ABB REL 551-C1*2.5 - Logic Diagram; Input and Output Signals

66
Instantaneous non-directional overcurrent
protection (IOC)
Chapter 5
Current
1.4 Logic diagram
Figure 24: IOC function, logic diagram
1.5 Input and output signals
Table 75: Input signals for the IOC (IOC--) function block
Path in local HMI: ServiceReport/Functions/InstantOC/FuncOutputs
IOC--BLOCK
IOC--TRIP
en01000180.vsd
&
Function Enable
IOC - INSTANTANEOUS PHASE OVERCURRENT FUNCTION
>1
STIL1
&
&
&
&
STIL2
STIL3
IOC--TRP
IOC--TRL1
IOC--TRL2
IOC--TRL3
>1
>1
&
IOC--TRN
STIN
TEST-ACTIVE
&
TEST
BlockIOC = Yes
Signal Description
BLOCK Block of the instantaneous overcurrent protection function.