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Battery power supply to servo, stand alone, help.

Old 07-15-2020, 02:29 PM
  #1  
BF Lesley
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Default Battery power supply to servo, stand alone, help.

Thank you in advance. A friend of mine gave me a project of a bruder dirt conveyor having a servo to power the belt. It works great when I power it off of an RC car receiver. However trying to power it off of a battery pack of any kind is not working. The servo is a Hobico CS-70. I've tried 4 AA batteries for 6v, a 2s lipo for 7.4v, but it only engages and will not actually turn. Any advice?
Thanks and have a great day.
Bert
Old 08-01-2020, 12:21 AM
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AndreyT
 
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Originally Posted by BF Lesley View Post
However trying to power it off of a battery pack of any kind is not working. The servo is a Hobico CS-70. I've tried 4 AA batteries for 6v, a 2s lipo for 7.4v, but it only engages and will not actually turn. Any advice?
You have to connect ground wire of your battery pack to the receiver ground wire. Did you remember to do that?
Old 08-01-2020, 11:26 AM
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Your servo has 3 wires at the plug. Red and black are the battery power wires, positive and negative. The 3rd wire is gets a control signal from the receiver, though it actually originates at the transmitter.
the servo will not work withonly the battery connected - it needs the control signal, which can come from a receiver or from a servo driver which are also referred to as a servo tester.
The info about the ground wire is correct, it has to be connected, but by itself will not operate a servo. It has to have a control signal.

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