15
Figure 8-1: switch safety key
Speed control knob (D):
Clockwise to increase,
counterclockwise to decrease. Speed is displayed
as RPM (revolutions per minute) on digital readout
(E).
Change speed while lathe
spindle is turning to avoid overstressing belt.
Figure 8-2: operating controls
Forward/Reverse (F)
Switch can be moved while lathe is running.
Machine will slow to a stop, then reverse direction.
When turning with a face plate,
make sure both set screws on face plate are
tight before reversing spindle direction. Failure
to comply may cause face plate to spin loose
from spindle.
8.1
AC Inverter
The JWL-1840EVS Lathe uses the latest
technology in A.C. inverter drives to provide
infinitely variable spindle speeds within the
specified ranges (see
sect. 4.0, Specifications
).
The inverter controls the speed of the motor by
varying the frequency of the voltage supplied to the
motor. The inverter takes the 1-phase input from
the power cord and converts it to the 3-phase
output required by the drive motor.
The inverter provides an acceleration ramp that
eliminates the shock of normal starting. Also, a
braking feature eliminates long coasting periods
after the Lathe is turned off.
The 2-horsepower motor is designed for use with
inverter drives, and is balanced to reduce noise
and minimize vibration.
The A.C. Inverter is pre-programmed from the
factory.
DO NOT ATTEMPT TO ADJUST
INVERTER SETTINGS.
Use only the controls on
front of headstock. If you suspect a problem with
the inverter or inverter settings, contact JET
technical service at 1-800-274-6848.
A lightning strike or power
surge may cause inverter failure. When lathe is
not in use, disconnect power plug, or have a 3-
or 4-pole disconnect installed on the power
side.