Sigma 2 eq help
Does anybody know how to change from AUTO to MANUAL charge on this charger. I'm sure it's easy but I'm stuck. The instructions appear to be less than clear.
For safety purposes, this charger is designed to automatically deliver a 1C charge rate to batteries of Li-Ion, Li-Po or Li-Fe, based on the user
selected battery capacity unless over-ridden specifically for batteries designed to accept 2C charging.
Example: Li-Po cell of 1500mAh capacity : 1C = 1500mAh ( = 1.5A ) charge current
Thanks for the reply, however my (NiMH) cells require a 2300mAH charge for 72 mins for a full quick charge. I can setup 2300mAh but not the time period!!
Yes, those instructions suck, but that's typical for the lot of those type.
What batteries type are you charging? Yes, I know NiMH, but what do you DO with them? Power a motor, servos, RX, etc? It makes a difference.
For ANY NiMh you do NOT want to set a mA limit UNLESS you are using it as a safety feature. These are NOT lipo, and do not 'fill' the same.
To get 2300mA IN to them you will effectively overfill them so you may see up to 3000mA (random guess) going in DEPENDING on the fill rate and the capacity state of the battery before you start charging. Excess charge is bled off as heat. If you over charge at too high a rate and the delta-V (the way the charger knows to STOP) does not function properly the batteries can over heat and be damaged.
You probably have some NiMh powered small devices in the home like a portable phone, right? You put them in the cradle they are charging ALL THE TIME, but at a very low rate. You could put a 'meter' in there and measure the capacity (mA) going in. Say there was a 2000mA AA in there, after a month you might find you put 10,000mA into it, without harm. Because the rate is so slow the excess voltage is shed as low grade heat. If you tried to 'trickle charge' a lipo like that you would be rewarded with a nice fire.
In NiMh [Auto] the charger determines the fill rate based on some criteria the engineers set up. BUT you STILL set the TOP limit even in Auto.
On [Manual] you decide the rate and the charger does that rate only.
Generally there is not a huge advantage to Manual unless you clearly know what you are setting it for and why.
There is a BIG advantage to know what MAXIMUM rate you are setting and why. Too low and delta-V may not trigger off correctly. Too high and it may trigger prematurely or be hard on the batteries.
In general set the rate from 1/2-1C. I'd use 1/2C for low output NiMh and 1C for power grade. I'd only go higher if I knew for sure the batteries were good for it.
This should work to change the setting. Go to the screen that says:
NiMh - Charge - Auto
Cur - Limit - 0.8A (whatever it is set on, that's the TOP rate you can change. It won't go higher than that setting)
Press the [Start] button. The [0.8A/rate] (whatever it is set at) will start to blink. You can now set this higher or lower with the <DEC INC> arrows on the panel.
Instead push BOTH DEC and INC at the same time and HOLD.
AUTO should switch to MANUAL.
Do the same again to switch back.
Note-I just looked at your post history. Did you read that info link I gave you awhile back? If not your really ought to. I think you are not understanding NiMh basic charging principals.
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