Page 4-2
FPU-32 Feeder Protection Unit
Rev.
2-A-103014
Operation and Setup
4.1.2 R
EAR-
P
ANEL
LED I
NDICATION
The three LED’s on the rear panel are labeled ER, MS,
and NS. The red ER (Error) LED is OFF during normal
operation and is ON when there is a processor error or
during firmware-update operation. Output relays are de-
energized when this LED is ON. The MS (Module Status)
and NS (Network Status) LED’s are used for network-
communications and firmware-update annunciation. The
specific colour and function of these LED’s is defined by
the network-communications option installed in the
FPU-32. For detailed information, see the applicable
communications manual.
4.1.3 D
ISPLAY
C
ONTRAST AND
T
EST
Contrast control and operator-interface test features
are available when the display is in Local mode. To
prevent a
Display Comm Trip
, select
Disabled
in the
Setup
Hardware
OPI Display
Trip Action
menu.
To enter Local mode, press the up-arrow, right-arrow,
and ENTER keys simultaneously.
In Local mode, all face-plate LED’s are ON and the
display indicates three menu items;
Contrast
,
Address
,
and
Enter Test Mode
. Use the up- and down-arrow keys
to select the menu item.
Contrast
: Use the right- and left-arrow keys to
increase or decrease contrast.
Address
: The display address indicates 1 and cannot
be changed.
Enter Test Mode
: Press the right-arrow key to enter
test mode. In test mode, the LED test, Display test, and
Display-Heater test are automatically performed. The
Interactive-Key test is then entered and the following
symbols are displayed when a key is pressed.
Left Key:
¬
Right Key:
Ñ
Up Key:
«
Down Key:
½
ESC: ^
ENTER:
ª
RESET:
Press RESET to exit this menu.
Press the ESC key to exit Local mode and return to the
FPU-32 menu. Re-enable
OPI Diplay Trip Action
.
4.2 S
ETUP
Certain FPU-32 settings cannot be changed when
current is detected. See Appendix B.
4.2.1 P
HASE
-CT I
NPUTS
Menu:
Setup
|
System Ratings
|
CT Primary
The CT-primary setting range is 1 to 5,000 A. To
maintain specified accuracy, phase CT’s should be
selected with a primary rating between 100 and 300% of
rated current.
For A-B-C sequence, the +Seq I
1
display value is
larger than the –Seq I
2
display value and positive current
unbalance is indicated. Negative current unbalance will
be indicated if the phase sequence is B-A-C. If negative
unbalance is indicated, correct the phase-CT
connections. Severe current unbalance may be indicated
when phase-CT polarity is incorrect.
4.2.2 E
ARTH
-F
AULT
-CT I
NPUT
Menu:
Setup
|
System Ratings
|
EF-CT Primary
The earth-fault-CT-primary setting range is 1 to
5,000 A. The EF-CT-primary rating is 5 A for sensitive
CT’s
EFCT-1 and EFCT-2.
EF-CT Primary
should be
set equal to
CT Primary
for residual CT connections.
The protection setting range for the EF-CT connection is
equal to the EF-CT-primary rating.
The FPU-32 also supports earth-fault protection based
on the calculated zero-sequence component (3I
0
). The
protection setting range for the 3I
0
connection is fifteen
times the phase-CT-primary rating.
N
OTE:
Calculated 3I
0
does not detect CT saturation.
Enable overcurrent protection when earth-fault current
can exceed 15 times the phase-CT-primary rating.
4.2.3 F
REQUENCY
Menu:
Setup
|
System Ratings
|
Frequency
Set
Frequency
at 50 or 60 Hz.
4.2.4 S
ET-
P
OINT
G
ROUP
Menu:
Setup
|
System Ratings
|
Set-Point Group
The FPU-32 supports two set-point groups. The
Setup
System Ratings
Set-Point Group
menu specifies the
active set-point group as Group1 or Group2. If the
digital input is used to select the set-point group, it has
priority over the menu setting.
4.2.5 O
UTPUT
R
ELAY
A
SSIGNMENT
Menu:
Setup
|
Relay Outputs
|
Relay x
Menu:
Setup
|
Relay Outputs
|
RY Pulse Time
Each of the three output relays can be assigned to one
of the functions listed in Table 4.2. More than one relay
can be assigned the same function. Trip and alarm
assignments operate in the selected fail-safe or non-fail-
safe mode.
The default assignment for Relay 1 is Trip1, for
Relay 2 is Alarm1, and for Relay 3 is None. This
assignment is compatible with the FPU-16 Feeder
Protection Unit. The default mode setting for all three
relays is Fail-Safe.
Содержание FPU-32
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