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8.1 Requirements for conformance to EMC Directive
8.1.3 Grounding
8 - 4
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
PERFORMANCE
4
NAMES OF
THE PARTS AND
THEIR SETTINGS
5
ROUGH
PRE-OPERATION
PROCEDURE
6
HANDLING
7
MAINTENANCE AND
INSPECTION
8
EMC DIRECTIVE
(3) Electrical shock prevention
In order to such as the operators from electric shocks, the control box must have the following
functions :
(a) The control cabinet must be equipped with a lock so that only skilled or qualified personnel.
(b) The control cabinet must be fitted with advice which automatically stops the power supply
when the cabinet is opened.
(4) Dustproof and waterproof features
The control box also has the dustproof and waterproof functions. Insufficient dustproof and
waterproof features lower the insulation withstand voltage, resulting in insulation destruction. The
insulation in our GOT is designed to cope with the pollution level 2, so use in an environment with
pollution level 2 or better.
8.1.3 Grounding
It is necessary to use the GOT grounding terminal only when it is in the grounded condition.
Be sure to ground the grounding for the safety reasons and EMC Directives.
Functional grounding : Improves the noise resistance.
Pollution level 1: An environment where the air is dry and conductive dust does not exist.
Pollution level 2: An environment where conductive dust does not usually exist, but occasional
temporary conductivity occurs due to the accumulated dust.
Generally, this is the level for inside the control box equivalent a control room
or on the floor of a typical factory.
Pollution level 3: An environment where conductive dust exits and conductivity may be
generated due to the accumulated dust.
An environment for a typical factory floor.
Pollution level 4 : Continuous conductivity may occur due to rain, snow, etc.
An outdoor environment.