ABB RELION REX640, Техническое руководство, Страница: 266 / 1960

PULSE_INPUT
RESET
FREEZE_COUNT
VALUE_READ
Scaling
Pulse
counter
COUNT_SAT
READ_VALUE
Figure 148: Functional module diagram
Pulse counter
This module counts the number of pulses available at PULSE_INPUT. The count value
is incremented depending upon
Count criteria setting.
Table 250: Relation between setting Count criteria and count value behavior
Count criteria
values PULSE_INPUT count value
Rising edge Count value is incremented on the rising edge of PULSE_IN-
PUT.
Falling edge Count value is incremented on the falling edge of PULSE_IN-
PUT.
On change Count value is incremented each time a rising edge or falling
edge is available at PULSE_INPUT.
Freeze Counting is frozen.
The count value is available at COUNT_VALUE in the Monitored data view and is
stored in a nonvolatile memory. This output is updated cyclically and sent to the
station HMI over various communication protocols, depending on the Reporting
interval setting. The start of
Reporting interval corresponds to the start of the
function operation in the protection relay.
Binary output
VALUE_READ
activates for a fixed 200 ms each time the reporting
timer completes its cycle. It is also possible to update COUNT_VALUE before
completion of Reporting interval and make it available for communication
by providing a minimum 1-second-long pulse at
READ_VALUE
input. Besides
COUNT_VALUE activation,
READ_VALUE
also activates output
VALUE_READ
for 200
ms.
The activation of RESET resets COUNT_VALUE to zero. Activation of FREEZE_COUNT
freezes further counting.
Changing
Count criteria does not reset COUNT_VALUE.
Scaling
This module scales the count value available at COUNT_VALUE. The scaling depends
on the
Unit selection setting. When the function is used for general-purpose
counting,
Unit selection is set as "Count" and the count value is multiplied by the
Pulse quantity setting to calculate the scaled value.
Basic functions 1MRS759142 F
266 REX640
Technical Manual