Calculation Example Of Power Capacity - FATEK FBs Series User Manual

5.3.3 Calculation Example of Power Capacity

Power module selection is depending on the sum of current consumption of all modules. Therefore, user must
know the current consumption of each module. Please refer to the above table, which has the maximum current
consumption of each expansion module.
Before power module selection, we need to calculate the total current consumptions. Calculations need to be
divided into two sections, DC5V (Bus Power) current consumption and DC24V (Bus Power) current consumption.
User must consider the match between power and expansion modules cannot cause BusPower output power of
any one group of overload use.
Example 1: The below diagram is a system modules, try to calculate the power supply used of the system.
Internal 5VDC logic power
supply
Internal 24VDC logic power
supply
External 24VDC Sensor
power supply
R e s u l t : ( 1 ) F i r s t c a l c u l a t e c u r r e n t c o n s u m p t i o n o f i n t e r n a l 5 V D C l o g i c p o we r s u p p l y
+ 7 2 2 m A - 1 2 0 m A - 2 2 3 m A - 11 9 m A - 4 0 m A - 2 5 m A = + 1 9 5 m A
( 2 ) A n d t h e n c a l c u l a t e c u r r e n t c o n s u m p t i o n o f i n t e r n a l 2 4 V D C l o g i c p o we r s u p p l y
+ 3 2 5 m A - 1 2 4 m A - 1 3 6 m A = + 6 5 m A
( 3 ) C a l c u l a t e c u r r e n t c o n s u m p t i o n o f e x t e r n a l 2 4 V D C S e n s o r p o we r s u p p l y
+ 2 9 5 m A - 1 6 2 m A - 5 3 m A = + 8 0 m A
In conclusion, the total current consumption of the above five modules cannot exceed the total current consumption
of the main unit, so do not need to expand any power supply module.
Example 2: The below diagram is a system modules, try to calculate the power supply used of the system.
I n t e r n a l 5 V D C l o g i c
p o w e r s u p p l y
I n t e r n a l 2 4 V D C l o g i c
p o w e r s u p p l y
E x t e r n a l 2 4 V D C
S e n s o r p o w e r s u p p l y
FBs- FBs-
FBs-
CM55E 24MC
B2DA
- 1 2 0 - 2 2 3 + 7 2 2
－ －
+ 3 2 5
－ －
+ 2 9 5
FBs-
FBs-
FBs-
CM55E 24MC
B2DA
- 1 2 0 - 2 2 3 + 7 2 2
－ －
+ 3 2 5
－ －
+ 2 9 5
H5-7
FBs- FBs- FBs-
60XYR 16YR 6AD
- 11 9 - 4 0
- 1 2 4 - 1 3 6
－
- 1 6 2
( O K )
( O K )
FBs- FBs-
FBs-
60XYR 16YR 16YR
- 11 9 - 4 0 - 4 0
- 1 2 4 - 1 3 6 - 1 3 6
－ －
- 1 6 2
Un it : mA
R e s u l t
- 2 5 + 1 9 5 ( O K )
－
+ 6 5 ( O K )
- 5 3 + 8 0 ( O K )
( O K )
FBs-
6AD
Un it : mA
R e s u l t
- 2 5 + 1 5 5 ( O K )
－
- 7 1 ( o v e r l o a d )
- 5 3 + 8 0 ( O K )