Three numbers.
One compatible system.
Separate voltage, frequency and phase before evaluating a relocated, imported, used or newly purchased machine tool.
Voltage, frequency and phase are separate compatibility checks.
A voltage number alone cannot approve an installation. Capture the complete facility supply and the complete delivered-machine requirement.
| Field | Facility question | Machine question |
|---|---|---|
| Voltage | What is the measured nominal service and allowable operating range? | What line voltage or voltage range is stated for this configuration? |
| Phase | Single-phase or three-phase? What system topology and grounding apply? | What phase count does the entire machine require? |
| Frequency | 50 Hz, 60 Hz or another supply? | Is the machine and every auxiliary approved for that frequency? |
| Line relationships | What are line-to-line and line-to-neutral voltages? | Which voltage does the machine's documentation specify? |
Verify every auxiliary load.
- Main disconnect and internal transformer configuration
- Spindle and axis drives
- Coolant pumps, chip conveyors and mist collectors
- Chillers, hydraulic units and cabinet cooling
- Control power, receptacles and third-party accessories
- Grounding, bonding and electromagnetic compatibility
A mismatch can damage equipment.
The DOE motor sourcebook warns that motor voltage must match rated system supply and that mismatch can cause severe operating problems or immediate failure. Treat the OEM data and qualified review as controlling.
This reference explains terms and arithmetic. It does not size conductors, overcurrent protection, transformers, disconnects, grounding, arc-flash protection or a branch circuit. Use the exact machine documentation, the authority having jurisdiction and qualified electrical professionals. Servicing also requires an applicable hazardous-energy control program.