Ice NP900 Series, Инструкция по применению

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Application Guide - NP900 Series 89 (504
)
A996A
It is also important to check that the reset time settings are never set longer than the
desired operating time delay setting.
3.2.6.3 M
EASURED INPUT VALUES
For the function block is used analog current measurement values from the residual
magnitudes. Residual voltage has to be measured for this function to operate. Either I01
or I02 channel can be selected for residual current samples.
Table 3.2.6.3-63 Analogic magnitudes used by the IEF function.
Signal Description Time base
U0 samples U0 residual voltage per unitized samples circular buffer 5 ms
I01 samples I0 residual current per unitized samples circular buffer 5 ms
I02 samples I0 residual current per unitized samples circular buffer 5 ms
Selection of the used AI channel is made with a setting parameter.
3.2.6.4 P
ICK
-
UP CHARACTERISTICS
Pick-up of the IEF function is controlled by
U0 Detect spike > and I0 Detect spike >
setting parameters, which define the maximum allowed measured residual current and
voltage before action from the function. The function constantly calculates the ratio in
between of the setting and circular buffer maximum value.
Table 3.2.6.4-64 Pick-up characteristics setting
Name Range Step Default Description
U0 Detect spike > 1.00…100.00 %Un 0.01 %Un 80.00%Un Pick-up setting
U0
I0 Detect spike > 0.05…40.00 xI0n 0.01 xI0n 0.50 xI0n Pick-up setting
I0
The pick-up activation of the function is not directly equal to start-signal generation of the
function. Start signal is allowed if blocking condition is not active and if the input signal
calculated admittance delta exceeds these settings given admittance threshold. I0 Detect
spike > / U0 Detect spike > = set admittance delta threshold.
3.2.6.5 F
UNCTION BLOCKING
In the blocking element the block signal is checked in the beginning of each program
cycle. Blocking signal is received from the blocking matrix for the function 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.