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 START signal is generated and the function proceeds to the time
characteristics calculation.
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. If the START function has been activated before the
blocking signal, it resets and the release time characteristics are processed similarly to when the pick-
up signal is reset.
The blocking of the function causes an HMI display event and a time-stamped blocking event with
information of the startup frequency values.
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 rate-of-change of frequency function (abbreviated "DFT" 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. 5.3.15 - 138. Event codes.
Event number
Event channel
Event block name
Event code
Description
6592
103
DFT1
0
df/dt>/< (1) Start ON
6593
103
DFT1
1
df/dt>/< (1) Start OFF
6594
103
DFT1
2
df/dt>/< (1) Trip ON
6595
103
DFT1
3
df/dt>/< (1) Trip OFF
6596
103
DFT1
4
df/dt>/< (2) Start ON
6597
103
DFT1
5
df/dt>/< (2) Start OFF
6598
103
DFT1
6
df/dt>/< (2) Trip ON
6599
103
DFT1
7
df/dt>/< (2) Trip OFF
6600
103
DFT1
8
df/dt>/< (3) Start ON
6601
103
DFT1
9
df/dt>/< (3) Start OFF
6602
103
DFT1
10
df/dt>/< (3) Trip ON
6603
103
DFT1
11
df/dt>/< (3) Trip OFF
6604
103
DFT1
12
df/dt>/< (4) Start ON
6605
103
DFT1
13
df/dt>/< (4) Start OFF
6606
103
DFT1
14
df/dt>/< (4) Trip ON
6607
103
DFT1
15
df/dt>/< (4) Trip OFF
6608
103
DFT1
16
df/dt>/< (5) Start ON
A
AQ
Q-F205
-F205
Instruction manual
Version: 2.04
204
© Arcteq Relays Ltd
IM00013
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