Programmable Logic P54x/EN PL/La4
MiCOM P543, P544, P545 & P546
(PL) 7-25
PL
DDB no. English text Source Description
521 Aid 2 DEF Trip Aided Scheme Logic
Aided scheme 2 DEF trip command (output
from aided tripping logic)
522 Any Trip Trip Conversion Logic
Any trip signal - can be used as the trip
command in three-pole tripping applications
523 Trip Output A (CB1) Trip Conversion Logic
Trip signal for phase A - used as a command
to drive trip A output contact(s). Takes the
output from the internal trip conversion logic
524 Trip Output B (CB1) Trip Conversion Logic
Trip signal for phase B - used as a command
to drive trip B output contact(s). Takes the
output from the internal trip conversion logic
525 Trip Output C (CB1) Trip Conversion Logic
Trip signal for phase C - used as a command
to drive trip C output contact(s). Takes the
output from the internal trip conversion logic
526 Trip 3ph (CB1) Trip Conversion Logic 3 phase trip command
527 2/3 Ph Fault Trip Conversion Logic
2 or 3 phase fault indication - used to flag
whether the fault is polyphase. Typically used
to control auto-reclose logic, where auto-
reclosing is allowed only for single phase
faults
528 3 Ph Fault Trip Conversion Logic
3 phase fault indication. Typically used to
control auto-reclose logic, where auto-
reclosing is blocked for faults affecting all three
phases together
529 Trip Inputs 3Ph (CB1) PSL Trip 3 phase - input to trip latching logic
530 Trip Inputs A PSL
A phase trip - input to trip conversion logic.
Essential to ensure correct single or three pole
trip command results (e.g. converts a 2 pole
trip to 3 phase)
531 Trip Inputs B PSL
B phase trip - input to trip conversion logic.
Essential to ensure correct single or three pole
trip command results (e.g. converts a 2 pole
trip to 3 phase)
532 Trip Inputs C PSL
C phase trip - input to trip conversion logic.
Essential to ensure correct single or three pole
trip command results (e.g. converts a 2 pole
trip to 3 phase)
533 Force 3Pole Trip (CB1) PSL
Force any trip which is issued to always be 3
pole (trip conversion - used in single pole trip
applications, to signal when single pole
tripping and re-closing is either unwanted, or
impossible)
534
External Trip3ph (or CB1
Ext Trip3Ph)
PSL
External trip 3 phase - allows external
protection to initiate breaker fail, circuit breaker
condition monitoring statistics, and internal
auto-reclose (if enabled)
535
External Trip A (or CB1
Ext Trip A)
PSL
External trip A phase - allows external
protection to initiate breaker fail, circuit breaker
condition monitoring statistics, and internal
auto-reclose (if enabled)
536
External Trip B (or CB1 Ext
Trip B)
PSL
External trip B phase - allows external
protection to initiate breaker fail, circuit breaker
condition monitoring statistics, and internal
auto-reclose (if enabled)
537
External Trip C (or CB1 Ext
Trip C)
PSL
External trip C phase - allows external
protection to initiate breaker fail, circuit breaker
condition monitoring statistics, and internal
auto-reclose (if enabled)
538 CB2 Ext Trip3ph PSL
External trip 3 phase - allows external
protection to initiate breaker 2 fail
P544 and P546 only
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