Peter Homann wrote:
> Hi Lester,
>
> The DigiSpeed-GX board contains an isolated 5V to 15V dc/dc converter. It
> accepts a PWM signal and converts it to an isolated DC control voltage
> suitable for Asian DC motor controllers, and VFDs.
>
> http://homanndesigns.com/store/index.php?main_page=product_info&cPath=1&products_id=21
Yes Peter - in which case one could just use a C1G and a DigiSpeed board
rather than the C11G which was being discussed.
Actually that IS a smaller, tidier solution - just requires ordering from
multiple suppliers :(
> Cheers,
>
> Peter.
>
> Lester Caine wrote:
>> Kirk Wallace wrote:
>>> On Wed, 2007-12-26 at 21:07 +, Lester Caine wrote:
Kirk Wallace wrote:
> On Wed, 2007-12-26 at 17:22 +, Lester Caine wrote:
>> Geert De Pecker wrote:
>>> I probably wrongly assumed that the voltage should come from the KBIC
>>> ... snip
> How much adjustment will the potentiometer give? Thanks.
http://cnc4pc.com/Tech_Docs/C11G_&_SIEG_X3_Electrical%20storybook.pdf
Check out page 7.
The thing to remember here is that the motor control pot on the Asian
mills is
at mains potential, so you need a totally isolated supply to drive that
bit of
the circuit. The boards I've played with a have a reasonable range on the
pot,
but I've only dropped to +9V from about 11V did not check how much further
it
would go.
The NEW boards from cnc4pc don't have the +12V requirement on board, so a
+5V
to +12V module may be required. The on board 12V relay has been replaced
with
a 5V one so the whole board just runs off 5V now.
>>> Thanks for the information. Does that mean there is a high common mode
>>> voltage (AC or DC) on the two pins next to the DC converter? Is the
>>> motor controller like the speed controllers for universal motors, or Do
>>> you have any keywords to search on the type of motor controller this is?
>> YES - basically controllers that only have a control pot on the machine are
>> likely not to be isolated from the main supply, and that is the reason this
>> little isolated control was provided. Controllers that actually have a 0 to
>> 10V DC input are more than likely not to require additional isolation as the
>> controls are already earthed (and in which case the isolated +12 can be
>> dropped altogether - just provide an earthed +12V). It is just the motor
>> controllers that do not provide an 'official' DC control voltage that need
>> care.
--
Lester Caine - G8HFL
-
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