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Rockwell Automation Publication 7000L-UM301F-EN-P - March 2020
Chapter 5
Component Definition and Maintenance
DC/DC Power
SupplyDescription
Description
The DC/DC power supply is used as a source of regulated DC voltage for
various logic control boards and circuits. The input to this power supply is from a
regulated 56Vdc source.
Figure 288 - DC/DC Converter Power Supply
The capacitor at the input terminals is for power dip ride-through purposes.
Upon loss of the 56V input, the capacitors (C hold-up) will maintain the voltage
level. This component is not required in all configurations.
Due to the critical nature of the ACB/DPM Logic power source, the DC/DC
power supply has been designed to provide redundancy for the +5V rail. There
are two se5V outputs, each capable of powering the logic boards. In the
event of one failing, the other power supply will be automatically switched in to
provide the output power.
DC/DC
Power Supply
+
-
+5V - LOGIC
+/-15V -
56VDC
C hold-up
+/- 24V - HECS
+24 V - ISOLATOR
+24V - IXO
Sense Cable
LOGIC