Spektrum/Savox brown out problem
08-15-2012, 05:01 PM
#1
Spektrum/Savox brown out problem
Hey guys, i just bought a savox 1258 tg servo to put into my b4.1. It has an Orion r10 race in it, orion vst pro 17.5t motor, and spektrum sr300/dx3e tx/rx in it. When the motor is plugged in, once i turn the servo all the way to one side, the light on the reciever goes out, the servo centers and the light comes back on. When the motor isnt plugged in, the servo works fine. Can someone please help me? And if i need to buy something, please post a link to it.
Thanks!!
Thanks!!
08-15-2012, 06:53 PM
#8
Tech Fanatic
iTrader: (13)
Here we go!
Your ESC contains a decently powerful "BEC", or Battery Eliminator Circuit. This device takes battery voltage and steps it down to 6v, which is what we use for our servos, radios, and the like. It is microprocessor-controlled to provide a fixed amount of amperage.
When dealing with a power supply, if you draw amperage beyond the supply's ability to deliver, you will see a decrease (Sag) in output voltage. This is BAD.
The Savox servo is a notorious power-hog, and under high load, can pull so hard on it's supply line, it causes the voltage to drop (sag).
Then the voltage sags, your radio underoes a "Brown out" which actually takes it offline for a few moments. As your ESC's own control hardware is powered by the BEC it contains, this can/will cause steering and throttle "Glitches."
Your motor, being rather hot, can cause additional problems by pulling down on the BATTERY so hard that the BEC starves for power, causing brownouts.
All of this is fixed, typically, with a Glitchbuster capacitor, or something like it. These capacitors act as temporary energy storage, charging when the load is low, and providing additional power when the load is high.
In more extreme cases, the internal BEC isn't up to the task at all, so you wire in an External BEC to take over for it, as the external BEC will have a higher maximum amperage.
Your ESC contains a decently powerful "BEC", or Battery Eliminator Circuit. This device takes battery voltage and steps it down to 6v, which is what we use for our servos, radios, and the like. It is microprocessor-controlled to provide a fixed amount of amperage.
When dealing with a power supply, if you draw amperage beyond the supply's ability to deliver, you will see a decrease (Sag) in output voltage. This is BAD.
The Savox servo is a notorious power-hog, and under high load, can pull so hard on it's supply line, it causes the voltage to drop (sag).
Then the voltage sags, your radio underoes a "Brown out" which actually takes it offline for a few moments. As your ESC's own control hardware is powered by the BEC it contains, this can/will cause steering and throttle "Glitches."
Your motor, being rather hot, can cause additional problems by pulling down on the BATTERY so hard that the BEC starves for power, causing brownouts.
All of this is fixed, typically, with a Glitchbuster capacitor, or something like it. These capacitors act as temporary energy storage, charging when the load is low, and providing additional power when the load is high.
In more extreme cases, the internal BEC isn't up to the task at all, so you wire in an External BEC to take over for it, as the external BEC will have a higher maximum amperage.
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