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christipher saint denis
Registered
Username: Dzlqw4
Post Number: 5
Registered: 08-2006
| | Posted on Saturday, March 31, 2007 - 10:20 pm: | 
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Here are photos of my AnTeck PS-8N70Rxx power supply. The close-ups are the 70Vdc 11A unregulated output block and the 5v 1a regulated output block. I drew in the + c - marking because they did not show up in the close-up of the 70Vdc output.
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Gerald_D
Registered
Username: Gerald_d
Post Number: 1203
Registered: 11-2005
| | Posted on Sunday, April 01, 2007 - 03:24 pm: |
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That terminal block for the output is going to cause some headaches......
Gecko wants you to take a wire from each drive directly to the power supply. With 4 Gecko's, it is going to be impossible to get 4 wires safely under each screw of the terminal block.
I wonder if the chassis of your supply is connected to "-" terminal of the output? |
christipher saint denis
Registered
Username: Dzlqw4
Post Number: 7
Registered: 08-2006
| | Posted on Sunday, April 01, 2007 - 07:13 pm: |
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I can call the Anteck tomorrow and ask if the chassis of my supply is connected to "-" terminal. Is there any other way I can tell?
mutimeter reading from the output terminal block:
35Vdc between + and -
70Vdc between + and c
70Vdc between c and -
Is this what I should expect?
As far as wiring the Geckos to that output block what do you suggest?
Thanks again for you time. |
Gerald_D
Registered
Username: Gerald_d
Post Number: 1206
Registered: 11-2005
| | Posted on Sunday, April 01, 2007 - 08:45 pm: |
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Christipher, you should be reading 70V DC between + and -, not 35V DC.
When the power supply is switched off, AND HAS BEEN OFF UNTIL THE +/- voltage HAS DROPPED TO 0V, ie. the capacitors have discharged, measure the ohms between the chassis and the terminals.
Standard practice with a Gecko supply is to connect the - to the chassis, to the whole control box, and that is also connected to the ground of the incoming 110V line. Which means a lot of points need to be connected to those terminals. In your case, take good wires from those two terminals to the connectors on the DIN rail. The DIN rail connectors are easier to bridge for multiple wires. |
christipher saint denis
Registered
Username: Dzlqw4
Post Number: 8
Registered: 08-2006
| | Posted on Sunday, April 01, 2007 - 09:33 pm: |
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I measured the ohms between the chassis and the terminals and there is no continuity between them. |
christipher saint denis
Registered
Username: Dzlqw4
Post Number: 9
Registered: 08-2006
| | Posted on Sunday, April 01, 2007 - 10:50 pm: |
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I downloaded my multimeter manual and learned how to read the multimeter correctly. Those readings I posted earlier were incorrect.
multimeter reading from the output terminal block:
49 Vdc between the + and -
My 110Vac power line in reality measures closer to 98Vac. Is that why I am only getting a 49Vac output from my power supply? |
James Webster
Registered
Username: Wti
Post Number: 30
Registered: 02-2007
| | Posted on Sunday, April 01, 2007 - 11:27 pm: |
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Is the power only 98VAC everywhere in your house, or just at that outlet? |
Mike Richards
Registered
Username: Richards
Post Number: 99
Registered: 05-2006
| | Posted on Monday, April 02, 2007 - 01:48 am: |
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That reading is curious. Even if you had 120VAC available, the unregulated DC would be about 60V. My 50V toroid transformer produces a measured 70VDC (50 * 1.4 = 70V).
You have something connected to the output of the power supply (red wires). Is it possible that your load is too large for the power supply? (I can't imagine Geckos and steppers pulling an 800VA down that far. The four G202s or four G203s that I use and four 3-amp motors don't pull my 500VA supply down at all.) |
DocTanner
Registered
Username: Doctanner
Post Number: 43
Registered: 11-2006
| | Posted on Monday, April 02, 2007 - 02:53 am: |
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Christipher,
Cheap multimeters are notorious for unreliable readings.
DocTanner |
christipher saint denis
Registered
Username: Dzlqw4
Post Number: 10
Registered: 08-2006
| | Posted on Monday, April 02, 2007 - 05:42 am: |
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I will purchase a better multimeter and try taking some new measurements tomorrow. There was no load on the supply when the reading was taken. Those two red wires were attached to empty terminal blocks on my din rail.
Thanks for the help. |
Gerald_D
Registered
Username: Gerald_d
Post Number: 1207
Registered: 11-2005
| | Posted on Monday, April 02, 2007 - 06:55 am: |
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Christipher, in the photo with the meter I see you used 2 red wires from the power supply terminals. May I please make a very strong suggestion that you use 2 different colours for + and -. It is too easy to make mistakes when they are all the same colour.
I also believe there is something wrong with your meter. Maybe it was damaged at some time, or maybe it needs new batteries. |
Christopher Saint Denis
Registered
Username: Dzlqw4
Post Number: 13
Registered: 08-2006
| | Posted on Wednesday, April 04, 2007 - 02:44 am: |
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I went and purchased an Idea #61-702 multimeter, which was ten times the cost of my cheap multimeter.
"You get what you pay for."
Once again I find truth in the old saying.
The readings from the new multimeter seem on par with expectations. My incoming 110v line reads 123 Vac and the output from my power supply reads 68.8 Vdc.
Gerald,
Thanks for the heads-up concerning wire coloring. A nest of red wires can get pretty disorienting. It was especial silly of me considering I had a spool of white and black sitting in the next room. I wired up the Pmdx-120, one Gecko G203, a stepper, and the relay for the router. I have got motor movement and I can turn a 110v light bulbs on and off through Mach 3 with m3, m5. All that with out any fireworks and smoke!
Thanks for everyone’s input. |
Gerald_D
Registered
Username: Gerald_d
Post Number: 1213
Registered: 11-2005
| | Posted on Wednesday, April 04, 2007 - 07:09 am: |
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"I have got motor movement and I can turn a 110v light bulbs on and off through Mach 3 with m3, m5. All that with out any fireworks and smoke!"
I don't think you realise how much pleasure I get out of hearing something like this! CONGRATULATIONS! |
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