Moonlight High Resolution Stepper Motor Quick Start Manual page 10

Motor Trouble Shooting guide
The amount of slip can be adjusted on the slip clutch by adjusting
the tightness of the slip clutch ring. For manual knob operation of
the focuser, turn the silver knurled ring loose. For motor operation
of the focuser, tighten the silver knurled ring. To adjust the
knurled rings tension, it helps to hold the manual knob still with
your right hand and turn the clutch ring with your left hand.
Holding the manual knob in place will keep the shaft from turning,
allowing the clutch ring to tighten/loosen the clutch
Focuser adjustment guide for motor options if focuser slips
under heavy loads. Slipping can be caused be either a loose clutch
setting or drawtube to shaft pressure setting to low. Check movement of manual knob to verify what adjustment
is needed. If the manual knob on the right does not turn when the focuser is slipping, then the slip clutch is is
not tight enough on the motor.( tighten clutch as shown in motor documentation). If the manual knob on the
right is moving but the drawtube is not moving, then the drawtube is slipping and the shaft to drawtube pressure
needs increased a small amount. See lifting capacity adjustment shown above.
To verify motor is moving, check the black hub part of the clutch that is connected to the motor shaft for
motion. If you look carefully at the black nub that attaches to the motor, you may be able to see it turn as a
small set screw should be noted turning around with the black hub. The black hub is on the left side of the slip
clutch. The black larger pad side of the clutch is set screwed on to the main shaft. As the motor turns the small
black hub part of the clutch will move with it. It is set screwed on to the motor shaft. This is a good way of
testing to see if the motor is actually moving. The whole clutch as a unit should rotate with the motor if it is
tight. If it is loose, then only the small hub on the motor side will be turning with the motor.