Справочник Пользователя для Mitsubishi Electronics A171SHCPUN

2. DESIGN

2 

−

 21

(4) Average power consumption from voltage drop in output circuits of the output

modules (power consumption of simultaneously ON points)

W

OUT

 

=

 I

OUT

Vdrop No. output points Simultaneously ON ratio (W)

I

OUT

 : 

I

OUT

 is the output current(actual operation current) (A)

Vdrop: Vdrop is the voltage drop of each output module (V)

(5) Average power consumption from voltage drop in input circuits of the input

modules (power consumption of simultaneously ON points)

W

IN

 

=

I

IN

E No. input points Simultaneously ON ratio (W)

I

IN

 : 

I

IN

 is the input current (effective value for AC) (A)

E 

: E is the input voltage (actual operation voltage) (V)

(6) Power consumption of special-function module power supply circuits

W

S

 = I

5V

5 + I

24V

24 I

100

v 100(W)

The total power consumption of each block described above is the power
consumption of the entire PC system.

W = W

PW

 + W

5V

 + W

24V

 + W

OUT

 + W

IN

 + W

S

 (W)

Use the overall calculated power consumption (W) to calculate the heat
generation and temperature rise inside the enclosure.
The following equation approximately calculates the temperature rise in the
enclosure:

T =     ( C)

W

UA

W  : W is the overall power consumption of the motion controller (calculated

above)

A 

: internal surface area of the enclosure (m

2

)

U 

: if a fan is used to make enclosure temperature uniform ............6

if air is not circulated inside the enclosure ..................................4

 CAUTION

If the enclosure temperature rises above the prescribed range, a heat exchanger should be
attached to the enclosure to lower the temperature.
Ventilation of the enclosure with a fan can result in dust problems with the motion controller
because of the dust which is introduced with the ambient air.