Function blocking
The block signal is checked in the beginning of each program cycle. The blocking signal is received
from the blocking matrix in the function's dedicated input. If the blocking signal is not activated when
the pick-up element activates, a TRIP signal is generated.
If the blocking signal is active when the pick-up element activates, a BLOCKED signal is generated and
the function does not process the situation further.
The blocking of the function causes an HMI display event and a time-stamped blocking event with
information of the startup current values and its fault type to be issued.
The blocking signal can also be tested in the commissioning phase by a software switch signal when
the relay's testing mode "Enable stage forcing" is activated (
General
→
Device).
The variables the user can set are binary signals from the system. The blocking signal needs to reach
the device minimum of 5 ms before the set operating delay has passed in order for the blocking to
activate in time.
Events and registers
The arc fault protection function (abbreviated "ARC" in event block names) generates events and
registers from the status changes in START, TRIP, and BLOCKED. The user can select which event
messages are stored in the main event buffer: ON, OFF, or both.
The events triggered by the function are recorded with a time stamp and with process data values.
Table. 5.3.14 - 136. Event codes.
Event number
Event channel
Event block name
Event code
Description
4736
74
ARC1
0
Zone 1 Trip ON
4737
74
ARC1
1
Zone 1 Trip OFF
4738
74
ARC1
2
Zone 1 Block ON
4739
74
ARC1
3
Zone 1 Block OFF
4740
74
ARC1
4
Zone 2 Trip ON
4741
74
ARC1
5
Zone 2 Trip OFF
4742
74
ARC1
6
Zone 2 Block ON
4743
74
ARC1
7
Zone 2 Block OFF
4744
74
ARC1
8
Zone 3 Trip ON
4745
74
ARC1
9
Zone 3 Trip OFF
4746
74
ARC1
10
Zone 3 Block ON
4747
74
ARC1
11
Zone 3 Block OFF
4748
74
ARC1
12
Zone 4 Trip ON
4749
74
ARC1
13
Zone 4 Trip OFF
4750
74
ARC1
14
Zone 4 Block ON
4751
74
ARC1
15
Zone 4 Block OFF
4752
74
ARC1
16
Phase current Blocked ON
4753
74
ARC1
17
Phase current Blocked OFF
4754
74
ARC1
18
Phase current Start ON
A
AQ
Q-C213
-C213
Instruction manual
Version: 2.04
199