RC-Monster Forums - View Single Post - MGM Low Voltage Cut Off

**MGM Recognizes and Solves the Problem!!!! -** 02.15.2008, 01:33 AM

I'll save myself some typing and just paste the email I received tonight.

Dear Mr. Barret,

we tested this motor/controller/battery combination and we find this problem.
When avarage current (no peak current) go over the 105% of nominal current (current fuse start activate), can caused this mistake and controller save absurd value (and can cut off motor also).
Please, send controller back to us, we update new SW version (from Feb. 13) to controller, without this problem. This new version has one advatage also - SW is possible update via www, your PC and USBCOM+ module, no necessary send to factory for next newest version.

Best regards,
Grisa Dvorsky
----- Original Message -----
From: Shon
To: mgm@mgm-compro.cz
Sent: Tuesday, February 12, 2008 5:11 AM
Subject: 22418 LVC

Greetings,

I am having trouble with my new MGM 22418 – 3. It seems that there are many others who are experiencing this similar issue.

My setup:

22418
Neu 1521/1Y
Flightpower EVO25 6S 5000mah 25c
HPI Savage

When I have the controller set to race mode everything works well. I don’t want to use this mode due to the loss of protection to both my Lipo and the overload protection. When I use reduce RPM mode the performance is poor, and I am pretty sure that the controller is reducing RPM even when the battery is full. When I use cut off mode the cut off is initiated anytime I go past roughly half throttle. My Lipo is a very high quality lipo with 125 amp continuous, 175 amp climb outs, 250 amp max burst capability.

I have attached a word document with screen shots from each of these settings. They were taken with the lipo fully charged and the truck being held off the ground. I also set the acceleration to 2.99, the slowest setting. Even when the truck is held off of the ground these symptoms persist.

Please notice the MAX PEAK CURRENT [A] reading for the 3 settings:

Race Mode – 260.55 [A]
Cut Off – 1679.1 [A]
Reduce RPM – 1515.05 [A]

It seems like there is something wrong with the calibration. In Race Mode the max peak current seems reasonable at 260.55 amps. In the other 2 modes the reading is over 1515 amps, which seems unrealistic.

Please let me know what I can do to remedy the situation. I have run auto tune several times and tested all of my connections. Let me know if you need any other information.

Thank you,

Shon Barrett

So there it is. The new software fixes the cut off problem I have been having, probably everyone else's as well. Also after you get the update you will be able to update the software from your own computer. Its like they read this thread and raced to get this solved (I know its a fluke but still....).

Mine is on its way there.

I replied and let her know about my controller frying the other night. Hopefully they will take care of it.

	(#36)
BashOn Guest Posts: n/a	MGM Recognizes and Solves the Problem!!!! - 02.15.2008, 01:33 AM I'll save myself some typing and just paste the email I received tonight. Dear Mr. Barret, we tested this motor/controller/battery combination and we find this problem. When avarage current (no peak current) go over the 105% of nominal current (current fuse start activate), can caused this mistake and controller save absurd value (and can cut off motor also). Please, send controller back to us, we update new SW version (from Feb. 13) to controller, without this problem. This new version has one advatage also - SW is possible update via www, your PC and USBCOM+ module, no necessary send to factory for next newest version. Best regards, Grisa Dvorsky ----- Original Message ----- From: Shon To: mgm@mgm-compro.cz Sent: Tuesday, February 12, 2008 5:11 AM Subject: 22418 LVC Greetings, I am having trouble with my new MGM 22418 – 3. It seems that there are many others who are experiencing this similar issue. My setup: 22418 Neu 1521/1Y Flightpower EVO25 6S 5000mah 25c HPI Savage When I have the controller set to race mode everything works well. I don’t want to use this mode due to the loss of protection to both my Lipo and the overload protection. When I use reduce RPM mode the performance is poor, and I am pretty sure that the controller is reducing RPM even when the battery is full. When I use cut off mode the cut off is initiated anytime I go past roughly half throttle. My Lipo is a very high quality lipo with 125 amp continuous, 175 amp climb outs, 250 amp max burst capability. I have attached a word document with screen shots from each of these settings. They were taken with the lipo fully charged and the truck being held off the ground. I also set the acceleration to 2.99, the slowest setting. Even when the truck is held off of the ground these symptoms persist. Please notice the MAX PEAK CURRENT [A] reading for the 3 settings: Race Mode – 260.55 [A] Cut Off – 1679.1 [A] Reduce RPM – 1515.05 [A] It seems like there is something wrong with the calibration. In Race Mode the max peak current seems reasonable at 260.55 amps. In the other 2 modes the reading is over 1515 amps, which seems unrealistic. Please let me know what I can do to remedy the situation. I have run auto tune several times and tested all of my connections. Let me know if you need any other information. Thank you, Shon Barrett So there it is. The new software fixes the cut off problem I have been having, probably everyone else's as well. Also after you get the update you will be able to update the software from your own computer. Its like they read this thread and raced to get this solved (I know its a fluke but still....). Mine is on its way there. I replied and let her know about my controller frying the other night. Hopefully they will take care of it.