--- On Thu, 17 Apr 97 09:05:39 MST [email protected] wrote:
> Dear Friends,
>
> We have a large piece of lab equipment that uses 3 vacuum pumps and
> several power supplies.
>
> The problem is that the controllers and power
> supplies have their own EMI filtering.
> The leakage current
> of each one is between .5 mA and 1 mA, well within the limits. But
> when we install them inside of our end product, these add together
> with the EMI filters of the end product to create a high leakage
> current of 6 mA.
>
> Ray Russell
>
-----------------End of Original Message-----------------
Ray:
If this is a large equipment, are you using a three phase power feed?
If so, can you add (!) some capacitance from one phase to ground which will
balance the leakage currents? You might be able to just about "null out" most
of the leakage current. This sounds too simple, so it must be illegal some way.
--------------------------
Name: Ed Price
E-mail: [email protected]
List-Post: [email protected]
Date: 4/17/97
Time: 11:10:44 AM
--------------------------
