The pick-up activation of the function is not directly equal to the START signal generation of the
function. The START signal is allowed if the blocking condition is not active.
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 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.
Operating time characteristics for activation and reset
The behavior of the function's operating timers can be set for activation as well as for the monitoring
and release of the cold load pick-up situations.
The following table presents the setting parameters for the function's time characteristics.
Table. 5.6.3. - 111. Settings for operating time characteristics.
Name
Range
Step Default
Description
Phase THD alarm
delay
0.000…
1800.000 s
0.005
s
10.000
s
De nes the delay for the alarm timer from the phase
currents' measured THD.
I01 THD alarm
delay
0.000…
1800.000 s
0.005
s
10.000
s
De nes the delay for the alarm timer from the residual current I01's
measured THD.
I02 THD alarm
delay
0.000…
1800.000 s
0.005
s
10.000
s
De nes the delay for the alarm timer from the residual current I02's
measured THD.
Events and registers
The total harmonic distortion monitor function (abbreviated "THD" in event block names) generates
events and registers from the status changes in the alarm function when it is activated. The recorded
signals are START and ALARM signals for the monitoring elements as well as common BLOCKED
signals. The user can select the status ON or OFF for messages in the main event buffer.
The triggering event of the function (THD START, ALARM or BLOCKED) is recorded with a time stamp
and with process data values.
Table. 5.6.3. - 112. Event codes.
Event number
Event channel
Event block name
Event code
Description
3520
55
THD1
0
THD Start Phase ON
AQ-E215
Instruction manual
Version: 2.01
137
© Arcteq Relays Ltd
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