Trusted Power System 6. Power Controller
Rockwell Automation Publication PD-T823X Issue 11 27
6. Power Controller
The Power Controller is designed to control and monitor the 19 inch rack mount 1U high
Power Shelf Units. It is used to address each Power Pack in turn and adjust the respective
Power Pack voltage.
The Power Controller is a digital system and communicates with the Power Packs by means
of a TC-323 Power Shelf Interconnect ribbon cable, via the Power Port. The shelf addresses
are set using jumpers on the Power Port, as described in paragraph 5.2.4.
The Power Controller offers adjustment of the system voltage in 100 mV steps over the
range 24-28 V for the Power Packs. Power supplies share through their analogue control
circuitry. A Power Controller will ensure that a power supply, regardless of its voltage setting
when plugged in, is adjusted (via the I
2
C serial data bus) to be within the current/voltage
sharing window of the power supply’s analogue control circuitry.
The front panel contains two switches. The Address switch is used to select a Power Pack.
The Voltage switch is used to raise or lower the voltage of that Power Pack. The two displays
show the current and voltage of that Power Pack.
Up to 12 hot swap Power Packs can be used in parallel. The Power Controller can be used to
select a particular Power Pack’s position and read the current being drawn from that unit
with a resolution of 100 mA.
Note that the Power Controller should not be connected to power supplies on different
busbars with the TC-323 cable, because it will attempt to perform load sharing between
unconnected power supplies. It may also be presented with power supplies having duplicate
addresses on its I
2
C bus.
Unused connectors on the TC-323 cable should be tied back and left unused.
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