Hot ESC without doing nothing - HK blueseries - RC Groups
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Jul 05, 2012, 04:47 AM
Registered User

Hot ESC without doing nothing - HK blueseries

Hi dear,

I'm installing an hobbyking ESC blueseries rated at 30A, trying to let it connected to
battery without any driving signal leads the ESC to come hot... in other word, no current
to motor and the ESC is hot (my hand can touch it without excessive pain, say 45-50 degree I think)... is it normal?
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Jul 05, 2012, 05:41 AM
Registered User
That doesn't sound normal to me.

If you plug a speed controller in to a battery and a motor but don't plug the cable in to the receiver it should not heat up.
Jul 05, 2012, 06:28 AM
Registered User
teslahed has the right idea, unplug the 3 pin control line and see if it gets hot.

The ESC's contain a seperate regulator designed to power other devices other than the motors. If this device is pulling too much current, or if the ESC is connected to a device with other ESC's it is possible for the esc's to have a bit of a battle to supply varying voltages anomalies.
Jul 05, 2012, 01:17 PM
with no load, no its not normal. you say the little servo connector is not plugged in, so is probably a bad ESC. try it with another motor to see if it is a shor in the motor or the ESC is bad.
Jul 05, 2012, 11:08 PM
vic20owner's Avatar
bad speed controller
Jul 06, 2012, 12:16 PM
Registered User
Originally Posted by vic20owner
bad speed controller
yeah, thanks guys, just one esc out of six was bad, it can also drive the motor but it's produce totally random sounds with any attempt to programming, it starts motor without any sound originally posted, it became hot pretty soon..

-hobbyking blueseries 30A-

how much often happens to find a bad esc in a set? This is the first set for me, next time I will order one or two in addition

thanks again
Jul 06, 2013, 05:40 AM
Registered User
I had a similar problem with my tricopter with the blueseries esc. One esc is getting really hot when the servo cable is plugged in, up to feel pain on my skin. It's not getting hot when the servo cable is removed.

So i removed this esc+motor and left the other two plugged in, with servo cable, and surprisingly one of the other two got really hot this time, while it had no problem when all three where plugged in.

Any idea ?

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