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Panel Cooling Units

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Method for selecting peripheral devices

Selection of breaker and transformer

●Selection of breaker

Refer to the following table for criteria for selecting capacity of breaker.

Power supply Application breaker capacity (Unit: A)

Single phase100V

Single phase 200V

3-phase 200V

More than consumed current (MAX value) of control panel cooler for

● Selection of transformer

In case of using FA cooler from 400V power supply, refer to the following table for criteria for selecting capacity of transformer.

Power supply Method for determining capacity of transformer (Unit: VA)
Single phase 100V 100V×starting current of this control panel cooler (A)
Single phase 200V 200V×starting current of this control panel cooler (A)
3-phase 200V 200V×starting current of this control panel cooler (A) × √3

Note : √3=1.732

 

Here, following calculation method is also used for avoiding using transformer with higher capacity than required.

 

<Transformer capacity by rated current>

・In case of 3 - phase 200V,

Rated voltage (V) x rated current (MAX)(A) × √3...(1)

 

<Transformer capacity when taking usable capacity as 3 times (value from experience) against instantaneous overload >

Transformer capacity at the abovementioned starting current(VA) ÷ 3...(2)

(1) and (2) are compared and higher numerical value is selected.

 

Note) In case of this calculation, lowering in voltage at instantaneous 3 times overload is taken as about 5~10%. The abovementioned calculation may not be applicable as per usage condition.

Moreover, it is generally recommended to calculate transformer capacity from starting current and hence, numerical values calculated from abovementioned (1) and (2) do not guarantee its compliance.

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