beautypg.com

Dc/dc power supply – Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control User Manual

Page 138

background image

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

+