Startco Engineering Ltd. Page 16
FPU-16 Feeder Protection Unit Rev. 1
Pub. FPU-16-M, November, 1997 Downloaded from the Internet, see Disclaimer.
Earth-Fault-CT-Primary Ratings:
EFCT-1 and EFCT-2................... 5 A
5-A- or 1-A-Secondary CT........... 50 A to 2000 A in 50-A increments
Default Value ........................................ 5 A (EFCT-1 or EFCT-2)
3.9 MODE 7 — PHASE-CT-PRIMARY RATING (I
p
)
This mode is used to enter the phase-CT-primary rating. All four digits are
displayed when the phase-CT primary rating is adjusted. When a new rating is
entered, the display returns to the three-value-digit format and the extended-
range notation applies for values above 999 A. See Section 2.2.
If I
p
is greater than 1200 A or if I
n
is greater than 800 A, enter 0.1 x I
p
and multiply
readings in Modes A, b, and C by 10.
Phase CT’s should be selected so that rated current is approximately 70% of the
primary rating. The rated-current programming range in Mode 8 is 45% to 93%
of the phase-CT-primary rating. Mode 7 must be programmed before Mode 8
because Mode 8 is set to the bottom of the rated-current range when the phase-
CT-primary rating is entered.
CT-Primary-Rating Range ..................... 20 A to 1200 A in 5-A increments
Default Value ........................................ 150 A
3.10 MODE 8 — RATED CURRENT (I
n
)
This mode is used to enter rated current (I
n
) and to indicate the firmware revision
level. Rated-current range is a function of the phase-CT-primary rating entered
in Mode 7. It is necessary to enter I
p
in Mode 7 before I
n
is entered in Mode 8
because Mode 8 is set to the minimum value of the I
n
range when I
p
is entered.
The firmware revision level is displayed by pressing ENTER.
If I
p
is greater than 1200 A or if I
n
is greater than 800 A, enter 0.1 x I
n
and multiply
readings in Modes A, b, and C by 10.
Set-Point Range.................................... 9 A to 800 A
Set-Point Step Size............................... 1 A
Rated-Current Range............................ 0.45 to 0.93 x I
p
Default Value ........................................ 100 A
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