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
With NTCs
Inrush current limitation
Output
No-load -, short circuit - and overload proof
Tracking
Absolute for 48V models
Absolute for 12V models
115
122
59.5
16.85
% Vo nom
Overvoltage protection latching1
V
V
Overtemperature protection
Automatic power shutdown at TC
95
°C
1 Remove input voltage to reset.
Control
Specification is valid for input voltage, load, and temperature ranges, unless otherwise stated.
Parameter
Conditions/Description
LEDs: DC OK (green), AC OK (green); fan fail and overtemperature (amber)
Monitors alarm functions and sets parameters
Status Indication
I2C digital bus
PS present pin
Contact closure to logic ground ( internal pull-down resistor of 1 kΩ)
TTL compatible signal, inhibited when open contact, high or at TTL logic “1”.
Signal referenced to logic return (LRTN)
PS remote shutdown / Inhibit pin
Power supply OK (I2C)1
DC current fail (I2C)1
AC OK & DC OK & no overcurrent & no overtemperature & fans working
Overcurrent on Io1
Provides a warning that the input power has failed at least 5 ms before the output falls
out of regulation (<90% Vo1 set).
AC fail / Power down warning
(I2C & OC)2
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.
Internal undervoltage and overvoltage supervision of Vo1.
Open collector signal with 20 mA pull-down capability, referenced to logic return (LRTN).
DC fail will go high or open if Vo1 is < 90% or > 110% of Vo1 set, measured in front of the
ORing FETs.
DC fail / Output voltage fault
(I2C & OC)2
A green LED on the front panel indicates normal operation.
The LED will flash if in parallel operation Vo1 is OK, but the unit is disabled.
I2C critical temperature warning: Indicates that the operating temperature has reached
[Tshut-down – 10K]
I2C & OC overtemperature warning: Indicates if the unit is in overtemperature 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 overtemperature condition shuts down the
unit.
Temperature warning (I2C & OC)2
An amber LED on the front panel indicates overtemperature or fan fail.
Monitors the voltage Vo1 at the output connector.
Accuracy ± 0.45 V over setting range, temperature and load.
DC voltage monitoring (I2C)1
DC current monitoring (I2C)1
Monitors the output current Io1 : Accuracy ± 0.4A over the load range.
Output voltage trimming Vo1: ± 8 % of Vo set
DC voltage trimming
Setting accuracy over I2C: ± 50mV at Vo nom, ± 150 mV over setting range
(I2C or external resistor)1
Two fan speed levels automatically set depending on the internal temperature.
The fan speed can be set to full speed or automatic control.
Fan speed control (I2C)1
Fan OK (I2C & OC)2
Synch. startup pin
Indicates if the fans are operating or have failed.
Overcurrent signal which can be used for synchronous startup of units in parallel or to
recover from an overload condition. (See application note).
1 Detailed I2C information is available from the model’s I2C Manual found on the Power-One web site.
2 Provided over the I2C interface and as an open collector signal on the output connector (OC).
MCD10074 Rev. 1.2, 15-Apr-10
Page 6 of 17
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