Specifications

Southwestern Industries, Inc.
ProtoTRAK

SMX K2, K3, K4 & Retrofit Safety, Installation, Maintenance, Service & Parts List Manual
53
3.5.1.1 Spindle Stalls or Turns-Off During Machining (For Machine
with the Optional Spindle Control Drive)
During machining, the spindle turns off and loses power. First check incoming voltage
and connections.
Possible Cause
Check This
Machine Tool and Setup problem Check the type of material being cut, type and size of
cutting tool, RPM, and Feed rate. Also check the
condition of the cutter to verify that the cutter is not
dull. See Machine Tool & Setup Section 4.1
Drive Belt in the head is slipping Check the alignment, condition, and tension of the
Drive Belt.
Cut more than the machine is capable Check width and depth of cut
Spindle Drive Thermal Overload Relay
has tripped
IOUT - Current Out (located on the Spindle Drive)
cannot exceed 12.75A for K2/K3 and 21A for K4 for
more than a few minutes. When the Overload Relay is
tripped, an "oL1" error occurs shutting off the Spindle
Drive. The harder the Spindle Motor works trying to
make heavy cuts, the more current the Spindle Motor
utilizes. This can be caused by a cut so large that it
exceeds the machine capability, or a problem with the
spindle motor or AC drive.
Spindle Drive parameters are not
correct
May need to re-download the Spindle Drive
parameters. Contact Customer Service for assistance.
Spindle Run Command not reaching AC
Drive
Verify Spindle Run LED is on Spindle Control Board.
3.5.2 Spindle Motor Hums or Will Not Run
If the spindle will not run, you must ensure that 110V power is reaching the spindle
motor contactors in the electrics box. Check your 110V power across terminals
wire 3 and ground. If power is not reaching the electrical cabinet but is reaching the
cable breakout box, most likely a relay has failed in the cable breakout box. The cable
breakout box will need to be replaced. This relay is in series with the 110V power in the
E-stop circuit. See Section 3.3.11. If power has reached the electrical box, use the
schematic in Section 4.8 to see how the power is routed.
If the spindle motor makes a constant humming noise during operation, check
the 3-phase power to the machine by checking line to line.
Possible Cause Check This
Wrong voltage Check the 220V/440V voltage to the machine
Poor wiring connections Check all the wiring connections to the electric’s box.
Defective cables or poor cable
connections
Check all cable connections
Spindle Motor is bad Check the resistance of the Spindle Motor windings on the Spindle
Motor between L1 & L2, L2 & L3, and L1 & L3, using an
Ohmmeter. The resistance should range from ".7 to 1.2 Ohm" for