Acer AT2605 User Manual download pdf (Page 34)

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Operating conditions

Body of TU1 (DA0VWETH2C3 REV:C)

13.2 12.9

Body of U1 (DA0AD6TB4B3 REV:B)

10.2 9.6

Inside enclosure near power

8.2 7.4

Outside enclosure near power

7.8 5.8

Panel surface

24.9 25.0

Button

2.0 1.8

Ambient (ºC)

24.1 23.6

Winding temperature rise measurements

Ambient temperature t1 (

C) .................................. :

-- —

Ambient temperature t2 (

C) .................................. :

—

Temperature rise ∆T of winding: R

(Ω) R

(Ω) ∆T (K) Limit ∆T (K)

Insulation

class

Comments:

The temperatures were measured under worst case normal mode defined in 4.2.1

For winding wires note 4 and for thermoplastics note 6 have been considered in accordance with IEC 60085.

The maximum ambient temperature is defined as 40°C.

Winding components:

- Polyurethane resin insulation

→

∆

Tmax = 85 K - 10 K - (40-35) K = 70 K

Components with:

- max. absolute temp. of 130°C

→

∆

Tmax = (130-40) K = 90 K

- max. absolute temp. of 120°C

→

∆

Tmax = (120-40) K = 80 K

- max. absolute temp. of 105°C

→

∆

Tmax = (105-40) K = 65 K

- max. absolute temp. of 100°C

→

∆

Tmax = (100-40) K = 60 K

- max. absolute temp. of 70°C

→

∆

Tmax = (70-40) K = 30 K

User touchable surface with:

- plastic part

→

60K-(40-35) K = 55 K

7.2 TABLE: softening temperature of thermoplastics

Temperature T of part T - normal condi-

tions (

T - fault condi-

tions (

T softening

(

9.1.1 TABLE: Electric shock hazard under normal condition

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 53 54

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