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PCHS/TPCHS SERIES Quick-Set PowerCassette®
INSTALLATION & OPERATING MANUAL
Manual No. tpchs-2
pchs-tpchs-man-rev2-1214.indd
10.0 DESCRIPTION OF FEATURES & OPTIONS
FEATURE / OPTION
DESCRIPTION
Power Factor Correction 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. This is for AC input models.
Wide Range AC Input The AC input range is continuous from 85 to 265VAC, 47-63Hz,
for worldwide operation.
EMI Input Filter
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 PowerCassette is installed in a compatible rack.
Wide Range DC Input The DC input range is 36 to 72VDC with 48VDC as the nominal
input. The DC input also has an EMI input filter.
Reverse Polarity Protection The DC input models are reverse polarity protected by means of an
input diode.
Inrush Current Limiting When the unit is turned on, the initial input current is limited to a
peak value of 30 amperes (AC input) or 10 amperes (DC input).
This is accomplished by an active current limiting circuit (not a
thermistor).
Thermal Protection If the PowerCassette overheats internally, it will automatically
shut down. The Output Good LED turns off. The Overtemperature
Warning and Output Power Good signals both go LO. After a few
minutes the unit will cool down and automatically start up again.
Current Sharing The PowerCassette will automatically current share with another
identical PowerCassette. A single-wire connection for V1, V2,
and V3 provides this. The outputs actively current share with an
accuracy of 10% of their full load output current for total loads of
50% to 100%. V4 and V5 also current share but employ the droop
method.
ORing Diodes A diode in series with each output protects the outputs 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, 1A standby output also has an ORing diode.
5V, ¼A Standby Output This is an independent output which is not controlled by the Enable
or Inhibit inputs. The output also has an ORing diode and can be
paralled with another PowerCassette Standby Output.
Overvoltage Protection V1, V2 and V3 outputs are 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
input off and then back on.
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