Pre-Installation Manual for i-Series Machines v387 Site Preparation 1-7
Recommended Isolation Transformer Configuration
Ensure transformer requirements are met.
If a transformer is required and the machine was not equipped with one, the customer is
responsible for providing a transformer. The transformer must meet Hurco machine-
operating voltage requirements. Hurco recommends the Wye configuration (4) on the
transformer secondary that feeds power to the machine. It is the customer’s
responsibility to have a qualified electrician connect the transformer to the power source.
Figure 1–3. Wye Transformer Configuration
Figure 1–4. Delta Transformer Configuration
Grounding Equipment
Ensure proper grounding of machine.
The electrical and electronic control systems of the machining center are interconnected
internally and terminate at a single point ground (SPG) terminal. The SPG provides only
one conducting path between the machine and external ground, preventing an unwanted
ground loop (ground differential voltage). The SPG is located inside the machine power
cabinet.
The SPG must be properly connected to the ground circuit of the AC power source.
The grounding conductor must be sized to conform to all applicable electrical codes.
However, Hurco recommends that the size of the neutral conductor (when applicable) be
at least the size of the phase (current carrying) conductors.
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