Re: 5V+ Supply for Gecko?

>
> I don't have any experience with the Gecko Servo motor drives, but

I looked

> at the G320 docs, and it appears that the GND terminal is for the

MOTOR

> SUPPLY ONLY. You should NOT connect the PC or Controller supply

ground to

> the Gecko.
>
> Also from the Gecko manual:
>
> "The encoder must be a digital quadrature TTL output type that

operates on a

> single +5VDC power supply. The power
> supply current rating must be less than 50 mA. It should be at

least a 200

> line encoder. If the encoder supply current is
> more than 50 mA, use an external +5VDC supply. IMPORTANT: Connect a

470 ohm

> resistor from TERM. 6 to TERM.
> 7 if an external power supply is used for the encoder."
>
> If your encoder draws more than 50mA, you will need to use an

external +5VDC

> supply for the encoder. This supply should NOT be the one that is

in your

> PC, or in your controller. It is not specified, but it looks to me

as if you

> would connect the GND of the external +5VDC encoder supply to Pin 6

on the

> Gecko, and to the GND of the encoder, and connect the +5VDC from the
> external encoder supply to the +5V line of the encoder only, and

make no

> connection between this +5VDC and the Gecko.
>
> Andy Wander
> Verrex Corporation
>
>
>

The Gecko's have an internal buss supplied from the Motor + and -
leads. The encoder - is the same as Motor - . This will in most
circumstances put it at some voltage above or below the PC ground.
The Gecko has a small internal regulated supply for its CMOS based
circuity and the +5 for the encoder is derived from that and is
limited to 50ma. If you need more than that you need a separate +5
supply with it's ground referenced to Motor - (internal Gecko buss
ground). I know you said all of the above in your post but I just
wanted to look smart and feed my ego!