be calling back tomorrow to replace the cable and expander,

The weird thing is the alarm never threw up any faults from the attached expander!

So it goes into alarm then pops the tranny fuse? Overloading in alarm condition is my two penneth

No it was killing the Transformer, not the fuses.

but was it? hence the 'mains fail' in the log

I presume they are fused down (I can only think of some old Scannies that weren't) If its fused the excessive current draw *should* blow the incoming fuse rather than the transformer .......

Edited October 30, 201213 yr by 9651