Control Panel; Grounding; External Wiring - Mitsubishi GT16 User Manual

5.2.3

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 other 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 level1 :
Pollution level2 :
Pollution level3 :
Pollution level4 :
5.2.4

Grounding

The following are applicable ground terminals. Use them in the grounded state.
Be sure to ground the GOT for ensuring the safety and complying with the EMC Directive.
Functional grounding
5.2.5

External wiring

(1) External devices
When a device with a hazardous voltage circuit is externally connected to the GOT, select a model which
complies with the Low Voltage Directive's requirements for isolation between the primary and secondary circuits.
(2) Insulation requirements
Dielectric withstand voltages are shown in the following table.
Reinforced Insulation Withstand Voltage
(Installation Category II, source : IEC664)
Rated voltage of hazardous voltage area
150 VAC or below
300 VAC or below
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.
Improves the noise resistance.
:
5.2 Requirements for Conpliance with the Low Voltage Directive
Surge withstand voltage (1.2/50 s)
2500V
4000V
1
2
3
4
5
6
7
8
5 - 6