>This board interfaces with 3 external power relays.These relays are
>signaled from 3 other reed relays on the board which are
>opto-isolated from the signaling PIC.
>When the power relays operate alone (not connected to the machine's
>motor) there is no problem. But when they are connected problems
>start. These three relays control a two speed bi-directional  220V

I get the same problem with a 8031 and driving relay with switch high
currents. The solution I found is to separate the power for the relay
and the micro. I put an opto-coupler between the output of the micro
and the transistor which drives the relay. These solution seems to be
redundent, but it run very well without problem.

Regards,
        Philippe.