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14.8.1.1 Digital Input meanings
BI operates in transition between two statuses (e.g. High to low or low to high); for Open commands
it operates both on transition and status.
# Under Voltage Command
Close command from Remote
Open command from Remote
# CB Open Disabling
# CB Close Disabling
CB in Service position
CB in Test position
Line disconnector closed
Line disconnector open
Line disconnector closed to earth
Line disconnector operating rod
inserted
Earthing Switch open
Earthing Switch closed
Earthing Switch operating rod
inserted
Interlock Input 1
Interlock Input 2
# Local/Remote selection Key
Trip Signal and Anomaly Reset
Close command from Local
Open command from Local
Auxiliary Supply Monitoring
Second Safety Open command
Signal expected to be normally high; when it goes to low, an opening command is
executed if the Under Voltage function is activated.
Close command, only processed when control mode is Remote or Local and Remo-
te
Open Command, only processed when control mode is Remote or Local and Remo-
te
If CB Open Disabling function is ticked the CB will be locked in the closed position
when the DI is low and the LED on the local CB HMI is on
If CB Closing Disabling function is ticked the CB will be locked in the open position
when the DI is low and the LED on the local CB HMI is on
Status signal to acquire the CB truck position, in Service position when DI is high
Status signal to acquire the CB truck position, in Test position when DI is high
Status signal to acquire the three-position Line disconnector position, valid when DI
is high = closed (1)
Status signal to acquire the three-position Line disconnector position, valid when DI
is high = open
Status signal to acquire the three position Line disconnector position, valid when DI
is high = closed to earth
Status signal to acquire presence of Line disconnector operating rod, valid when DI
is high
Status signal to acquire the two-position cable side earth disconnector position, valid
when DI is high = open (1)
Status signal to acquire the two-position cable side earth disconnector position, valid
when DI is high = closed
Status signal to acquire presence of cable side earth disconnector operating rod,
valid when DI is high
Interlocking input, valid when DI is high. Blocks all protection functions linked to this
signal in Logic Configuration Tab
Interlocking input, valid when DI is high. Blocks all protection functions linked to this
signal in Logic Configuration Tab
Input to select control mode, control is set to: low = Local, high = Remote; if not
present, control is Local. When not enabled in the DI configuration (default) the
control mode is Local & Remote, i.e. Global. When the Panel HMI is present it is not
configurable, the same function is provided by the HMI Local/Remote selection key
Resets Trip signal condition (and DOs) and Anomaly condition (and blinking No
Anomaly LED on the local CB HMI), valid on transition from low to high
Close command, only processed when control mode is Local or Local and Remote
Open Command, only processed when control mode is Local or Local and Remote
DI to verify availability of aux supply, generally used to read a contact of the LV
circuit-breaker protecting the secondary panel cabinet. It generates an anomaly
when input goes from high to low (closing of auxiliary contact on LV CB opening). If
ticked, the information is replicated on DO (DO is closed after 5s from signal on DI
goes low).
HW opening commands, can override microprocessor malfunction and perform a
safety opening command of the CB when CB Open Disabling for Second Safety
Open function is not active (not ticked).
(1) Congruence of position
status read is verified
by the IED. If two posi-
tion status indications
go high or no position
status is high for a time
longer than the ex-
pected earthing switch
operating time, an
anomaly is issued.
89
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