Rockwell Automation T823X Trusted Power System - Manual (Page 28)

Trusted
TM
Power System T823X
Issue 9 Dec 08 PD-T823X 28
6. Power Controller
The Power Controller is designed to control and monitor the 19” 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 100mV steps over the range 24-28V
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
100mA.
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 ribbon cable should be tied back and left unused.
Figure 12 Power Controller Outline Drawing