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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> MRC Charger Product Support (i.e. Super Brain, etc) >> MRC Super Brain 989
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MRC Super Brain 989 - 5/30/2007 12:04:29 AM   
george fisher


 

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Joined: 9/12/2006
From: West Linn, OR, USA
Status: offline 		I have a T Rex 600 with The 5000ma battey. The battery will not take a charge and recoginzes the battery as only 5 cells instead of 6. Is this a charger problem or battery problem?
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RE: MRC Super Brain 989 - 5/30/2007 3:12:49 AM   
guver


 

Posts: 8440
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		I thought the 989 required the user to input the cell number in. If you've done that and it is showing the wrong number of cells or an error then I would stop and check each individual cell in the pack to make sure none are too low. If they are all the same then perhaps you can input 5 cell and start chargeing.

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RE: MRC Super Brain 989 - 5/31/2007 4:47:49 PM   
Tim@MRC


 

Posts: 311
Joined: 7/24/2006
From: Edison, NJ, USA
Status: offline 		If you input the cell number as a 6 cell, and the voltage on the battery is really low compared to what it should be, then the charger may very well only recognize it as a 5 cell. At that point, you may get an error telling you the battery voltage is too low. This is a safety feature built into the charger. This is to avoid a mis setting and possibly over charging a battery. What's th voltage in the battery before you tried to charge?

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RE: MRC Super Brain 989 - 6/8/2007 7:29:26 PM   
AHR43


 

Posts: 138
Joined: 3/13/2004
From: Houston, TX, USA
Status: offline 		Hi Tim[at]MRC,

What is the power draw in watts of the 15V/10A power supply?

Our calcs came up with appx. 23w. Is that close?

Team AHR43 is trying to decide whether to go with a power inverter or a gas generator to provide pit power. Know the 989 wattage rating will help us decide. Thanks.

//AC//

< Message edited by AHR43 -- 6/8/2007 8:18:07 PM >

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RE: MRC Super Brain 989 - 6/11/2007 7:58:35 PM   
Tim@MRC


 

Posts: 311
Joined: 7/24/2006
From: Edison, NJ, USA
Status: offline 		The most wattage that the power supply would draw would be 150 watts (15 volts at 10 amps). However, for R/C car stick packs it would be more realistic to see 40 to 60 watts.

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RE: MRC Super Brain 989 - 7/7/2007 6:02:53 AM   
dark96


 

Posts: 23
Joined: 1/10/2007
From: burnet, TX, USA
Status: offline 		I was wondering if anybody else had this problem when charging a nimh . i was charging my 3800 NiMH duratrax battery and noticed that it went past the set 3800 mah mark i had programed, and didnt stop charging. I was just curious is there something else I need to setup on there or is this normal and I need to keep an eye out for it? I didn't hear it beep when it hit the 3800 mark either was the problem. just curious..thanks...also what should i set the cutoff peak mV @ i dunno if i have that part set up correctly..cause in the manual it says 5 v per cell, so should i set it up @ 30 mv?

< Message edited by dark96 -- 7/7/2007 6:15:33 AM >

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RE: MRC Super Brain 989 - 7/7/2007 6:47:11 AM   
guver


 

Posts: 8440
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		It's not really a problem , but rather can charge to 112% of capacity. It's not adjustable and I have one going right now to test the figure.

I'm guessing a 150-200% of capacity safety is built in. The correct way to terminate is to rely on the peak detection rather than capacity. A super dooper brain would take into account the rate vs capacity and adjust the max % accordingly. Maybe have to allow the engineer to chime in about that one.

EDIT: tested twice at 112% of capacity setting while at max rate of 4C.

< Message edited by guver -- 7/7/2007 7:17:37 AM >

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RE: MRC Super Brain 989 - 7/7/2007 4:12:13 PM   
dark96


 

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From: burnet, TX, USA
Status: offline 		so in otherwords there isnt much i can do? what bout the mV cutoff? any suggestions as to what i should set that as on my 6 cell nimh am i right in guessing i should set it up @ like the manul says @ 5 mV per cell? and what were u charging btw?

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RE: MRC Super Brain 989 - 7/7/2007 5:03:39 PM   
guver


 

Posts: 8440
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		I guess I'm not understanding what it is you'd like to do with it. If perhaps you'd like it to shut off right at 3800 then a capacity setting of 4256 could be used.

