Appendix 8.2.5 External Wiring - Mitsubishi Electric Q26UD(E)HCPU User Manual

(2) Dustproof and waterproof features
The control panel 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 programmable controller is designed to cope with the pollution level 2, so use in an
environment with pollution level 2 or below.
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 to IP54 in 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.
As shown above, the programmable controller can realize the pollution level 2 when stored in a control panel
equivalent to IP54.
Appendix 8.2.5
(1) Module power supply and external power supply
For the remote module which requires 24VDC as module power supply, the 5/12/24/48VDC I/O module, and the
intelligent function module (special function module) which requires the external power supply, use the
5/12/24/48VDC circuit which is doubly insulated from the hazardous voltage circuit or use the power supply
whose insulation is reinforced.
(2) External devices
When a device with a hazardous voltage circuit is externally connected to the programmable controller, use a
model whose circuit section of the interface to the programmable controller is intensively insulated from the
hazardous voltage circuit.
(3) Reinforced insulation
Reinforced insulation means an insulation having the following withstand voltage.
Rated voltage of hazardous voltage area
150VAC or lower
300VAC or lower
External wiring
APPENDICES
Surge withstand voltage
(1.2/50µs)
2500V
4000V
A
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