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(b) DC solenoid valves, magnet switches and relays
Measure: Install a diode in parallel with the coil. Determine the diode capacity in accordance with the
load capacity.
In a DC circuit, connecting a diode in reverse polarity will damage
the diode, internal parts of the controller and/or DC power supply,
so exercise due caution.
3.4 Heat Radiation and Installation
Design the control panel size, controller layout and cooling method in such a way that the temperature
around the controller will not exceed 40°C.
Install the controller vertically on a wall, as shown below. Since cooling is provided by way of natural
convection, always observe this installation direction and provide a minimum clearance of 50 mm above
and below the controller to ensure sufficient natural airflows.
When installing multiple controllers side by side, providing a ventilation fan or fans above the controllers
will help maintain a uniform temperature around the controllers.
Keep the front panel of the controller away from the wall (enclosure) by at least 95 mm.
Regardless of whether your system consists of a single controller or multiple controllers, provide sufficient
clearances around each controller so that it can be installed/removed easily.
Fan
50 mm or more
50 mm or more
Airflow
95 mm
or more
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