Makino EDGE-2, Preinstallation Manual, Page: 27 / 120

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1.8 Electrical Maintenance Safety
Electrical maintenance procedures for Makino machining centers must be
performed by properly trained and technically qualified personnel. They
should adhere to these specific practices when working with the machin-
ing center:
• Always perform Lockout/Tagout before working on electrical circuits.
See
section 1.2.4
.
• Use extreme care when troubleshooting with power On.
• With the power Off, identify and discharge any power retaining
devices, such as capacitors, before starting any maintenance proce-
dure within any electrical control cabinet.
Electrical Maintenance Equipment
Use only industry standard approved electrical testing equipment.
• Volt/Ohm Meters.
• Oscilloscopes.
• Static Ground Wrist Straps.
Machine Grounding
All Makino machining centers must be properly grounded at the time of
installation.
• JIS class 3 grounding (resistance of 100 Ohms or less) is recom-
mended.
• Proper grounding requires an isolated earth ground.
• Ground the machine in accordance with local, state, and federal regu-
lations.
Machine Electrical Devices
Always replace defective electrical components, such as fuses, shunts,
overloads, etc., with components of the same capacity and rating as the
original equipment. If you are unsure of the correct electrical component
or part, refer to the machine’s electrical drawings or consult Makino.