Specifications

8
POWERCASSETTE FRONT-END
OPERATING MANUAL
9.0 DESCRIPTION OF FEATURES & OPTIONS
DESCRIPTION
The input current is a sine wave in-phase with the input voltage to
give a power factor of 0.99. Input current total harmonic distortion
meets EN61000-3-2.
The AC input range is continuous from 85 to 265VAC, 47-63Hz,
for worldwide operation.
This filter suppresses conducted noise from the supply back onto
the AC line. The filter meets FCC20780 part 15J Curve B and
EN55022 Curve B.
When the unit is turned on, the initial input current is limited to a
peak value of 30 amperes AC. This is accomplished by an active
current limiting circuit (not a thermistor).
If the PowerCassette overheats internally, it will automatically shut
down. The DC Power Good LED turns off. The Overtemperature
Warning goes HI and the DC Power Good signal goes HI. After a
few minutes the unit will cool down and automatically start up
again.
The PowerCassette front end will automatically current share with
another identical unit. A single-wire connection provides this. The
output actively current shares with an accuracy of 10% of full load
output current for a total load of 50% to 100%.
A diode in series with the output protects the output of parallel-
connected PowerCassettes. If one output fails to a short or to a
lower than normal output voltage, the other output is not affected.
Also when hot-swapping units in the rack, the diode prevents a
glitch in the output voltage while the output is still rising on the
inserted supply. The 5V, ¼A standby output also has an ORing
diode.
This is an independent output which is not controlled by the
Enable or Inhibit inputs. This output also has an ORing diode and
can be paralled with another PowerCassette Standby Output.
The output is protected from overvoltage due to fault conditions in
the supply. Overvoltage protection is set at approximately 10%
above the nominal output voltage level. The result is a latched
shutdown of the supply. It is reset by cycling the AC input off and
then back on.
The PowerCassette output can be operated down to zero load
while maintaining output regulation.
Power Factor Correction
Wide Range AC Input
EMI Input Filter
Inrush Current Limiting
FEATURE / OPTION
Thermal Protection
Current Sharing
ORing Diodes
5V, ¼A Standby Output
Overvoltage Protection
No Load Operation