Toshiba GR-200 Series Instruction Manual page 733

10.2.33 Aux. contacts monitoring (DPOS 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_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 "
monitoring application: Double position device function
Correspondence between CHK functions and applications
(i)
There are a number of CHK operates in the automatic supervision function; hence, the user is
required so that the control applications correspond with the CHK functions, as shown in Table
10.2-66.
Table 10.2-66 Correspondence table for the control applications
CHK functions
Function ID
229101
Error level
(ii)
For the operation, the user can set the error level when the function detects the error
concerning the operation. Generally, the default error level has been set at level 3 (Minor error)
and level 4 (Alarm) for the faulty state and the undefined state, respectively . However the
user can program them using settings. For example, when the user wish to program the fault
and undefined states in the DPOS01 function, use the settings [CHK_DPOS1:FLvl] and
[CHK_DPOS1:ULvl], respectively; then, set On for the setting [CHK_DPOS1:Sw].
starts to group the receiving signals into Open and the other states.
2
Technical description
(→p. 507).
Setup for BIO module
Names Function ID
CHK_DPOS
- 714 -
(→p. 470)" of Chapter
Control applications
DPOS01 function
DPOS02 function
512001 DPOS03 function
DPOS72 function
6F2T0200 (0.15)
1
Control and
(→p. 424).
Names
....
GRE200 (1,2)
of the