Logic Diagram; Input And Output Signals; Setting Parameters - ABB REL 551-C1*2.5 Technical Reference Manual

1.4
1.5
1.6
Current circuit supervision, current based
(CTSU)

Logic diagram

CTSU-BLOCK
I L1
∑
I
L2
I
L3
I ref
1,5 x I r
OPERATION
Figure 32: Simplified logic diagram for the current circuit supervision

Input and output signals

Table 93: Input signals for the CTSU (CTSU-) function block
Signal
BLOCK
Path in local HMI: ServiceReport/Functions/CTSupervision/FuncOutputs
Table 94: Output signals for the CTSU (CTSU-) function block
Signal
FAIL
ALARM

Setting parameters

Path in local HMI: Settings/Functions/Groupn/CTSupervision
Table 95: Setting parameters for the current circuit supervision CTSU (CTSU-) function
Parameter Range
Operation Off, On
IMinOp 5-100
Step: 1
I>
+
∑
-
+ +
∑ ∑
+
-
x 0,8
>1 10 ms
Description
Block function
Description
Current circuit failure
Alarm for current circuit failure
Default Unit
Off -
20 % of I1b
Secondary system supervision
&
>1
20 ms 100 ms
CTSU-ALARM
150 ms 1 s
Description
Operating mode for CTSU function
Minimum operate phase current
Chapter 6
CTSU-FAIL
en03000115.vsd
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