Define the Failure Boundary
The FANUC MATRA Tape Cut Model I can move the X and Y table axes in JOG mode, and both displayed coordinates change. In MEMORY mode, pressing START produces no table motion and no X/Y position change. Automatic reference return and DRY RUN also fail, while no warning or error appears.
| Test | Observed result | Diagnostic meaning |
|---|---|---|
| Manual X/Y jog | Table and coordinates move | The basic axis-motion path functions under manual control; this does not prove that every automatic-motion permission is present. |
| MEMORY start | No motion or coordinate change | Automatic execution is not reaching commanded axis movement. |
| Automatic reference return | No motion | The failure affects more than the cutting program. |
| DRY RUN in automatic mode | No motion | The fault is not limited to process conditions used only during normal cutting. |
Check the Automatic-Motion Permission Path
A missing enable from a monitored cover or waste-wire-bin switch was proposed because related FANUC wire machines use those inputs. However, this remains a hypothesis for the Tape Cut Model I. On a W2 machine, an open cover prevented cutting but still allowed DRY RUN motion; the affected machine cannot move during DRY RUN. That difference weakens a cover-only diagnosis but does not exclude an open, loose, or previously bypassed input elsewhere in the automatic enable chain.
- Record the exact switch positions and enabled process conditions used when JOG succeeds and MEMORY fails.
- De-energize the machine according to the facility safety procedure, then inspect accessible cover and waste-wire-area switches, actuators, connectors, and wiring for open circuits, loose terminations, or failed earlier modifications.
- Restore power safely and repeat MEMORY, automatic reference return, and DRY RUN tests after correcting any verified wiring defect.
- If all three automatic tests still fail, trace the automatic START and motion-enable conditions with the machine electrical documentation or qualified FANUC service support. The absence of an alarm does not identify which condition is missing.
Do Not Copy Parameters from Other Models
Values P0023: 10000000 and P0024: 01000010 were taken from different machines identified as W2 and T3, and their meanings were unknown. They are not validated settings for the Tape Cut Model I. Do not enter them as a troubleshooting experiment: an undocumented parameter change can introduce another fault while obscuring the original one.
Before changing any parameter, obtain a verified parameter definition and a backup of the installed values. Compare settings only against documentation or a known-good record for the same machine configuration.
Verification Criteria
Confirm recovery by demonstrating all affected functions: start a known program in MEMORY mode, verify X/Y position changes during commanded motion, run the documented DRY RUN function, and complete automatic reference return. Manual JOG operation alone is insufficient because it was already functional during the failure.
FAQ
Why does a FANUC EDM table jog manually but not move in MEMORY mode?
The evidence points to a condition specific to automatic execution, such as a missing START or motion-enable permission. Successful X/Y jogging narrows the fault but does not prove that the automatic permission chain is complete.
Can a cover switch stop automatic motion without displaying an alarm?
A cover or waste-wire-bin switch is a supported diagnostic hypothesis because related machines monitor those devices. On the affected machine, DRY RUN also fails, so inspect the switch circuit but do not assume it is the sole cause.
Should I enter P0023 and P0024 values from a FANUC W2 or T3?
No. The proposed values P0023: 10000000 and P0024: 01000010 came from different models, and their functions were not identified; change parameters only with model-specific definitions and a verified backup.