Control Panel - Mitsubishi Electric MELCEC Q Series User Manual

8. EMC AND LOW VOLTAGE DIRECTIVES
8.2.4

Control panel

Because the programmable controller is an open type device (a device designed to be
stored within another device), be sure to use it inside the control panel.
(1)
(2)
* Also, each network remote station needs to be installed inside the control panel. However, the
waterproof type remote station can be installed outside the control panel.
Shock protection
To prevent personnel such as operators who are not familiar with electricity from
electric shocks, the control panel must be handled as follows:
(a) Lock the control panel so that only the qualified personnel can open it.
(b) Provide a mechanism so that opening the control panel will automatically stop
the power supply.
(c) For electric shock protection, use IP20 or greater control panel.
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. As our programmable controllers are designed assuming the
pollution level 2, use them in an environment of pollution level 2 or lower.
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,
however, temporary conductivity may occasionally occur due to
accumulated dust. Generally, this is the level for the inside of the
IP54-equivalent control panel in a control room or on a shop
floor.
Pollution level 3: An environment where conductive dust exists 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 meet pollution level 2 when stored
in a control panel equivalent to IP54.
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