Low Voltage Directive Requirements; Power Supply; Control Panel - Mitsubishi Electric GOT2000 Series User Manual

5.3

Low Voltage Directive Requirements

The Low Voltage Directive requires that the equipment operating with power supply ranging from 50 V AC to 1000 V AC or
75 V DC to 1500 V DC has enough safety.
This section explains the precautions for the installation and wiring of the GOT to comply with the Low Voltage Directive.
The data described herein are produced with our best, based on the regulation requirements and standards obtained by
Mitsubishi Electric. However, the data do not guarantee that the equipment produced according to the data comply with the
above directive.
The manufacturer of the equipment must determine the method to comply with the Low Voltage Directive and conformance
to the directive.
5.3.1

Power supply

The insulation specification of the GOT is designed assuming installation category II.
Make sure to supply power to the GOT in installation category II.
The installation category indicates the withstand surge voltage generated by lightning strike. Installation category I indicates
the lowest withstand level, and installation category IV indicates the highest withstand level.
Installation category II indicates a power supply whose voltage has been reduced by two or more levels of isolation
transformers from the public power distribution.
5.3.2

Control panel

The GOT is an open type device (designed to be integrated in equipment).
Make sure to install the GOT in a control panel.
■1. Electric shock protection
To prevent a person who does not have enough knowledge of electric facilities, such as an operator, from electric
shock, take the following measures on the control panel.
(1) Locking the control panel
Lock the control panel, and allow only a person who is well educated and has enough knowledge of electric facilities
to unlock the control panel.
(2) Automatic power shutdown
Build the structure so that the power supply is shut down when the control panel is opened.
■2. Dustproof and waterproof features
The control panel also prevents dust and water.
Insufficient dustproof and waterproof protection may lower the insulation withstand voltage, resulting in an insulation
breakdown.
Since the insulation of the GOT is designed assuming pollution degree 2, use the GOT in an environment of pollution
degree 2 or less.
Pollution
degree
1 Environment where the air is dry and nonconductive dust occurs
Environment where normally nonconductive dust occurs
2 However, temporary conductivity occasionally occurs due to the accumulated dust.
For example, the inside of the control panel in a control room or in the floor at a typical factory
Environment where conductive dust occurs and conductivity may occur due to the accumulated dust
3
For example, a typical factory floor
Environment where continuous conductivity may occur due to rain, snow, and others
4
For example, outdoor
Category IV Category III
Description
Category II Category I
5.3 Low Voltage Directive Requirements
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