8

ABC400 Series

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7. PROTECTION

PARAMETER

CONDITIONS / DESCRIPTION

MIN

NOM

MAX

UNIT

F

Input Fuses (L only)

Not user accessible, time lag characteristic

8.0

A

Vo ov

OV Threshold

ABC400-1012G

14.0

16.0

VDC

ABC400-1024G

28.0

32.0

VDC

ABC400-1048G

53

57

VDC

Current Limit

ABC400-1012G

31.5

33.0

39.0

A

ABC400-1024G

20.0

21.0

23.0

A

ABC400-1048G

8.9

10

11.1

A

Over Temperature on Heat Sinks

Automatic shut-down

100

°C

7.1 OVERVOLTAGE PROTECTION

The AC-DC power supply provides a fixed threshold overvoltage (OV) protection implemented with a HW comparator. Once an OV

condition has been triggered, the supply will shut down and latch the fault condition. the latch can be unlocked by disconnec ting the

supply from the AC mains only.

7.2 CURRENT LIMITATION

The main output current limitation will decrease with linear derating to 50% at 70 ºC if the ambient (inlet) temperature increases beyond

50 °C (see

Figure 15: Output Current Limitation Curve

7.3 POWER GOOD SIGNAL

The Out-OK output gives a status indication of the converter and the output voltages. It can be used for control functions such as da ta

protection, central system monitoring or as a part of a self-testing system. Connecting the Out-OK as shown in

indicates that the output voltage(s) of the converter are within the range.

Note: using the potentiometer, the monitor level tracks the programmed output voltage. In an error condition, if the output voltage is

out of range due to overload or an external overvoltage, Vok will approach Vp. The output is formed by an NPN transistor. The signal

is isolated from the output.

0

20

40

60

80

100

120

-10

0

10

20

30

40

50

60

70

Ambient Temperature(°C)

Series1