ABB RELION REX640, Техническое руководство, Страница: 1528 / 1960

Motor logic and parameters
To prevent damage to the motor, the motor is protected by several settable
timeouts. With setting parameter
Motor start timeout, the maximum start time
for the motor to recognize a position indication change is defined. If a position
indication change is not recognized during this time, the motor is stopped. If
Motor
start timeout is set to zero, the motor start timeout is disabled.
With timeout
Operation timeout DC, the maximum time for the disconnector to go
from one state to another is defined.
With timeout
Operation timeout ES, the maximum time for the earthing switch to
go from one state to another is defined. If a state change is not fulfilled within this
time, the motor is stopped.
If an unexpected position is detected based on the requested command, in other
words the motor is running in the wrong direction, or if faulty position of the
switch is detected, the motor is immediately stopped. Additionally, an activated
block input that corresponds to the active command stops the running motor
immediately.
If any of the cases above occur, the specific event is displayed on the HMI or
reported via communication.
When the motor operates and reaches the final destination, the motor brakes if
the
Motor braking setting is selected as "True". The braking time of the motor
is selectable with the
Motor brake time parameter. After the motor has braked
and stopped, the motor is in a free state, meaning that the switch is mechanically
operable by hand-crank. A successful operation is also displayed on the HMI or
reported via communication.
After each operation the motor is paused for one second before any new control
command can pass through.
9.2.4.7 Control methods
The command execution mode can be set with the Control model setting. The
alternatives for command execution are direct control and secured object control,
which can be used to secure controlling.
The secured object control SBO is an important feature of the communication
protocols that support horizontal communication, because the command
reservation and interlocking signals can be transferred with a bus. All secured
control operations require two-step commands: a selection step and an execution
step. The secured object control is responsible for several tasks.
• Command authority: ensures that the command source is authorized to operate
the object.
• Mutual exclusion: ensures that only one command source at a time can control
the object.
• Interlocking: allows only safe commands.
• Execution: supervises the command execution.
• Command canceling: cancels the controlling of a selected object.
In direct operation, a single message is used to initiate the control action of a
physical device. The direct operation method uses less communication network
capacity and bandwidth than the SBO method, because the procedure needs fewer
messages for accurate operation.
Control functions 1MRS759142 F
1528 REX640
Technical Manual