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Figure 123:
Functional module diagram
Level detector
The level detector compares
AI_VALUE
to the
Start value
setting. The
Operation
mode
setting defines the direction of the level detector.
Table 234:
Operation mode types
Operation Mode
Description
"Under"
If the input signal
AI_VALUE
is lower than the set
value of the "Start value" setting, the level detector
enables the timer module.
"Over"
If the input signal
AI_VALUE
exceeds the set
value of the
Start value setting, the level detector
enables the timer module.
The
Absolute hysteresis
setting can be used for preventing unnecessary oscillations if
the input signal is slightly above or below the
Start value
setting. After leaving the
hysteresis area, the start condition has to be fulfilled again and it is not sufficient for
the signal to only return to the hysteresis area. If the
ENA_ADD
input is activated, the
threshold value of the internal comparator is the sum of the
Start value Add
and
Start
value
settings. The resulting threshold value for the comparator can be increased or
decreased depending on the sign and value of the
Start value Add
setting.
Timer
Once activated, the timer activates the
START
output. The time characteristic is
according to DT. When the operation timer has reached the value set by
Operate delay
time
, the
OPERATE
output is activated. If the starting condition disappears before the
module operates, the reset timer is activated. If the reset timer reaches the value set by
Reset delay time
, the operation timer resets and the
START
output is deactivated.
MAPGAPC can be blocked from the binary input
BLOCK
. The activation of the
BLOCK
input deactivates all outputs and resets internal timers. The start signals from
the function can be blocked from the binary input
BLK_ST
. The operate signals from
the function can be blocked from the binary input
BLK_OPR
. The operation timer
counting can be frozen to the prevailing value by activating the
FR_TIMER
input
signal.
Section 4
1MRS757256 F
Protection functions
188
PML630/Compact Load-Shedding Solution
Technical Manual
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