Owner manual

4-46 Component Definition and Maintenance
7000A-UM151D-EN-P – March 2013 7000 “A” Frame
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.
DC/DC
P o wer S upply
+
-
+5V - LOGIC
+/ -15V - LOG IC
56VDC
Chold-up
+/- 24 V - HECS
+24V - ISOLATO
R
+24 - XIO
Sense Cable
Figure 4.35 – 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.