Status indication and validity check
The object state is defined by two digital inputs, POSOPEN and POSCLOSE, which are also available as outputs OPENPOS and CLOSEPOS together with the OKPOS according to Table 1. The debouncing and short disturbances in an input are eliminated by filtering. The binary input filtering time can be adjusted separately for each digital input used by the function block. The validity of the digital inputs that indicate the object state is used as additional information in indications and event logging. The reporting of faulty or intermediate position POSITION (Monitored data) of the apparatus occurs after the Event delay setting, assuming that the circuit breaker is still in a corresponding state.
| Input | Status | Output | |||
|---|---|---|---|---|---|
| POSOPEN | POSCLOSE | POSITION (Monitored data) | OKPOS | OPENPOS | CLOSEPOS |
| 1=True | 0=False | 1=Open | 1=True | 1=True | 0=False |
| 0=False | 1=True | 2=Closed | 1=True | 0=False | 1=True |
| 1=True | 1=True | 3=Faulty/Bad (11) | 0=False | 0=False | 0=False |
| 0=False | 0=False | 0=Intermediate (00) | 0=False | 0=False | 0=False |
Enabling and blocking
CBXCBR has an enabling and blocking functionality for interlocking and synchrocheck purposes.
Circuit-breaker control CBXCBR
Normally, the CB closing is enabled (that is, CLOSE_ENAD signal is TRUE) by activating both ENA_CLOSE and SYNC_OK inputs. Typically, the ENA_CLOSE comes from the interlocking, and SYNC_OK comes from the synchronism and energizing check. The input SYNC_ITL_BYP can be used for bypassing this control. The SYNC_ITL_BYP input can be used to activate CLOSE_ENAD discarding the ENA_CLOSE and SYNC_OK input states. However, the BLK_CLOSE input always blocks the CLOSE_ENAD output.
The CB opening ( OPEN_ENAD) logic is the same as CB closing logic, except that SYNC_OK is used only in closing. The SYNC_ITL_BYP input is used in both CLOSE_ENAD and OPEN_ENAD logics.
Opening and closing operations
The opening and closing operations are available via communication, binary inputs or LHMI commands. As a prerequisite for control commands, there are enabling and blocking functionalities for both opening and closing commands (CLOSE_ENAD and OPEN_ENAD signals). If the control command is executed against the blocking or if the enabling of the corresponding command is not valid, CBXCBR generates an error message.
When close command is given from communication, via LHMI or activating the AU_CLOSE input, it is carried out (the EXE_CL output) only if CLOSE_ENAD is TRUE.
OPEN and CLOSE outputs
The EXE_OP output is activated when the open command is given (AU_OPEN, via communication or from LHMI) and OPEN_ENAD signal is TRUE. In addition, the protection trip commands can be routed through the CBXCBR function by using the TRIP input. When the TRIP input is TRUE, the EXE_OP output is activated immediately and bypassing all enabling or blocking conditions.
The EXE_CL output is activated when the close command is given (AU_CLOSE, via communication or from LHMI) and CLOSE_ENAD signal is TRUE. When the TRIP input is TRUE, CB closing is not allowed.
Opening and closing pulse widths
The pulse width type can be defined with the Adaptive pulse setting. The function provides two modes to characterize the opening and closing pulse widths. When the Adaptive pulse is set to "True", it causes a variable pulse width, which means that the output pulse is deactivated when the object state shows that the apparatus has entered the correct state. If apparatus fails to enter the correct state, the output pulse is deactivated after the set Operation timeout setting, and an error message is displayed. When the Adaptive pulse is set to "False", the functions always use the maximum pulse width, defined by the user-configurable Pulse length setting. The Pulse length setting is the same for both the opening and closing commands. When the apparatus already is in the right position, the maximum pulse length is given.
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 the 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.
The “status-only” mode means that control is not possible (non-controllable) via communication or from LHMI.
Local/Remote operations
The local/remote selection affects CBXCBR.
- Local: the opening and closing via communication is disabled.
- Remote: the opening and closing via LHMI is disabled.
- AU_OPEN and AU_CLOSE inputs function regardless of the local/remote selection.