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10.2.34 Aux. contacts monitoring (DPSY/DOPS faulty or undefined)
When signals of an external device (i.e., a circuit breaker) are provided in a pair of auxiliary
contacts
, the signals may be grouped into four states: Open, Fault, Undefined, and Closed.
1
This is because, two different kinds of N/C and N/O contacts operates in the other way around;
hence, there is a possibility that the generated signal may have an incorrect condition (Faulty)
or an intermediate condition (Undefined). When receiving the signal by the BI circuit
IED, a preliminary logic
Consequently, the control function is able to operate securely not being affected by improper
signals (i.e., Fault, Undefined). In the supervision function, the received signals are sorted
with the definition of the error levels programmed by the manufacture, but the user can
program the sorting procedure arbitrarily using the settings in CHK functions
(CHK_DPOSSYN and CHK_DPOS).
Note: The BI circuit is discussed in the Binary IO module. For more information, see
1
Chapter
Note: The preliminary logic is designed to acquire a signal coming from the BI circuit
2
and to sort the signal into the 'Open', 'Fault', 'Undefined', and 'Closed' states. The
preliminary logic is furnished in every control functions. For example, we can find
the logic in section "
application: Double position controller with synchronizing-checking
Correspondence between CHK functions and applications
(i)
There are a number of CHK operations in the automatic supervision function; hence, the user
is required so that the control applications correspond with the CHK functions, as shown in
Table 10.2-68.
Table 10.2-68 Correspondence table for the control applications
CHK functions
Function ID
229001
229101
†Note: To detect the "Faulty" and "Undefined" states in the DPSY01 function, the user
can adjust the time for supervision using settings [DPSY01-FLTTIM] and
[DPSY01-UDFTIM], each of which is accommodated in the DPSY1 function. Then,
set [DPSY01-FLTEN] On for the operation. Likewise, settings are available in the
DPSY02 function.
Error level
(ii)
For the operation, the user can set the error level when the function detects the error
starts to group the receiving signals into Open and the other states.
2
Technical description
.
Setup for BIO module
Names
Function ID
CHK_DPOSSYN
CHK_DPOS
- 837 -
Control and monitoring
" in Chapter
Control applications
DPSY01 function†
511001
DPSY02 function†
DPOS01 function
DPOS02 function
512001
DPOS03 function
DPOS72 function
6F2T0207 (0.01)
1
.
Names
....
GRE200 (5,6)
of the
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