Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control (PanelView 550) - Manual (Page 113)

Rockwell Automation Publication 7000-UM151E-EN-P - January 2013 113
Component Definition and Maintenance Chapter 3
DC/DC Power Supply
The DC/DC power supply provides a source of regulated DC voltages for
various logic control boards and circuits., using a regulated 56V DC source.
Figure 87 - DC/DC converter power supply
The capacitor at the input terminals enables the equipment to ride through
power dips. If the capacitor (C hold-up) loses the 56V input, it maintains the
voltage level for a period of time to enable a controlled shut-down. 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 provides 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
drive switches to the other power supply automatically to provide the output
power.
DC/DC
Power Supply
+
-
+5V - LOGIC
+/-15V -
56VDC
C hold-up
+/- 24V - HECS
+24 V - ISOLATOR
+24V - XIO
Sense Cable
LOGIC