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  #31  
Old Mon 18 January 2010, 05:11
iclazion
Just call me: Leonard
 
Pretoria
South Africa
Just phoned Communica in Pta and this is the link they sent me. Would this work or should I rather import the torroid and Rectifier. http://www.communica.co.za/ProductDe...P_001950335440
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  #32  
Old Mon 18 January 2010, 05:31
Kobus_Joubert
Just call me: Kobus #6
 
Dalview
South Africa
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Contact Greg in Edenvale...he has the right stuff available. CNCdirect
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  #33  
Old Mon 18 January 2010, 06:08
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Leonard, your transformer must match your motors and drives - have you selected motors and drives yet?
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  #34  
Old Mon 18 January 2010, 06:24
iclazion
Just call me: Leonard
 
Pretoria
South Africa
Here are the spesifications on the motors and drivers.

Nema 34 Stepper Motor model : 85BYGH450-007
Rated Voltage : 6.4 V
Rated Current : 2 A

Motor Drivers : SD-2H086MB
Output Current : min 1.29A - Max 5.86A
Supply Voltage (DC) : min20VDC-typical 68VDC – max 80VDC
Pulse input frequency : min 0 KHz – max 200 KHz
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  #35  
Old Mon 18 January 2010, 06:47
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Have you got data sheets for the motor and drive? (those numbers don't ring any bells)
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  #36  
Old Mon 18 January 2010, 07:18
iclazion
Just call me: Leonard
 
Pretoria
South Africa
85BYGH450D 007 (873 oz-in Holding Torque)
http://www.wantmotor.com/ProductsVie...&pid=75&sid=80

Step Motor Drivers - SD-2H086MB
http://www.wantmotor.com/ProductsVie...&pid=75&sid=82

I hope this information helps. The reason I did not order the 1317oz-in stepper motors was because there was a topic on mechmate about rather getting a 800oz-in or 1000oz-in servo motor if one wanted to go bigger than 1000 oz-in?
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  #37  
Old Mon 22 March 2010, 22:48
timberlinemd
Just call me: Steve #66
 
Arizona
United States of America
Wiring the primaries in series at 230v

If the transformer allows it, is there any reason not to wire the primary side in series and use 230v instead of the way it is shown in the drawings using a 115v hot with a neutral wire? I have the Avel Y23675-0 which shows this connection as one option.
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  #38  
Old Tue 23 March 2010, 00:10
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
You can wire it 115V parallel or 230V series.
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  #39  
Old Tue 23 March 2010, 09:48
timberlinemd
Just call me: Steve #66
 
Arizona
United States of America
Thanks Gerald
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  #40  
Old Tue 20 September 2011, 01:22
Alan_c
Just call me: Alan (#11)
 
Grabouw (Western Cape)
South Africa
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Maybe this is a dumb question but I am batteling to get my head around this problem.

I have the same tansformer as shown in Geralds post 16 above. I want to connect it in parallel to give me 25v output. The wiring colours as shown on the transformer are as follows: Yellow-25, Yellow-0, Purple-25, Purple-0. If I want to connect in parallel I must connect the two 0's together and the two 25's together - BUT, how do I know which yellow is 0 and which is 25 (ditto for the purple), If I get it wrong they will be out of phase and I dont think the transformer will like that. - any suggestions?
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  #41  
Old Tue 20 September 2011, 03:03
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
One of the coils is yellow/yellow, the other coil is purple/purple (check with multimeter)

If you parallel 2 coils (similar rated voltage), you will either get nothing, or the right voltage. You won't get smoke.

(I have just confirmed this with Jan of Toroidal Technologies, who tells me that is not his transformer, but he wouldn't hesitate to try one way then the other)
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  #42  
Old Tue 20 September 2011, 04:40
Alan_c
Just call me: Alan (#11)
 
Grabouw (Western Cape)
South Africa
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Thanks Gerald.
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