On your regen card, make sure J1 & J2 jumpers are on for 60hp and R160 is in place for 460vac. This comes from a difference in the DCN parameter and actual hardware configuration. I doubt DCN is wrong but should verify. Intermittent connection between the 2407MC, Current Reg, and Regen Card could cause this so check ribbon cables. Noise could cause this too, make sure all contactors & fans have suppressors. If all that checks out I’d try the regen card next, then 2407MC. Wouldn’t rule out the power supply either and make sure it has a 20 ohm 5 watt loading resistor connected across the 5vdc output.
