Instruction manual

ROC800-Series Instruction Manual
3-12 Power Connections Revised Jul-14
individual worksheets to determine how to best “tune” your
configuration and lessen power demands.
General Calculation
Process
To calculate the power requirements of a ROC800 configuration
requires:
1. Determine the kind and number of communication modules and the
kind and number of expanded backplanes you are implementing.
Enter those values in the Quantity Used column of Table 3-5.
2. Multiply the P
Typical
value by the Quantity Used. Enter the values in
the Sub-Total column of Table 3-5. Perform this calculation for
both the communications module and the LED.
3. Determine the kind and number of I/O modules you are
implementing and complete Tables 3-6 through 3-20 for those
modules. For each applicable I/O module:
a. Calculate the P
Typical
values and enter them in the P
Typical
columns of each table. Perform this calculation for the I/O
modules, LEDs (if applicable), channels (if applicable), and any
other devices.
b. Calculate the Duty Cycle value for each I/O module and each
I/O channel (as applicable). Enter those values in the Duty Cycle
column of Tables 3-6 through 3-20.
c. Multiply the P
Typical
values by the Quantity Used by the Duty
Cycle on each applicable table. Enter those individual sub-totals
in the Sub-Total column on each table and add the sub-totals to
calculate the Total for the table.
4. Transfer the totals from Tables 3-6 through 3-20 to their respective
lines in the Sub-Total column on Table 3-5.
5. Add the Sub-Total values for Tables 3-6 through 3-20. Enter that
value in the Total for All Modules line on Table 3-5.
6. Add the value from the Total for ROC800 Base Unit to the Total for
All Modules. Enter that result in the Total for ROC800 Base Unit
and All Modules line.
7. Transfer the Other Devices total from Table 3-20 to its respective
line in the Sub-Total column on Table 3-5.
8. Add the values from Total for ROC800 Base Unit, Total for All
Modules, and the total for Other Devices. Enter that value in the
Total for ROC800 Base Unit, All Modules, and Other Devices line.
9. Multiply the value in the Total for ROC800 Base Unit, Total for All
Modules, and Other Devices by 0.25. Enter the result in the Power
System Safety Factor (0.25) line.
Note: This value represents a safety factor to the power system to
account for losses and other variables not factored into the
power consumption calculations. This safety factor may vary