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BCD.00002 Rev AJ, 28-May-2018

Page 13 of 17

IMX70 / IMY70 Series

70 to 90 Watt DC-DC Converters

© 2018 Bel Power Solutions & Protection

Immunity to Environmental Conditions

Table 11: Mechanical and climatic stress

Test method

Standard

Test Conditions

Status

Cab Damp heat

steady state

IEC/EN 60068-2-78

MIL-STD-810D section 507.2

Temperature:

Converter

not operating

Relative humidity:

Duration:

56 days

Db

Damp heat test,

cyclic

EN 50155:2007, clause 12.2.5

IEC/EN 60068-2-30

Temperature:

55 °C and 25 °C

Converter

not operating

Cycles (respiration effect):

2

Duration:

2 x 24 h

Bd

Dry heat test

steady state

EN 50155:2007, clause 12.2.4

IEC/EN 60068-2-2

Temperature:

70 °C

Converter

operating

Duration:

6 h

Ad

Cooling test

steady state

EN 50155:2007, clause 12.2.3

IEC/EN 60068-2-1

Temperature, duration:

-40 °C, 2 h

Converter

not operating

Performance test:

+25 °C

Ka

Salt mist test

sodium chloride

EN 50155:2007, clause 12.2.10

IEC/EN 60068-2-11

class ST2

Temperature:

Converter

not operating

Duration:

16 h

Fc

Vibration

(sinusoidal)

IEC/EN 60068-2-6

MIL-STD-810D section 514.3

Acceleration amplitude:

0.35 mm (10 – 60 Hz)

5 g

2

(60 - 2000 Hz) Converter

operating

Frequency (1 Oct/min):

10 – 2000 Hz

Test duration:

7.5 h (2.5 h in each axis)

Fh

Random vibration

broad band (digital

control) & guidance

IEC/EN 60068-2-64

Acceleration spectral density: 0.05 g

n

2

/Hz

Converter

operating

Frequency band:

8 – 500 Hz

Acceleration magnitude:

4.9 g

n rms

Test duration:

1.5 h (5 h in each axis)

Ea

Shock

(half-sinusoidal)

IEC/EN 60068-2-27

MIL-STD-810D section 516.3

Acceleration amplitude:

50 g

2

Converter

operating

Bump duration:

11 ms

Number of bumps:

18 (3 in each direction)

---

Shock

EN 50155:2007, clause 12.2.11

EN 61373 sect. 10

Acceleration amplitude:

5.1 g

n

Converter

operating

Bump duration:

30 ms

Number of bumps:

18 (3 in each direction)

---

Simulated long life

testing at increased

random vibration

levels

EN 50155:2007, clause 12.2.11

EN 61373 sect. 8 and 9

Acceleration spectral density: 0.02 g

n

2

/Hz

Converter

operating

Frequency band:

5 – 150 Hz

Acceleration magnitude:

0.8 g

n rms

Test duration:

15 h (5 h in each axis)

1

Body mounted = chassis of a railway coach

2

Models with option Z have been covered by lacquer (AVR80 or Peters SL1301) in order to simulate the end-use situation.

Temperatures

Table 8: Temperature specifications, valid for an air pressure of 800 – 1200 hPa (800 – 1200 mbar)

Model

-0

Unit

Characteristics

Conditions

min

typ

max

T

A

Ambient temperature

- 40

°C

T

C

- 40

T

C Z

- 40

T

S

Storage temperature

Not operational

- 55

85

1

See Thermal Considerations

2

Temperature measurement point; see Mechanical Data