Jet JWL-1840DVR, Operating Instructions And Parts Manual

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8.0 Operating controls
See Figures 8-1,8-2.
On/off switch (C) : Pull to start lathe, push to stop.
The safety key (C
1
) can be removed to prevent
unauthorized use of lathe. The safety key must be
inserted to restart the lathe.
[The JWL-1840DVR requires about 20 seconds
after shut down due to full capacitor charge.
Machine will shut off after capacitor has been
discharged.]
Note: If a power outage occurs during operation,
the lathe will not immediately restart when power
resumes. Cycle the ON switch to restart.
Remote switch : The remote emergency stop
switch (or E-stop) has a magnetic base, and can
be positioned on any metal surface of the lathe.
When remote switch is pushed, cycle the ON
switch on headstock to restart lathe.
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)
JWL-1840EVS: Switch can be moved while lathe is
running. Machine will slow to a stop, then reverse
direction.
JWL-1840DVR: In normal mode, forward/reverse
switch can be moved while lathe is running.
Machine will slow to a stop, then reverse direction.
In
education mode, first turn off machine (C) then
move forward/reverse switch. If switch is moved
during operation, lathe will slow to a stop, and
“RSET” or similar will appear in readout. Turn off
switch (C), wait to hear two “beeps”, then turn on
switch to continue.
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 (JWL-1840EVS only)
The 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.
8.2 DVR (JWL-1840DVR only)
See Figure 8-3.
The JWL-1840DVR uses a digital variable
reluctance motor, which monitors load on the motor
(i.e. pressure of chisel on workpiece) and adjusts
speed to compensate, while maintaining maximum
torque for each operation. The DVR delivers only
enough power to maintain set speed, thus
providing energy efficiency.