Late response to your question, but I have the AB 1336 PLUS drive and have a 7.5HP spindle hooked to it and there is no way you could stall the motor. I am looking for the right control interface for my drive as it was not equipment with any of the GM modules. They seem to have GM1 PLC IO, GM2 RS232/485, GM5 devicenet. I did not see one that would let you use a 5V PWM signal. More detail please.