Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control - Manual (Page 129)

Rockwell Automation Publication 7000A-UM200C-EN-P - June 2014 129
Component Definition and Maintenance Chapter 3
DC/DC Power Supply Description
The DC/DC power supply is used as a source of regulated DC voltages for
various logic control boards and circuits. The input to this power supply is from a
regulated 56V DC source.
Figure 108 - 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 - LOGIC
56VDC
C hold-up
+/- 24V - HECS
+24V - ISOLATOR
+24 - XIO
Sense Cable