Chapter 2
23
UM10350_PCNC770_Manual_0916A
Site Planning and Prep
2.2.3 Ground Fault Interrupter (GFI) Use
Primary power for PCNC mills should not be protected by a ground fault interrupter (GFI), as this
interferes with the proper operaon of the PCNC mill’s Variable Frequency Drive (VFD) spindle
controller. A ground fault interrupter (GFI) is recommended for the secondary power supply to the
PCNC 1100; PCNC 770 does not have a secondary power supply.
2.2.4 Electrical Noise
Both primary and secondary power should be provided by dedicated circuits. At the minimum,
circuits should be isolated from electrically-noisy devices. In parcular, high-inducve loads from
vacuum cleaners, air compressors, etc., can be troublesome and the source of controller malfuncon.
At sites where this is not possible, a dual-conversion power supply should be considered for
115 VAC circuits.
2.2.5 Options for Electrically Non-conforming Sites
The following opons can be considered for sites that do not conform to the electrical requirements
detailed in this secon. Consult with an electrician to determine suitability for the specic site.
2.2.5.1 Buck-Boost Transformer
While the PCNC 1100 will run on line voltages between 200-250 VAC, best performance is achieved
with a minimum of 230 VAC. A Buck-Boost Transformer (PN 32554) is recommended for minor
adjustments of stable line voltages below 230 VAC to ensure no reducon in spindle performance.
2.2.5.2 Step-up/Step-down Transformer
If needed, a Step-Up/Step-Down Transformer (PN 32009) can be used to reduce 230 VAC line voltage
to 115 VAC, as required by the PCNC 770. This device is commonly used for PCNC 770 mills located
outside of the USA and Canada.
2.2.5.3 Quick 220
™
Voltage Converter Power Supply
A Quick 220™ voltage converter can be used to convert voltages from two out-of-phase 115 VAC
circuits to a single 230 VAC output. This opon may be of interest to PCNC 1100 owners with sites
that do not allow for 230 VAC service (PN 33972).
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