Virginia Controls, LLC
MH-3000 User Manual, 1_03C10-VC
Page 12
2.3
Machine Room Wiring
Mount the controller firmly and install all required conduits before wiring the controller.
Note where duct has been provided in the controller for customer access, before deciding
where to locate conduit openings.
WARNING: Do not allow any metal shavings to get into relays or
contactors, or in or behind the electronic components, as these could
cause serious damage to personnel or the equipment.
2.3.1
Incoming Power
WARNING: THE 3 PHASE AC POWER SUPPLY TO THIS EQUIPMENT
MUST COME FROM A FUSED DISCONNECT SWITCH OR CIRCUIT
BREAKER WHICH IS SIZED IN ACCORDANCE WITH ALL APPLICABLE
NATIONAL, STATE AND LOCAL ELECTRICAL CODES, IN ORDER TO
PROVIDE THE NECESSARY BRANCH CIRCUIT PROTECTION FOR THE
CONTROLLER AND MOTOR. INCORRECT MOTOR BRANCH CIRCUIT
PROTECTION MAY CREATE A HAZARDOUS CONDITION.
Incoming AC power wiring should be done by a qualified and licensed electrician, using
the appropriate size wires for the installation. Consider the motor size and type of starter,
and also the length of wire required from the main power distribution center in determining
the proper wire size.
Proper branch circuit protection and disconnect device(s) must be provided, as required
by applicable local, state and national codes.
2.3.2
Grounding
WARNING: PROPER GROUNDING IS VITAL FOR THE SAFE
OPERATION OF YOUR SYSTEM. BRING THE GROUND WIRE TO THE
GROUND STUD THAT IS LABELED "GND" OR "G". YOU MUST CHOOSE
THE PROPER CONDUCTOR SIZE AND MINIMIZE THE RESISTANCE TO
GROUND BY USING SHORTEST POSSIBLE ROUTING. SEE NATIONAL
ELECTRICAL CODE ARTICLE 250-95, OR THE RELATED LOCAL
APPLICABLE CODE.
Proper grounding is vital for the safe operation of your system, and will also
reduce the likelihood of noise-induced problems, which could include CPU crashes,
or I/O communication errors.
•
The grounding wire should be sized per the applicable codes.
•
Connect the ground to a good building ground, such as the structural steel of the
building, or a cold water pipe.
•
Connect the ground on the controller to the stud labeled "GND" or the terminal "G",
as shown on the controller schematic.