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Old 10-30-2003, 10:17 PM   #31
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What, you don't speak Japanese?

The unit only came with the Japanese instructions unfortunately but it's pretty easy to figure out.
The switch on the left that says equalize/condition switches from 5 amp to 1 amp discharge.
The switch on the right with NiMh and NiCad switches from .9V to .1V cutoff.
The Start button is pretty self explanatory I think.
The 12V input harness runs the cooling fan.
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Old 10-30-2003, 10:41 PM   #32
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ummm No.

I know how to use the unit. I was just curious to see the translated version.

Besides, had no idea what the discharge values were.

Thanks.
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Old 10-31-2003, 01:10 AM   #33
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Quote:
Originally posted by dpaton
I didn't like any of them very much, so I built my own.

Computer controlled, per cell discharge at 20A to about 1V, then ramps down to 1A at 0.9V. Auto cutoff and bounce management.

Unfortunately, it's a bit unwieldy to take to the track right now (big load bank, computer, ratsnest of prototyped parts...), but I'm working on that...

-dave

dave,

How'd you manage to pull 20amp per cell... I can only manage 2amperes as the lowest resistor I can find is 0.33 ohms and I'm worried I might burn my relays if I parallel in more resistors....

My homebrewed tray uses op-amps to monitor cell voltage and transistor-driven relays for cutting off the load resistors...

A picture would be appreciated...
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Old 10-31-2003, 10:49 AM   #34
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Quote:
Originally posted by TRF512
dave,

How'd you manage to pull 20amp per cell... I can only manage 2amperes as the lowest resistor I can find is 0.33 ohms and I'm worried I might burn my relays if I parallel in more resistors....

My homebrewed tray uses op-amps to monitor cell voltage and transistor-driven relays for cutting off the load resistors...

A picture would be appreciated...
My load bank is a bunch of old heating elements from toasters connected in parallel. My DVM won't reliably read below 1 ohm tho, so I can't tell you what the actual R is Judging from my max Iload, probably around 0.03 ohms, give or take a few. The bank itself has a capacity of about 3kW, so I get actual DC resistance, not the heat-dependent kind like toasters and light bulbs use.

I use a tight feedback loop with a very very very high frequency PWM chopper control to maintain the discharge rates, with the current and voltage read in with 16bit ADCs.

Active control is the only way to go for things like that.

I'm currently rebuilding it tho, since there was some latchup that took out a couple of the port pins on my microcontroller, destabilizing the feedback loop and frying a pack. Lucky for me it was a set of 1700SCRs

Pictures will come when my camera starts cooperating again. Right now it's on the fritz.

-dave
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Old 10-31-2003, 11:36 PM   #35
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If I had to pick a discharge tray I would opt for the rayspeed as it is the only one I know of that is intended to tray the new NiMH's.
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Old 11-05-2003, 12:57 AM   #36
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Isn't the rayspeed tray very similar to the eagle tray? seems to me like a more expensive version of the eagle tray. Anyone with experience on the eagle tray?
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