MC2-30T
Doc. N°
MO-0483-ING
Copyright 2016
Date
17.03.2022
Rev.
2
Pag. 49
of
70
17.18 - Function:
IRF
(Internal Relay Fault)
In this menu it is possible to configurate the operation of the Relay Internal Fault detection element
Status
→
Enab.
No
[No / Yes]
Timers
→
tIRF
5.00
s
(5
÷
200)
step
0.01 s
17.18.1 - Description of variables
Enab.
: Function enabling (No = Disable / Yes = Enable)
tIRF
: Trip time delay
17.18.2 - Operation
Tripping of the function operates a user programmable output relay.
17.19 - Function:
BreakerFail
(Breaker Failure)
Status
→
Enab.
No
[No / Yes]
Timers
→
tBF
0.75
s
(0.05
÷
0.75)
step
0.01 s
17.19.1 - Description of variables
Enab.
: Function enabling (No = Disable / Yes = Enable)
tBF
: Trip time delay
17.19.2 - Operation
The Breaker Failure detection is started by the operation of the output relay “R1”, (programmed to be
controlled by the Protection Functions that trip the C/B).
If after [tBF] seconds from operation of the relay “R1”, any input current flow is still detected (>10% In),
the function “BF” trips and operate one user programmable output relay,
