Dc/dc power supply – Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control User Manual
Page 138
138
Rockwell Automation Publication 7000-UM202B-EN-P - June 2014
Chapter 3
Component Definition and Maintenance
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 127 - 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.
24V-Isolators
24V-XIO
+/-24V-HECS
+/-15V Logic
5V-Logic
Sense Cable
DC/DC Power Supply
C hold-up
56V DC
+
–
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