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1.2.3 Control panel
Because the GOT is open type equipment (device designed to be stored
within another device), be sure to use it only when installed in a control panel.
1) Shock protection
In order to prevent those who are unfamiliar with power facility, e.g., an
operator, from getting a shock, make sure to take the following measures
on the control panel.
a) Store the GOT within the control panel locked, and allow only those
who are familiar with power facility to unlock the panel.
b) Build the structure in order that the power supply will be shut off when
the control panel is opened.
2) Dustproof and waterproof features
The control panel also provides protection from dust, water and ether
substances. Insufficient ingression protection may lower the insulation
withstand voltage, resulting in insulation destruction. The insulation in the
GOT is designed to cope with the pollution level 2, so use in an
environment with pollustion level 2 or better.
Pollution level 1 :
Pollution level 2 :
Pollution level 3 :
Pollution level 4 :
1.2.4 Grounding
There are two kinds of grounding terminals as shown below. Both terminals
must be grounded.
Be sure to ground the grounding for the safety reasons and EMC Directives.
Protective grounding
Functional grounding
An environment where the air is dry and conductive
dust does not exist.
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 panel
equivalent a control room or on the floor of a typical
factory.
An environment where conductive dust exits and
conductivity may be generated due to the
accumulated dust.
An environment for a typical factory floor.
Continuous conductivity may occur due to rain, snow,
etc. An outdoor environment.
: Maintains the safety of the GOT and improves
the noise resistance.
: Improves the noise resistance.
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