Hurco VM Series Maintenance And Safety Manual page 49

Electrical Service Requirements
Follow all requirements below to help ensure personnel safety and to prevent equipment
damage.
Run electrical power to the machine location, with adequate length to reach the
connections in the power cabinet. Final connections MUST be supervised by a Hurco-
certified Service Engineer.
Connecting Electrical Service
Observe the following guidelines when connecting electrical service:
• On-site wiring must comply with all established directives and standards.
• Dedicated, grounded 3-phase AC power is required to prevent high and/or
low voltages, spikes, surges, and high frequency noise caused by inductive
loads.
• The AC power source must match the voltage specifications listed on the
machine data plate.
• Failure to provide the required power parameters may affect machine safety,
performance and warranty.
• Wiring to the machine must be capable of supplying continuous, full-load
specified amperage.
Recommended Isolation Transformer Configuration
If a transformer other than the one provided with the machine is used, it must meet
Hurco's machine operating voltage requirements. Use a Delta to balanced Wye
configuration. Refer to the Getting Started manual for more information.
Grounding Equipment
The machine electrical and electronic control systems are interconnected, terminating at
the Protective Earth (PE) or ground point.
• The ground point must be properly connected to the ground circuit of the AC
power source. The ground point is located inside of the machine's power
cabinet.
• The ground point provides only one conducting path between the machine
and external ground, preventing an unwanted ground loop (ground
differential voltage).
VM Series Maintenance and Safety Manual
704-0212-209 Operation Requirements 2- 3