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Message: <blockquote data-quote="s-band" data-source="post: 1151261" data-attributes="member: 407744">As John says, the error is due to lack of feedback pulses if it's trying to move but can't thereby preventing damage if the dish jams. If I forget to switch the motor supply on it takes about 2-3 seconds to trip. It will also trip if the pulse rate is too low e.g.if  I reduce the motor speed too much. I have something in the back of by mind that it would also trip if there are pulses when movement is not commanded. I think that happened when I forced an actuator to move manually. Check that you don't have any intermittent connections in the pulse sensor lines.</blockquote>