Re: Fuses

I was looking at the rutex document again and I looked at the
schematic wrong lol. The fuses are shown between the power supply
and the drives not the drives and the servos. As you can tell I am
not a electrition. Thanks for the help. Good thing you guys were
here to straighten me out.
David Haddox

In CAD_CAM_EDM_DRO@yahoogroups.com, cnc002@... wrote:

>
>
> In a message dated 2/6/2006 9:44:46 P.M. Eastern Standard Time,
> elson@... writes:
>
> Why do you feel fuses are needed?
>
> Jon
>
>
>
> Actually, Jon is correct. It is a BAD idea to put fuses between

the

> drive)s) and the motor. The drive(s) themselves should be

protected by either

> breakers or fuses but, the drive(s) usually have an over current

protection built

> in. Now, you might put a thermal overload between the drive(s)

and the

> motors and connect the overloads so that they disable the
> drive(s) if they are tripped. This is the method used (when

anything is

> used between the motor and drive) by OEMs. If you don't have a

method to

> disable / stop the drive(s) when the connection between the drive

(s) and motor is

> severed, then you have a very good chance of burning out the drive

(s)

>
> My recommendation would be a thermal overload set just under the

maximum

> nameplate ampere rating on the motor and connect one of the

auxiliary contacts

> of the overload in series with the coil of a magnetic starter

which would

> supply the power for the drive(s). Depending on the type of

thermal overload, the

> auxiliary contact could be normally open or normally closed. You

would

> want the contact to be closed when the overload is in normal

operating condition

> and open when the overload is tripped.
>
> I hope this helps some.
>
> Randy Abernathy
> 4626 Old Stilesboro Road
> Acworth, GA 30101
> Ph / Fax: 770-974-5295
> E-mail: cnc002@...
>
> I furnish technical support, repair, and other related services

for your

> industrial woodworking machinery. My background as Senior Service

Engineer for

> the SCMI Group for nearly fifteen years with factory training,

combines with

> my extensive background in electronics, mechanics, pneumatics,

electrical and

> CNC machinery to offer you needed support for your machinery.
>
>
>
>
> [Non-text portions of this message have been removed]
>