Справочник Пользователя для Mitsubishi Electronics C6/C64

 

I - 11 

Please refer to the following procedures for heat radiation countermeasures. 

 

(1) Average temperature in cabinet  : T     

≤

  55C° 

(2) Cabinet peripheral temperature 

: Ta   

≤

  0C° to 45C° 

(3) Internal temperature rise value 

: 

∆

T  

=

  T  -  Ta(max)  

=

  10 C° 

 
Procedures for heat design   
and verification

 

  (1) Refer to section "3.1 General Specification" for the heat

generated by each unit. 

  (2) Enclosed cabinet (thin steel plate) cooling capacity (W1)

calculation equation 

            W1   

=

  U x A x 

∆

T 

                      U: 

6W/m

2

 

×

 C° 

---with internal circulation fan 

                                 

4W/m

2 

×

 C° 

---without internal circulation fan 

           A: 

Effective heat radiation area (m

2

) 

                   

∆

T: 

Internal temperature rise value (10C°) 

(Area where heat can be radiated from

cabinet) 

When calculating the effective heat radiation area, do not

include the parts that contact other objects.   

 (3) Points of caution for heat radiation countermeasures

when designing mounting state 

* Consider convection in cabinet (eliminate heat spots) 

* Collect hot air at suction port in heat exchanger cabinet.

  (4) Criterion for internal temperature rise distribution data 

∆

T (average value) 

≤

 10C° 

∆

Tmax (maximum value) 

≤

 15C° 

R (inconsistency 

∆

Tmax – 

∆

Tmin) 

≤

 6C° 

(Evaluate existence of heat spots)

 

Comparison between   

W and W1 

Calculate total heat generated by 

each mounted unit (W)

 

Calculate cabinet’s cooling capacity 

(W1) 

Selection of heat exchanger 

Mounting design 

Collection of internal temperature 

rise distribution data 

Evaluation 

Improvements  

Completion 

W 

≤ W1 

W > W1 

∆

T 

≤ 

10C° 

∆

T 

> 

10C° 

 

 

Refer to section "3.1 General Specification" for the heat generated by each unit. 
If heat accumulates at the top of the control unit, install a circulation fan in the operation box. 

If the following conditions are not satisfied, install a circulation fan in the cabinet. 

Criterion for internal temperature rise distribution data 
∆T (average value) ≤ 10°C 
∆Tmax (maximum value) ≤ 15°C