Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 358)

6-68 Component Definition and Maintenance
7000-UM150I-EN-P – June 2013 7000 “B” Frame
AC/DC Power Supply
Each AC/DC converter is rated for 1500W at 50°C and 1525 m
(5000 feet). Above these two limits, de-rating factors are used to
reduce the capacity of the converter. The converter must always
have a minimum 20% margin; that is, its power output must not
exceed 80% of its maximum rating. The load demands on the
AC/DC converters are the DC/DC converter and up to six IGDPS
modules. The DC/DC is a fixed load; however, the quantity of
IGDPS modules will vary depending upon the drive configuration.
These factors are used in determining the quantity of AC/DC
converters needed per drive.
If more than one module is needed, the modules are connected in
parallel and operate in a current sharing mode. In parallel operation,
there will be just one AC Fail signal, and each module DC Fail
signal will be individually monitored.
Description
The AC/DC power supply accepts 3

voltage and produces a
regulated 56Vdc output for the DC/DC power supply and the HV
IGDPS modules for the SGCTs. The input and output voltages are
monitored and fail signals are annunciated upon either voltage going
below a pre-set level.
3 phase
95-265V ac
47-63 Hz
2% V
unbalance
DC
FAIL
AC
FAIL
AC/DC
Power Supply
56V, 1500 W
4
DC/DC
Power
Supply
HV IGDPS
Power
Supply
Figure 6.50 – AC/DC converter power supply
AC FAIL: Upon loss of AC line (V input ≤ 90 VAC), this open collector
output goes from low to high before loss of output regulation.
DC FAIL: Upon loss of DC output (50.4VDC ≤ V output ≤ 53.8 VDC,
-7%, ±3%) this output goes from low to high.