Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control - Manual (Page 381)

Component Definition and Maintenance 6-77
7000 “A” Frame 7000A-UM150F-EN-P –June 2013
DC/DC Power Supply Description
The DC/DC power supply is used as a source of regulated DC voltage for
various logic control boards and circuits. The input to this power supply
is from a regulated 56Vdc source.
+24V - PRINTER,I/O
DC/DC
Power Supply
C
hold-up
DC/DC
WARN
SPGDB TEST
POWER ON
+5V - DCB LOGIC
+/-15V - DCB LOGIC
+/-24V - LEM
+12V - REM I/O
+15V - TACH
DC/DC
FAIL
+15V - SPGDB TEST
56 Vdc
-
+
Figure 6.62 – 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 DCB Logic power source, the DC/DC
power supply has been designed to provide redundancy for these voltages.
Each of the DCB Logic outputs is supplied internally with two separate
sources of power. In the event of one failing, the other power supply will
be automatically switched in to provide the output power.
DC FAIL – Each output to be internally monitored with a single output
fail. This output goes from low to high when any of the non-redundant
outputs fail or both of the redundant outputs of one particular voltage fails
(output voltage is < 95%).
DC WARNING – Each redundant output to be internally monitored with
a single output warning. This output goes from low to high before loss of
output regulation of any one of the redundant outputs (output voltage is
<95%).
SPGDB TEST POWER ON – The +15V output on COM4 will have its
load current monitored. This open collector output goes from low to high
when the load current exceeds 20 mA. The purpose of this signal is to
inform the user that the test harness for the SCRs is still attached to the
DC/DC converter.