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February 25, 2024, 02:05:38 PM

Author Topic: Power Transformer Test Issue [resolved]  (Read 4977 times)

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Offline stuart.mclean

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Re: Power Transformer Test Issue [resolved]
« Reply #15 on: September 04, 2023, 07:47:05 AM »
Sure.  Here you go ...
Thanks

Offline Paul Birkeland

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Re: Power Transformer Test Issue [resolved]
« Reply #16 on: September 04, 2023, 02:22:47 PM »
The alligator clips you have on the power transformer terminals must not touch each other or the fuse will blow.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline stuart.mclean

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Re: Power Transformer Test Issue [resolved]
« Reply #17 on: September 04, 2023, 04:30:11 PM »
There was a small air gap, but to confirm I added a couple of wires to guarantee separation.  Unfortunately, same result (.034).  The DMM does show continuity across 7 an 8 so I assume the configuration is correct.
I'm using replacement fuses from Amazon (picture attached) if that may be an issue.

Offline Paul Birkeland

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Re: Power Transformer Test Issue [resolved]
« Reply #18 on: September 05, 2023, 06:00:19 AM »
Set your meter to read Ohms and (with no powder cord connected to the Kaiju and a fresh fuse installed), measure the DC resistance between the chassis and L on the IEC module, then the chassis and N on the IEC module, then let us know what those values are.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline stuart.mclean

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Re: Power Transformer Test Issue [resolved]
« Reply #19 on: September 05, 2023, 10:14:08 AM »
N = 0L
L = 0L
E = .9

Offline Paul Birkeland

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Re: Power Transformer Test Issue [resolved]
« Reply #20 on: September 05, 2023, 10:19:21 AM »
Does the fuse hold if you don't have your meter hooked up to the power transformer?
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline stuart.mclean

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Re: Power Transformer Test Issue [resolved]
« Reply #21 on: September 05, 2023, 10:49:04 AM »
No. I saw the flash in the IEC unit and checked - it was blown.
« Last Edit: September 05, 2023, 04:30:41 PM by stuart.mclean »

Offline Paul Birkeland

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Re: Power Transformer Test Issue [resolved]
« Reply #22 on: September 05, 2023, 07:06:09 PM »
I would pop all four wires off terminals 1-6 on the power transformer and just let them poke up into the air, then be sure a fuse holds under these conditions.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline stuart.mclean

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Re: Power Transformer Test Issue [resolved]
« Reply #23 on: September 06, 2023, 12:27:05 PM »
Disconnected the 4 wires.  Turned on power for about 30 seconds.  Fuse did not blow.

Offline Paul Birkeland

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Re: Power Transformer Test Issue [resolved]
« Reply #24 on: September 06, 2023, 01:55:33 PM »
Can you measure the DC resistance between power transformer terminals 1 and 3? Also 4 and 6?
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline stuart.mclean

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Re: Power Transformer Test Issue [resolved]
« Reply #25 on: September 06, 2023, 02:01:45 PM »
Resistance between 1 and 3 is 0.6.  Between 4 and 6 it is 4.5.

Offline Paul Birkeland

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Re: Power Transformer Test Issue [resolved]
« Reply #26 on: September 06, 2023, 03:01:19 PM »
You'll need to contact replacementparts(at)bottlehead(dot)com and let them know that you need a replacement PT-9.  Be sure to post a link to this thread which helps expedite the process.

-PB
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline stuart.mclean

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Re: Power Transformer Test Issue [resolved]
« Reply #27 on: September 06, 2023, 03:03:41 PM »
Thanks!  I'll get that in right away.


Offline stuart.mclean

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Re: Power Transformer Test Issue [resolved]
« Reply #28 on: October 01, 2023, 03:52:07 AM »
I received the replacement power transformer (PT-9) - Thanks! - and installed it with new wiring. The new transformer is working well, but I'm getting values that are very slightly outside tolerance:
PT Leads 7 & 8: 200 [manual states 190 +/- 5%]
            10 & 9: 6.84 [manual states 6.3 +/- 5%]
          14 & 11: 6.84 [manual states 6.3 +/- 5%]
Incoming voltage is 126 so I wired with the > 115 and < 130 instructions.
Does this call for any adjustment to the build?
Thanks for all your help so far!



Offline Paul Birkeland

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Re: Power Transformer Test Issue [resolved]
« Reply #29 on: October 01, 2023, 05:04:30 AM »
Incoming voltage is 126 so I wired with the > 115 and < 130 instructions.
Your powerline is about 5% high and causing the voltages to creep up a little bit, but those are OK.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man