3. Power Shelf Specification Trusted Power System
8 Issue 11 Rockwell Automation Publication PD-T823X
3.2. Output Connector
The Power Shelf has two terminal blocks for DC output (each with three M4 screws). The V+
and V- are floating with respect to frame GND, either of which can be connected to GND as
required.
3.3. Current Sharing
Note: If there is a low load on a Power Shelf (less than 2 A per Power Pack) then the current sharing circuit may
not work correctly and the ‘PWR OK’ LED may not illuminate on the Power Packs.
In systems where more than one Power Shelf is being used, Shelves should connect their CS
terminals by using a Power Shelf Interconnect cable TC-323. This ensures that the Power
Shelves current share.
Do not connect the TC-323 cable between ‘A’ and ‘B’ supplies or between two sets of
Shelves which connect to separate busbars. The supplies will attempt to share current
between the two busbars, which may damage the power packs and shelves’ sensing circuits.
Unused connectors on the TC-323 cable should be tied back and left unused.
3.4. Interface Connector
The Power Shelf has an optional DSB, 25-pin, female interface connector on the back. The
Power System can be monitored and controlled through this interface, by a Power
Controller, using a Power Shelf Interconnect. AC and DC fail alarms are available from a
separate connector on the Power Port.
Pin Number Signal Name Description
1 DC Fail_2 DC Fail signal of the second Power Pack
2 A2 I
2
C address bit 2
3 A3 I
2
C address bit 3
4 ON SYNC Not Used
5 SDA I
2
C Serial data bus
6 SCL I
2
C Clock
7 NC No connection
8 On/Off_1 Remote on off control for the first Power Pack - Not Used
9 OTP_1 Fan Fail or Over-temperature signal for the first Power Pack
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