Grounding; External Wiring - Mitsubishi Electric GOT2000 Series Hardware User Manual

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
2
3
4

Grounding

The ground terminals must be grounded in use.
Ground the GOT to ensure the safety and to comply with the EMC Directive.
The GOT has the following ground terminals.
Functional grounding

External wiring

External controllers
If an external device connected to the GOT has a hazardous voltage circuit, the interface circuit to the GOT must have a
reinforced insulation.
Reinforced insulation
The reinforced insulation indicates the insulation with the following withstand voltage.
Reinforced insulation withstand voltage (Source: Installation Category II of IEC664)
Rated voltage of hazardous voltage area
150 V AC or less
300 V AC or less
5 EMC DIRECTIVE AND LOW VOLTAGE DIRECTIVE
166
5.3 Low Voltage Directive Requirements
Description
Environment where the air is dry and nonconductive dust occurs
Environment where normally nonconductive dust occurs
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
For example, a typical factory floor
Environment where continuous conductivity may occur due to rain, snow, and others
For example, outdoor
: The functional ground terminal improves noise resistance.
Withstand surge voltage (1.2/50 µs)
2500V
4000V