ABB AC 800M, Hardware And Operation

Page: 204 / 230

Current Consumption and Power Dissipation Appendix B Power Consumption
204 3BSE 027 941 R301
Calculations
1. Calculate the current requirements for each bus (ModuleBus and CEX-bus). Be
sure not to exceed the limits given in
Table 65 on page 203. Data relating to
TB820, TB840 and CI830 is accessible from the S800 I/O documentation.
See
Related Documentation on page 17.
2. Calculate the current consumption at 24V, for each electrical ModuleBus, by
adding::
I
m
= I
(24 V)
+ I
(5 V)
x 0.3
3. To calculate the requirement for a specific power supply unit, total the results
of the 24V current consumption calculations, as follows:
I
tot
= I
m1
+ I
m2
+ .... + I
units Table 64
+ I
CI830s
+ I
TB820s
+ I
TB840s
If redundant CPUs are used, current for both CPUs must be included.