DEC 12, 2006 revised to FEB 22, 2007

Page 6 of 15

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FNP1500/1800 and FXP1500/1800 Front-Ends

& FNR-3 and FXR-3 Power Shelves 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

115

122

59.5

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

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

mA pull-down capability, referenced to logic return (LRTN). DC fail will go high or open if

ok, but the unit is disabled.

Temperature warning (I

I

I

shutdown. Open collector signal with 20 mA pull-down capability, referenced

to logic return (LRTN). The OC-output will go low 100 ms before an over-

temperature 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).

For detailed Information on I

document.