Quote:
Originally Posted by Leo.G
The stupidest thing, is there a separate earth cable to either of the motors?
This won't sound stupid to you because I'm sure you've run across the problem elsewhere but if there is check it's tight and a clean connection.
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Leo,
This Goto Dob and most Astro EQ and Az Alt mounts run on extra low voltage ie: 12V DC either via a switch mode plug in type power supply or integral or standalone Battery. The motors are usually small stepper type or servo type extra low voltage DC. There is no requirement for an earthing conductor attached to the general mass of earth under ASNZS3000 for these motors or for that matter the mounts as well.
I had quite a few mounts and never seen provision to connect an earthing conductor. Unless of course it’s a non commercial home made mount with small AC motors ( which wouldn’t be approved and C ticked for connection to 230V mains outlets in any case )
With respect to earthing , you maybe referring to 230V single phase AC motors which are not used in commercially manufactured Astro mounts etc….
Cheers
Martin