VM Series Maintenance and Safety Manual 704-0212-209 Machine Components 1- 15
Machine Electrical Cabinet
The electrical cabinet contains power circuitry and CNC electronics. The cabinet is
attached to the machine column and connects to the machine systems via cable and
harness assemblies. Power-related circuitry distributes power, while CNC-related
electronics control machine operation (e.g., spindle speed and axis positioning).
The electrical control cabinet located at the back of the machine contains CNC-related
electronics and power-related circuitry.
Safety Procedures for Electrical Service
Before removing or working on any printed circuit board (PCB), cables, fuses, breakers,
or other machine components, make sure that the main disconnect switch on the
electrical cabinet door is in the off position. Whenever work will be performed in an area
away from the main disconnect switch, post a warning at the switch informing others that
the machine is being serviced and the power must remain off.
Handling Printed Circuit Boards
The following procedures should be taken to prevent damage when removing PCBs, or
when checking the boards for proper and secure connections.
Avoid flexing the PCBs. Rough handling can result in hairline cracks in the printed circuit
etching. Problems caused by cracks in PC boards can be hard to isolate. Avoid touching
the components on a PCB because they can be damaged by static electricity.
• Always put on a static-safe handling wrist strap before touching PCB
assemblies inside the cabinets, and before removing replacement boards
from their static protective packaging.
• Visually inspect the wrist strap every time you put it on, making sure that
the snap fasteners are properly connected.
• Be sure the strap fits snug to the wrist. Taking off the wrist strap should
be the last
thing done when finished inside the cabinet.
• After the replacement PCB is properly mounted, place the defective PCB
assembly into the static shielding and return it to Hurco.
An industrial UPS (Uninterruptible Power Supply) kit is available as
an option. The UPS contains a battery that can power the machine
for an extended amount of time in the case of a power outage.
Please contact Hurco or your Hurco Distributor for details.
High voltages inside the electrical cabinet can cause serious injury or
death. Only qualified personnel may service the machine, and must
follow all safety rules and precautions. The line-side of the main
disconnect switch is hot, unless the AC source is disconnected.
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