In try, in short: The mount tracks, that means the ARM controller
sends pulses for motor steps. The servo pics try to follow with
small or no lag, David programmed the control loop with P, I and D
parameters. The higher the lag, the higher the power to the motor by
increasing the PWM duty, the more torque it delivers but also the
current thru the motor increases. Too tight a worm, significant
disbalance, ... can cause it. A significantly high power consumption
while tracking is not good for motor and your battery, so this is
one of the indications for a stall condition. Gemini signals to you
with stall messages and beeping that you should improve the
situation. In RA a loose gear mesh is no problem since the motor
always moves into the same direction even with guiding. Temperature
changes may influence the gear mesh a bit, cooling down at night
makes the mesh tighter and if the mount is new the worm and wheel
may need to "run in" a bit like the motor in a new car.
You can watch the current lag and PWM duty needed at the
MENU->MOUNT->Balance screen.
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Okay thanks, Yesterday I got some strange erratic beeping right
before the mount reached its limit. At the same time, I was
getting "RA Stall!" on the display. The spring-loaded worm was too
tight. Can you explain this please?
