If the Z won't home on the SS 408, it could be for a few reasons.
Diagnose Alarm meaning: Search for code in Mitusbishi Alarms to match to Alarms on Servos in grey box on the machine
You might get AL 52.3 or AL 51.2 on the Z controller for this issue.
Possible Solutions:
1) Homing Switch is Dead
Test:
- Push Home button on WinCNC. If you see a red triangle when switch is hit (top) next to Z line then switch is working.
2) Z-Balancer Shaft is Dirty
Fix:
- Use WD-40 on a lint-free towel to wipe down and clean shaft
- Snug up any looseness in shaft with 3/8" wrench (tightens at bottom on flatten sides of shaft)
- Try to home, if successful, you're done.
3) Balancer Shaft is Too Loose or Tight
Fix: Use a 3/8" wrench to hand snug shaft. Wrench at flatten spots on shaft at bottom.