5. Power Port Trusted Power System
22 Issue 11 Rockwell Automation Publication PD-T823X
connectivity to be extended to a Power Controller using a Power Shelf Interconnect ribbon
cable.
The Power Controller is powered from the Power Port 24 V supply via pin 7, when
connecting CON 2 on the Power Port to the Power Controller.
5.2. Circuit Description
The circuit is split into four functional sections: supply, DC alarms, AC alarms and jumpers.
5.2.1. Supply
The 24 V supply is connected to CON3 pins 1 and 6. The supply should be fused close to its
source, using a 500 mA F rated fuse. It is nevertheless protected by a non-replaceable fuse
on the Power Port. The 24 V is regulated down to 5 V with decoupling provided. The 5 V+ is
used to supply the low voltage electronics. The 24 V is used to supply the relays and is
connected through CON2 to power the optional Power Controller.
5.2.2. DC Alarms
CON1 is the 25 way D male interface to the Power Shelf. The Power Pack and Power Shelf
alarm outputs are derived from here. There are two DC alarms per Power Pack: DCFAIL (dc
output fail) and OTP (over-temperature protection). The Power Port ORs together DCFAIL
and OTP to give one DC fail alarm, via CON 3. If either alarm triggers, the corresponding
relay de-energises.
Each relay operates a volt-free contact. These are closed when healthy (relay energised) and
open in alarm. The contacts share a common return line.
5.2.3. AC Alarms
In a similar manner, each Power Pack generates an AC alarm. When an alarm is triggered,
the corresponding relay de-energises. Each relay operates a volt-free contact. These are
closed when healthy (relay energised) and open in alarm. The contacts share a common
return line.
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