Bailey Infi90 - Appendix B: Module Power Requirements; Calculating Current Requirements

INTRODUCTION
I-E96-508C B - 1
APPENDIX B - MODULE POWER REQUIREMENTS
INTRODUCTION
This section lists the power requirements of INFI 90 modules,
and termination unit and modules. Use this information to
calculate the 5 VDC, ±15 VDC and 24 VDC module current
requirements for each INFI 90 cabinet. The procedure for cal-
culating current requirements includes a worksheet for calcu-
lating system powered I/O current requirements.
After you calculate the current requirements for each cabinet,
calculate the number of modular power supplies needed for
each cabinet by following the instructions under SIZING THE
MODULAR POWER SYSTEM. Appendix D provides tables that
allow you to bypass the power system sizing calculations in
this section. Finally, there is a procedure to verify that the
total current draw of the power cabinet is within the power
entry panel specifications.
CALCULATING CURRENT REQUIREMENTS
Tables B-1 and B-2 contain a list of all INFI 90 modules, termi-
nation units and modules and their operating current require-
ments. Use Table B-3 to calculate system powered I/O current
requirements. To use the information in these tables:
NOTE:
Current consumption values listed in the tables apply to one
module. Multiply the value of current consumption per module by the
number of those modules in the cabinet. For example, if a cabinet
contains four IMASI02 modules, the total 5 VDC current consump-
tion of these modules is 4 x 85 mA = 340 mA.
1. Make a list of modules contained in the cabinet you are
sizing for modular power supplies.
2. Calculate the 5 VDC current requirement for each cabinet.
a. Refer to Table B-1 for the 5 VDC current requirement of
each module.
b. Total the 5 VDC current requirement per cabinet.
3. Calculate the +15 VDC current requirement for each
cabinet.
a. Refer to Table B-1 for the +15 VDC current require-
ment of each module.
b. Total the +15 VDC current requirement per cabinet.