PROCEDURE: MACHINE "RUNS AWAY"
Note: If the machine with no command moves one or more axes, possibly at high speed, this is considered a "run away". Verify there is not a FAULT INDICATOR lit on the axis drive. This can be a very dangerous condition and the following check should be done only if the spindle, cutter, tracing head, etc. is not near model, part or machine surfaces and the axes slides are well away from the machine extreme limits.
Check for type of failure, e.g. servo drive, tachometer, feedback device. With drives off. Put system in XYZ PENCIL trace.
CAT I: Select PENCIL XYZ on the COPY MODE screen.
Enter PENCIL COPY TIME OUT at 99 on the COPY SETUP screen.
Bring up AXIS POSITION screen.
CAT II: Select MANUAL XYZ on the DUPLICATOR CONTROL screen.
Enter PENCIL COPY TIME OUT at 99 on the DUPLICATOR CONTROL/DUPLICATOR SETUP screen.
Bring up DISPLAY MOTION screen and zero the axis.
NOTE: This insures it will stay in trace even while the stylus is not being held.
With hand on the EMERGENCY STOP push button, turn on the drives, if a "run away" occurs, stop drives immediately.
If a "run away" occurs turn power off, pull servo board (located in G10 position of multibus card rack) check F1 and F2 fuses located by 85 pin card edge conn, replace with ¼ A Pico fuse if blown. If F1 or F2 are not blown, the problem is either a faulty servo controller or servo controller feedback device (tachometer, resolver or encoder depending on controller) see servo controller manufacturer for further troubleshooting.
If drive did not "run away" in the previous step, grasp and hold stylus making sure your hand is not near any surfaces in case machine axis runs away.
Turn drives on and move all three axes watching AXIS POSITION DISPLAY for position updates. If "run away" axis does not update, the problem is with that axis position feedback device.
Turn drives off.