Dual 1245 Speed Problem

[Fitch1]

Thank-you curtisw99.

Yes, the increased resistance was my reasoning for asking in the first place... belt slippage reduces the resistance felt by the motor and the pole syncs at 120Hz instead of 60Hz. Re-wording my original question... If there is no belt slippage, does the problem go away naturally?

The sm840 motor doesn’t lock to 60Hz at startup, but if you add a little resistance (slow the plater with your finger) at startup, the motor will lock in to 60Hz.
This is the same thing a new tight belt can also do, but eventually the belt stretches. The module somehow uses this same phenomenon to lock the motor to 60Hz

I’ve had the module in my 510 for about 10 years and it’s never run a double speed.

 

[curtisw99]

Thank-you curtisw99.

Yes, the increased resistance was my reasoning for asking in the first place... belt slippage reduces the resistance felt by the motor and the pole syncs at 120Hz instead of 60Hz. Re-wording my original question... If there is no belt slippage, does the problem go away naturally?

Doubtful.
My 1249 (sm840) was not fixed by new belt alone