Rockwell Automation 7000L PowerFlex 7000 Medium Voltage AC Drive C Frame - Marine - Manual (Page 260)

4-84 Component Definition and Maintenance
7000L-UM302B-EN-P – June 2013 7000 ―C‖ Frame - Marine
DC/DC Power Supply 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.
DC/DC
Power Supply
+
-
+5V - LOGIC
+/-15V -
56VDC
C hold-up
+/- 24V - HECS
+24 V - ISOLATOR
+24V - IXO
Sense Cable
LOGIC
Figure 4.64 – 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.