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Panel Assist WebNew Value For Control Panels

lastupdate: 2016/07/19

  • Thermal Countermeasures

The Correct Fan Must Be Selected to Prevent Failures of Devices and Parts inside the Panel Caused by Heat.

If the temperature inside the panel increases, the lives of devices and parts inside the panel will be reduced and malfunctions could result.
Particularly devices and parts that generate heat are greatly affected by heat.
Fan selection is extremely important to long-term usage of the panel, devices and parts inside the panel.

Selecting Fans

1.Check the heating values of devices and the panel (kW).

Check the heating value of each device located in the control panel and then find the total heating value.
Generally speaking, the heating value indicates the power consumption,
so you can assume that the power consumption equals the heating value.

Heating value(W) = Input power - Output power

              = (Output power / Efficiency) - Output power 

2.ΔT of devices and panel: Allowable temperature rise (°C)

ΔT can be obtained by subtracting the device ambient temperature,
T1 from the allowable internal temperature, T2.

Note: As a guideline, you can make the calculation with a value of 10°C.
(Use the more severe condition.)

3.Calculate Q, the required flow rate (m3/min).

Q = ((50 × W) / ΔT) *m3/min

4.Select the size of the required Fan based on the maximum flow rate.

Normally, select a Fan with a maximum flow rate of 1.3 to 2 times the calculated required flow rate (Q).

As the flow rate increases, noise increases.

If the Fan is used in an environment where noise is a problem, select a Fan with a lower flow rate.

5.Selecting Options

Depending on the actual situation, select a Filter or Finger Guard.

Note: Actual results may vary from calculations, so measurement and confirmation in the actual panel are required.
For details on the calculation methods or fan selection, refer to Control Panel Basics Volume 1.

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If the flow rate is insufficient, two Fans can be operated in parallel for approximately twice the flow rate.

Recommended Axial Fans


For details, refer to Control Panel Basics Volume 1 that describes the knowhow for thermal countermeasures.
PDF file Download

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