Recent Posts

Pages: 1 ... 4 5 [6] 7 8 ... 10
51
Lister Based Generators / Re: Help Needed on a lister brush set (wiring diag E1184855)
« Last post by Ernie on March 20, 2024, 03:41:47 PM »

Hi Bob,

check that the governor mechanism is working correctly and leave it at that. I have to use goole for the governor mechanism  :)
I used google, i am going to check if the rpm is correct (1500)
I hope it is correct, now 380V and 50,5Hz with no balast.

Yesterdag i dit some work at the fixed resistors, left yesterday, 2 right more than 15 years ago and it still fit.
52
Lister Based Generators / Re: Help Needed on a lister brush set (wiring diag E1184855)
« Last post by Ernie on March 20, 2024, 11:06:07 AM »
Hi Bob, thanks for the reply (in line answers)

Good day Ernie, a very interesting question you have posted. You want to fit an AVR to a generator that outputs both 380 volt 3 phase at 50 Hz and also 220 volts at 50Hz. Your generator stator is wired in a Y configuration with the three phase coming off the three legs of the Y but you also have a fourth slip ring on the stator that comes off the centre of the Y, your 220 volts will be between that centre tap and one of the outer legs of the Y. I have never seen an AVR that could control both three phase output and single phase output, I am not saying that such a unit does not exist but if it does it might be very expensive.

Looks like i got from the power company 3 fase Nutral and earth. If an AVR can control the 380V part the 220V part is always good (1:1 relation 380:1.73=219.6)

I am curious to know why you want to fit an AVR, do you run a lot of very sensitive electronic devices? I ran a ST2 Generator with a single phase 7 KVA Brush generator for many years in Northern New South Wales, Australia, under no load it was dialed in to produce 240 volts at 50 HZ, at full load it would produce 235 volts at 49.7 HZ, not bad for a fifty year old generator set. I ran computers, TVs and all household electrical appliances off this unit without any problems

No i dont need a AVR ( i thougt it was the only way to go from 380V to 400V)

Personally, I would replace the old selenium rectifiers with modern silicon rectifiers. Ok

and then adjust the wire rheostats to get as close to your desired voltages as possible. Is the rheostats the only resister i can adjust, above post second picture? (Pentagon 2R0)

check that the governor mechanism is working correctly and leave it at that. I have to use goole for the governor mechanism  :)

Are the 3 fixed resistors (Pentagon 2R0) to be replaced by 2R0 100 Watt resistors? (Pentagon 2R0 is on the resistor, 2R9 in real)

regards, Ernie
53
General Discussion / Re: Lister RS1 Magneto short circuit to casing
« Last post by cobbadog on March 20, 2024, 10:10:34 AM »
Well done to you for resolving the problem. Im not sure what it is you did so if you have a pic or two that may help my small mind put it together.
54
Generators / Re: Help with Mindong single phase synchronous generator
« Last post by keith71 on March 20, 2024, 10:07:21 AM »
With all the reading I have done here, BruceM would be the guy to ask info and possibly a manual on these gen heads. Hopefully he will see your post.
55
Generators / Re: Help with Mindong single phase synchronous generator
« Last post by vdubnut62 on March 20, 2024, 03:47:57 AM »
Thanks guys, I should have been clearer, genhead is what I know nothing about. I have 3  1100 engines and 1 1115.
The generator does look like an ST head ( I have 3 of those), but the similarity ends when I take the rear cover off. It is totally different.
Ron.
56
General Discussion / Re: Lister RS1 Magneto short circuit to casing
« Last post by cobbadog on March 19, 2024, 10:23:36 AM »
Well done to you for resolving the problem. Im not sure what it is you did so if you have a pic or two that may help my small mind put it together.
57
Lister Based Generators / Re: Help Needed on a lister brush set (wiring diag E1184855)
« Last post by ajaffa1 on March 19, 2024, 06:19:57 AM »
Good day Ernie, a very interesting question you have posted. You want to fit an AVR to a generator that outputs both 380 volt 3 phase at 50 Hz and also 220 volts at 50Hz. Your generator stator is wired in a Y configuration with the three phase coming off the three legs of the Y but you also have a fourth slip ring on the stator that comes off the centre of the Y, your 220 volts will be between that centre tap and one of the outer legs of the Y. I have never seen an AVR that could control both three phase output and single phase output, I am not saying that such a unit does not exist but if it does it might be very expensive.
I am curious to know why you want to fit an AVR, do you run a lot of very sensitive electronic devices? I ran a ST2 Generator with a single phase 7 KVA Brush generator for many years in Northern New South Wales, Australia, under no load it was dialed in to produce 240 volts at 50 HZ, at full load it would produce 235 volts at 49.7 HZ, not bad for a fifty year old generator set. I ran computers, TVs and all household electrical appliances off this unit without any problems.
Personally, I would replace the old selenium rectifiers with modern silicon rectifiers and then adjust the wire rheostats to get as close to your desired voltages as possible, check that the governor mechanism is working correctly and leave it at that. If you have sensitive electrical appliances, feed them off a UPS which will stabilise the voltage supply to those items.

Hope this helps,

Bob
58
Lister Based Generators / Re: Help Needed on a lister brush set (wiring diag E1184855)
« Last post by Ernie on March 17, 2024, 06:17:13 PM »
some more pictures
59
General Discussion / Re: Lister RS1 Magneto short circuit to casing
« Last post by Big G on March 17, 2024, 02:22:45 PM »
The problem is now resolved! As suggested, I managed to completely dismantle the bakelite block and it's various components. It's not that straightforward as the end of the fixing that protrudes on the outside of the front, is piened outward to hold the felt washer in place. The other end of this is a hex head, held in place with a tab washer. I had to remove all of the felt washer and any of the remaining bent over bits. I also had to cut a slot in the hex head to get more purchase. The part is smooth on the outside and threaded internally to take the screw at the front. The hole in the casing has an insulating tube, which together with the felt washer stops any short circuit from the brass tab through the body....... well in theory anyway! I had to remove the remnants of the end that had held the felt washer and in doing so, lost most of the protrusion beyond the front of the casing. I also had to straighten the end and re-tap the internal thread. With all the parts out, it was easy to re-solder the fixing post for the points to the brass plate. I used a sticky felt pad (used for furniture legs) with a hole punched in it and an insulating washer, brass washer and spring washer, so I could tighten the whole thing and still keep it insulated from the body. I re-tested for short circuits and all now ok. The cherry on the cake was putting the whole mag back together with the original coil and getting a spark from casing to coil via a bit of brass wire when I spun the rotor.
60
Lister Based Generators / E9840256 wiring diagram
« Last post by MzunguSteve on March 16, 2024, 05:43:48 PM »
Hello
Does anyone have clean copy of the connection diagram or the manual E9840256 for the Brush SCTF225 7KVA generator please.
The website which used to contain this manual is no longer accessible.
Thank you
Pages: 1 ... 4 5 [6] 7 8 ... 10