346 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 separate +5V 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
Chold-up
+/- 24V - HECS
+24 V - ISOLATOR
+24V - IXO
Sense Cable
LOGIC
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