The device labeled AUTO POWER OFF / ON on a Mazak electrical cabinet is an optional timer. It schedules automatic machine power-on and power-off at configured times; the available evidence does not show that it shuts the machine down immediately when the machining program ends.
Identify the Installed Option
This timer is optional and is not installed on every Mazak machine. Confirm that the controls are part of the automatic power option before changing them. A machine without this option cannot gain automatic shutdown merely through a program-end command described in the available evidence.
| Observed label | Evidence-supported interpretation | Engineering decision |
|---|---|---|
| AUTO POWER ON | Timer function for scheduled automatic power-on | Use only after confirming the required start schedule |
| AUTO POWER OFF | Timer function for scheduled automatic power-off | Do not treat it as a confirmed program-end shutdown control |
| VALID / INVALID | Enable or disable state for the associated function | Verify which labeled function each selector controls |
| WARM-UP PROGRAM | A labeled control is present, but its operation is not established by the evidence | Consult the machine-specific documentation before changing it |
| BREAKER TRIP | A labeled control is present, but its operation is not established by the evidence | Do not use it to test automatic shutdown |
Interpret VALID and INVALID Correctly
If AUTO POWER OFF is set to INVALID, the scheduled power-off function is disabled. If AUTO POWER ON is set to VALID, the scheduled power-on function is enabled. This combination therefore indicates enabled automatic starting and disabled automatic stopping, assuming each selector is aligned with the adjacent label.
These states alone do not define the operating times. The timer schedule must also be configured, and the evidence provides no button sequence, menu path, or timer values. Do not guess those settings.
Configure and Verify the Shutdown Function
- Confirm that the cabinet device is the optional Mazak AUTO POWER OFF / ON timer and identify which selector belongs to each function.
- Obtain the documentation for the installed timer or the specific machine. Use it to configure the required power-off time; no universal sequence is established by the evidence.
- Set AUTO POWER OFF to VALID only after confirming the schedule and ensuring an automatic shutdown will not interrupt machining or another required machine state.
- Run a controlled test with no production operation dependent on continued power. Verify that shutdown follows the configured time rather than assuming it will follow program completion.
Program-End Shutdown Versus Timed Shutdown
The documented distinction is critical: the optional device is described as a timer that powers the machine on and off at specified times. The evidence does not establish a direct relationship between the CNC program-end event and this timer. If the requirement is “shut down immediately after the last part,” verify that capability in the machine-specific Mazak documentation instead of treating AUTO POWER OFF as confirmation of program-linked behavior.
FAQ
Does Mazak AUTO POWER OFF shut down the machine when the program ends?
Not according to the available evidence. The optional AUTO POWER OFF / ON device is a timer for scheduled power control; program-end-triggered shutdown is not established.
What does AUTO POWER OFF INVALID mean on a Mazak?
It means the scheduled automatic power-off function is disabled. Change it to VALID only after confirming the timer schedule and the machine-specific operating procedure.
What does AUTO POWER ON VALID mean on a Mazak?
It indicates that scheduled automatic power-on is enabled. The actual start time depends on the timer configuration, which must be checked in the documentation for the installed option.