The capacity cut-off is merely a "safety stop" or a "backup" and should not be used normally. The peak detection (mv value) is what is normal for stopping charge. It is set as a "per cell" value so set it to 5 mv.

ps I happened to be chargeing a 6 x 3800 nimh and the stop code is C.2 when the capacity stop has been reached. Your particular battery might just hold more than 3800 mah and if so it is a good one.

< Message edited by guver -- 7/7/2007 5:05:21 PM >

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RE: MRC Super Brain 989 - 7/7/2007 8:16:38 PM   
dark96


 

Posts: 23
Joined: 1/10/2007
From: burnet, TX, USA
Status: offline 		i guess what my main question now is is what to set the peak dectection at...and i guess if i set it for 5 it will mean per cell in the charger. i sorta confused myself there and thanks for all the hely guver.

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RE: MRC Super Brain 989 - 7/7/2007 11:06:11 PM   
guver


 

Posts: 8440
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		Yes, you got it. It can be confusing because some chargers want a total value and some need a "per cell" value. This 989 uses a per cell value and then probably multiplies it by the number of cells that you input into memory. The previous 959 and 969 and 977 used a "total" value.

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RE: MRC Super Brain 989 - 7/9/2007 2:50:40 PM   
Tim@MRC


 

Posts: 311
Joined: 7/24/2006
From: Edison, NJ, USA
Status: offline 		The capacity setting on the 989 is more for setting the profiles and charge settings. This is to confirm that you have the correct battery connected for the charge settings selected. It is very common for a battery to go over the rated capacity, sometimes by as much as 5 - 10 %. As far as the delta peak setting, you can use anywhere for 5 - 10 mv per cell, but I tend to be a little conservative here and I use 5 mv. You can use the 5 mv per cell, and then by checking the charge capacity and the final temperature of the battery to determine whether the battery is fully charged or not, and then make any adjustments to the mv setting then. A higher setting makes the charge less sensitive to peak, while a lower setting makes it more sensitive to a peak.

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RE: MRC Super Brain 989 - 7/11/2007 2:10:35 PM   
AHR43


 

Posts: 138
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From: Houston, TX, USA
Status: offline
quote:

ORIGINAL: Tim@MRC

The most wattage that the power supply would draw would be 150 watts (15 volts at 10 amps). However, for R/C car stick packs it would be more realistic to see 40 to 60 watts.


We were way off trying to determine power consumption using an Ohm's law circle. We went back to our RS Basic Electronics book and are now using the power circle. Thanks, Tim.

Does the 989 SuperBrain have any specific requirement for type of 115vac input? Specifically, is Modified Sine Wave/Semi-Sine Wave acceptable, or does the 989 require [Full] Sine Wave for an input waveform to the power supply? Does it matter?

Also, will the 989 trickle charge a full size AGM (Absorbed Glass Mat) battery?

We are still gathering data on inverter vs. gas generator use in the pits. We really want to make a case for a 1500W inverter powered by an auxillary AGM battery instead of a 1000W gas generator. However, the Honda EU1000 generator we are looking at features full sine wave output. That makes it a better match for the 989?

Here is the link to our source information: http://www.almac.co.uk/proven/Inverter2%20Battery%20charge%20.htm

//AC//

< Message edited by AHR43 -- 7/11/2007 2:13:28 PM >

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RE: MRC Super Brain 989 - 7/11/2007 4:44:53 PM   
Tim@MRC


 

Posts: 311
Joined: 7/24/2006
From: Edison, NJ, USA
Status: offline 		How many volts id the AGM battery? Why not hook the chargers directly to the AGM battery?

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RE: MRC Super Brain 989 - 7/11/2007 11:55:05 PM   
AHR43


 

Posts: 138
Joined: 3/13/2004
From: Houston, TX, USA
Status: offline
quote:

ORIGINAL: Tim@MRC

How many volts id the AGM battery? Why not hook the chargers directly to the AGM battery?


12vdc x 95ah (ampere/hour). Primary method of recharging AGM battery will be our truck's alternator system while en-route return from race site to home. We always like to have two ways to do something. Alternate method of recharging AGM battery will be 989 in trickle mode at home site? We are looking at a 'Power Patrol Sealed Lead Acid (AGM) battery offered by Interstate All Battery Center here in H-town. They have AGM-specific [trickle] battery chargers on the shelf for sale. We don't want to buy another battery charger for the AGM if the 989 will do the deed.

Here is our source link: http://www.batterystuff.com/tutorial_battery.html#3

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RE: MRC Super Brain 989 - 7/12/2007 2:01:10 PM