ABB Advant AC500 - Page 58

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V2 AC500 Hardware 1-58 System data AC500 / Issued: 05.2007
Calculation of the total current consumption
In the following example, the aC500 control system consists of
- the CPU PM581-ETH
- the 4 communication modules CM572-DP (1x), CM575-DN (1x), CM577-ETH (1x), CM578-CN (1x)
- the 7 expansion modules DC522 (1x), DC523 (1x), DC532 (1x), AX521 (1x), AX522 (1x), AI523 (1x),
AO523 (1x)
- as well as the required Terminal Bases and Terminal Units
Remark: Because of the high total current consumption of the digital I/O modules (from UP = 24 DC),
the supply is divided up into several electric circuits fused separately. The maximum permitted total
current over the supply terminals of the I/O Terminal Units is 8 A.
The total current can be calculated as follows:
I
Total
= I
CLUSTER
+ I
UP
with the following assumptions
I
CLUSTER
= I
CPU
+ I
I/O-Bus
+ I
C1
+ I
C2
+ I
C3
+ I
C4
(CPU + couplers + I/O-Bus)
I
I/O-Bus
= Number of expansion modules x Current consumption through the I/O-Bus per module
and
I
UP
= I
UP1
+ I
LOAD1
+ I
UP2
+ I
LOAD2
+ I
UP3
+ I
LOAD3
+ I
UP4
+ I
LOAD4
+ I
UP5
+ I
LOAD5
+ I
UP6
+ I
LOAD6
+ I
UP7
+ I
LOAD7