High motor amps
Vol. 19 #1, Feb. 1992
Often high motor amps can be caused by one zone being too cold, usually a transition zone where melting is occurring.
Look at the screw design and measure along the barrel length to determine which heater zone is the transition zone and start increasing temperatures. A 10 to 20% drop in amps, with no increase in stock temperature, is not uncommon.
Another cause of high motor amps is the motor operating at too low an RPM. To utilize more of the available motor horsepower, a gearbox or drive pulley change is often necessary.
See also
Calibrate tachs
Decreased motor amps
Drive speed controller
Extruder drive
Heater amps
Max RPM
Rules of thumb
Screw design
Temperature control