Could you post your schematic?
switching high inductive loads is always a challenge.
Some things that may help:
- Check for Ground Loops
- reverse diodes accross all coils.
- RC filters across the relays contacts
- RC Filters at the PICs and Drivers I/O Pins
- Many large Ground Planes
- Relays as far as possible away from the PIC
- opto-isolators between MCU and drivers
- If switching AC, toggle the relays at zero crossing !
etc...
regards
Ralph
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