Specifications

22
POWERCASSETTE FRONT-END
OPERATING MANUAL
approximately +5V.
Disconnect the wire from the Inhibit to - Sense. The DC Power Good green
LED should turn on. Check the output voltage on the DC Power Good pin as
described above. The voltage should be a logic LO, +0.5V or less.
18.9 Testing the Other Power Cassettes. For a rack with two or three
PowerCassettes, the other PowerCassettes should be plugged into Position
A in the rack and tested in the same manner as above in Sections 18.2 to
18.8.
18.10 Testing the Complete Power Cassette Rack. With the input power source
off or disconnected, insert all PowerCassettes into the rack. Connect a
resistive power load of approximately 80% of full load value for a single
PowerCassette across the output. Connect a color-coded, twisted pair of
remote sense leads to the load, being careful to connect the correct
polarity.
Turn on or plug in the input power source. Check the voltage across the load
with a digital voltmeter. The voltage should be within about ± 1% of its
nominal value. The AC Power Fail and DC Power Good green LEDs
should be on for both units.
While the rack is operating, disengage PowerCassette A (left one) and
check the output voltage. It should be very close to the previous value and the
DC Power Good green LED should remain on for PowerCassette B (and C)
which are now carrying the full power load. Re-insert PowerCassette A and
repeat the procedure by disengaging PowerCassette B (then C). The com-
plete rack has now been shown to operate properly in the redundant mode
with hot swapping. Disconnect the input power source.