U L T R A F L E X H D P D U U S E R M A N U A L
3.7.4
48V DC Output Voltage
The output voltage will vary slightly with load. The output voltage of the PDU is 48V @ full load. Refer to
below for the output voltage at various loads. The output voltage range over entire load range is
48.5V +/- 0.5V. External adjustments of the 48V output are not available.
Graph 1 – Output V vs. load graph
DC Output Voltage
(4 Rectifiers)
47.4
47.6
47.8
48.0
48.2
48.4
48.6
48.8
49.0
49.2
DC load
DC Output Voltage
DC Output V
DC Output V 49.0 49.0 48.9 48.7 48.6 48.5 48.4 48.3 48.2 48.1 48.0 48.0 48.0
0
25
50
75
100 125 150 175 200 225 250 275 300
3.8
EMO loop
The PDU contains an EMO loop which will shut down the PDU if the loop is broken. When the EMO loop
is broken CB1 is opened. The EMO supply still remains powered up. The EMO connectors on the PDU are
J67, J68, J69 and J70 and are located on the rear of the PDU. A jumper is provided in J70 on all PDU’s since
an external power vault is not always used. When the EMO loop is broken, the 24V EMO voltage to the UVR
on the input breaker is lost resulting in the circuit breaker tripping which shuts down the PDU. The EMO
loop connectors used for J67, J68 and J69 are housing 770024-1 with sockets 1-770008-0. Recommended
mating connector for J67, J68 and J69 is housing 770017-1 with pins 1-770007-0. The EMO loop connector
used for J70 is housing 770027-1 with sockets 1-770008-0 and1-770006-0. Recommended mating connector
for J70 is housing 770020-1 with pins 1-770007-0. Refer to
EMO connectors.
708401 Rev B
Page 26 of 38
