Veesta World V-RTU2000 Series Technical Information page 18

V-RTU2000 Series
Veesta - Remote Terminal Unit
Technical Specification Manual
2.2.2.1 Trip/Close Command
2.2.2.2 Set-point Command
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There are two types of control output using Trip/Close command, one
is ON/OFF operation output to control CBs, ABSs; the other is
Regulation operation output (raise/lower) to control the position of
transformer taps. Two distinct types of Trip/Close commands are
supported:
 Execute Immediate Command: Direct Trip/Close Command, are
executed as a single command message, and transmitted to the
addressed RTU.
 Select Before Operate (SBO) Command: Select Trip/Close
Command & Operate Command, are executed as two distinct
commands to the addressed RTU; a select command followed by
an execute command. The SBO controls are used when secure
operation is required such as the Trip and Close operations of
Power Circuit Breakers. RTU reset its control logic if the Operate
Command is not received within the User defined time period
maximum 60 sec, initially 20 sec, of the command message. The
operating sequences for SBO command are:
1. After received the Select Trip/Close Command, the RTU
initialize its control logic, check and verify its control circuit,
reassemble the command message, then transmit the
reassembled message to the Master Station.
2. If the Operate Command is received within the user defined
time period and last command is Select Trip/Close Command,
the RTU will operate the control point.
The result of Trip/Close command is the output of a pulse of fixed
duration (determined by the Database Configuration) at the
specifically addressed Digital Output (DO) point. Only one point can
be controlled at a time.
There are two types of control output using Direct Set-point
command, one is Digital Direct Set-point, and the other is Analog
Direct Set-point.
 Digital Direct Set-point Command: Raise/Lower command, can
cause the addressed Digital Output (DO) point(s) to perform the
Pulse Width control output for a Generator Controller. The time
duration of output pulse is specified in the command message
from Master Station.
simultaneously.
 Analog Direct Set-point Command: cause the addressed
Analog Output (AO) point to perform a current or voltage output
for a Generator Controller. The output value is specified in the
command message from Master Station.
Chapter 2 - System Overview
Multiple points can be controlled
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