Specifications

Southwestern Industries, Inc.
ProtoTRAK

SMX K2, K3, K4 & Retrofit Safety, Installation, Maintenance, Service & Parts List Manual
44
• Code 11 Measure's the backlash in the system. Only used on machines with Dual
Feedback systems.
• Code 12 Feed Forward Constant. High feed forward constants will cause an
unstable servo system.
• Code 127 Measure's the backlash in the system. Only used on machines with no Dual
Feedback.
• Code 128 Enter backlash compensation.
• Code 123 Calibrate.
Possible Cause Check This
Too much backlash entered in Code 128
or Code 11.
Recheck the machines backlash.
Inadequate or no Lubrication to
Ballscrews and Way surfaces
Make sure all the Way surfaces are getting proper
lubrication. If not, check to make sure that the lube pump
is functioning properly. Also check for any pinched or
blocked oil lines. See Lubrication section
X and Y Gibs are not adjusted properly
Check the adjustment of the X and Y Gibs using the X
and Y Gib adjustment procedures.
Gibs not making good contact. Pull gibs out and mark with a blue die to check where the
gibs are making contact. It is recommended that the gibs
uniformly contact at least 80% of the surface.
Binding or looseness in the Drive Train Check Repeatability using the Repeatability and Positional
Accuracy procedure. Check the torque reading of the
Drive Train. Step by step, carefully inspect the Drive Train
for any binding or looseness. It may be necessary to
disassemble and then reassemble the Drive Train. See
Mechanical Drive Train (X, Y) Section 4.2
Axis Motor belt too tight. Loosen belt.
Misalignment of ball screw
See Mechanical Drive Train (X, Y) Section 4.2
3.2.6 Searching Axis
The handwheels are slowly turning back and forth when the servos are engaged. Several
thousandths of motion are observed on the vernier dial and the frequency is one cycle
every couple of seconds.
Do the following Service Code and procedures:
• Code 11 Measures backlash in system. (Used only with glass scales and sensors.)
• Code 12 Sets a feed forward power constant to drive axis motors.
• Code 128 Backlash compensation on single feedback machines.
Possible Cause Check This
Most often causes by excess backlash
compensation
Use code 127. Check physical backlash in system and
re-enter in code 128. Run code 11 on dual feedback
machines
High feed forward values
Check ball screw torque. Typical values should be
between 10 to 15 in-lbs.
Excessive friction in the sliding ways
Lubrication, gib adjustments, gib locks.
See Machine Tool & Setup - Section 4.1
Looseness in the drive train
Especially the tightness of the drive assembly.
See Mechanical Drive Train (X, Y) - Section 4.2