MCD10074 Rev. 1.2, 15-Apr-10

Page 6 of 17

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FNP1500/1800 Front-Ends

& FNR-3 Power Shelf Data Sheet

Protection

Parameter

Conditions/Description

Min

Nom

Max

Unit

Input fuse

Not user accessible

25A, fast blow

Inrush current limitation

With NTCs

Output

No-load -, short circuit - and overload proof

Overvoltage protection latching

1

Tracking

Absolute for 48V models

Absolute for 12V models

115

122

59.5

16.85

V

V

Overtemperature protection

95

°C

Control

Specification is valid for input voltage, load, and temperature ranges, unless otherwise stated.

Parameter

Conditions/Description

Status Indication

LEDs: DC OK (green), AC OK (green); fan fail and overtemperature (amber)

I

Monitors alarm functions and sets parameters

PS present pin

Contact closure to logic ground ( internal pull-down resistor of 1 kΩ)

PS remote shutdown / Inhibit pin

TTL compatible signal, inhibited when open contact, high or at TTL logic “1”.

Signal referenced to logic return (LRTN)

Power supply OK (I

AC OK & DC OK & no overcurrent & no overtemperature & fans working

DC current fail (I

AC fail / Power down warning

(I

Provides a warning that the input power has failed at least 5 ms before the output falls

Open collector signal with 20 mA pull-down capability, referenced to logic return (LRTN).

AC fail will go high or open during power fail condition and will go low when input is within

the operating range.

A Power Fail warning will turn off the green AC OK LED.

DC fail / Output voltage fault

(I

Open collector signal with 20 mA pull-down capability, referenced to logic return (LRTN).

ORing FETs.

A green LED on the front panel indicates normal operation.

Temperature warning (I

I

I

Open collector signal with 20 mA pull-down capability, referenced to logic return (LRTN).

The OC-output will go low 100 ms before an overtemperature condition shuts down the

unit.

An amber LED on the front panel indicates overtemperature or fan fail.

DC voltage monitoring (I

Accuracy ± 0.45 V over setting range, temperature and load.

DC current monitoring (I

DC voltage trimming

(I

Setting accuracy over I

Fan speed control (I

Two fan speed levels automatically set depending on the internal temperature.

The fan speed can be set to full speed or automatic control.

Fan OK (I

Indicates if the fans are operating or have failed.

Synch. startup pin

Overcurrent signal which can be used for synchronous startup of units in parallel or to

recover from an overload condition. (See application note).