1. FEEDER PROTECTION UNIT
FPU-16
FEEDER PROTECTION UNIT

2. THE FPU-16 FEEDER PROTECTION UNIT
The FPU-16 is a microprocessor-based feeder protection unit with programmable trip-and-alarm set points for phase protection, ground-fault protection, and current unbalance. Features of the FPU-16 include an operation counter, front-panel programming, independent trip-and-alarm relays, and an isolated analog output.

3. FPU-16 FEEDER PROTECTION UNIT
Compact design-1/4 DIN
size
Temperature rating of
-40°C to 60°C
Panel or surface mount
Supply voltage range of 85
to 135 Vac
Program-change lockout

4. FPU-16 FEEDER PROTECTION UNIT
Separate trip and alarm
contacts
- Fused
- Form “C”
- Fail-safe or non-fail-
safe operation
Plug-in terminal blocks

5. WHAT PROTECTION DOES AN FPU-16 OFFER?
THERMAL OVERLOAD
SHORT-TIME OVERCURRENT
INSTANTANEOUS OVERCURRENT
CURRENT UNBALANCE
EARTH-FAULT
RAMP
MODE
RESET
ENTER
SET POINT MOD
STATUS MODES
FPU-16
FEEDER PROTECTION UNIT

6. OPTIONAL ELECTROLUMINESCENT BACKLIT DISPLAY
FPU-16 FACE PLATE
LIQUID CRYSTAL DISPLAY
MODE digit identifies mode
VALUE digits Display set points, trip and alarm codes, and meter readings
TRIP/ALARM, Red LED
On: Trip or alarm
Flashing: Program-change lockout defeated
PROCESSOR, Green LED Indicator On: Processor functional
OPTIONAL ELECTROLUMINESCENT BACKLIT DISPLAY
MODE LIST
MEMBRANE SWITCH KEYPAD
RAMP switch
Adjusts value digits
ENTER switch Enters values, accesses alarm set points and values at trip
MODE switch
Selects modes “0” through “F”
RESET switch
Resets trips and alarms

7. FPU-16 BACK PLATE - + 13 14 15 16 A B C O M 17 18 19 20 P E 21 22 2324 F - +
CNTR
ICT
SHIELD 12 11 10 9 8 7 6 5 4 3 2 1 L1 L2 F2 8A F1
ANALOG NC I
26 25
RS 485
TRIP
ALARM
L1 and L2 - are for control power. Units can be ordered with optional 120 Vac or 240 Vac and 50 or 60 Hz. There is also an optional DC power supply.
are the form “C” trip relay. It is 10 A rated and fused at 8 A. Relays can be configured to operate in the fail-safe or non-fail-safe mode.
8 - System ground
9 - Key Pin. High voltage lower block cannot be plugged into low voltage upper terminals.
Form “C” alarm relay.
isolated analog output or RS-485.
Input for Earth-fault CT.
Program enable. These pins must be connected to allow
program changes.
Input for RTD or Thermistor.
ICT-2 Interface CT input. ICT-2 shown on the next slide.

8. ICT-2 INTERFACE CT Provides mounting flexibility Mounting ICT-2 close
to CT’s provides:
- Less signal loss Eliminates open CT
hazard

9. FPU-16 TYPICAL APPLICATION
EARTH-FAULT CT
PHASE CT'S
SUPPLY
LOAD 12 11 10 9 8 1 5 S R 7 6 4 3 2
ICT-2 13 14 15 16 A B C O M E F 18 19 17 Y X 20 21 22 23 24 25 26 27
MPU
PHASE C CT
PHASE A CT
PHASE B CT
EARTH FAULT
ANALOG OR RS-485 OUTPUT 13 14 15 16 17 18 19 20 21 22 23 24 A B C C N C P E - + M O C E
CNTR
ANALOG/RS-485 OUTPUT F
ICT
SHIELD
FPU-16
ALARM
TRIP F2 N F1 L2 L1 C 12 11 10 9 8 7 6 5 4 3 2 1 N L
TO TRIP COIL OR LOCKOUT RELAY
ALARM A

10. I2t THERMAL PROTECTION CURVE
10000
8000
PERCENT I2t
6000
DYNAMIC LIMIT
5000
100
4000
3000
PERCENT I2 t
2000 50
1000
800
600
500
0.5
1.0
400
MULTIPLES OF RATED CURRENT
300
200
CLASS 20
SECONDS
100 80 60 50 40 30
CLASS RANGE
1 s TO 45 s AT 600%
0% I2t 20
25% I2t
50% I2t 10 8 6 5 4
75% I2t 3 2 1 1 2 3 4 5 6 7 8 9 10 11 12
MULTIPLES OF RATED CURRENT

11. SHORT-TIME OVERCURRENT SETTINGS
MAXIMUM
9x PHASE CT PRIMARY RATING
FEEDER CURRENT
TRIP SET POINT
TRIP TIME = 3, 6, 12, OR 24 CYCLES
ALARM SET POINT
ALARM TIME = 3, 6, 12, OR 24 CYCLES
1x PHASE CT PRIMARY RATING
MINIMUM

12. INSTANTANEOUS OVERCURRENT SET-POINT RANGE
MAXIMUM
9x PHASE CT PRIMARY RATING
TRIP SET POINT
TRIP TIME =0.25 TO 3 CYCLES
FEEDER CURRENT
ALARM SET POINT
ALARM TIME = 0.25 TO 3 CYCLES
1x PHASE CT PRIMARY RATING
MINIMUM

13. CURRENT UNBALANCE SET-POINT RANGE
75%
MAXIMUM
PERCENT CURRENT UNBALANCE
TRIP SET POINT
TRIP TIME =5 SECONDS
ALARM SET POINT
ALARM TIME = 1 SECOND 5%
MINIMUM

14. EARTH-FAULT CURRENT SET-POINT RANGE
100%
of CT-primary rating
MAXIMUM
EARTH-FAULT CURRENT
TRIP SET POINT TRIP TIME=3, 6, 12, OR 24 CYCLES
ALARM SET POINT ALARM TIME = 12 CYCLES 1%
of CT-primary rating
MINIMUM

15. FPU-16 SETUP MODES MODE 6: EARTH-FAULT-CT-PRIMARY RATING (Ie)
Range: 5 A to 2000 A
MODE 7: PHASE-CT-PRIMARY RATING (Ip)
Range: 20 A to 1200 A
MODE 8: RATED CURRENT (In)
Range: 9 A to 800 A

16. MODE 5-PROGRAMMABLE OPTIONS
SHORT-CIRCUIT TRIP TIME: 3, 6, 12, or 24 cycles
EARTH-FAULT TRIP TIME: 3, 6, 12, or 24 cycles
I2t IMMEDIATE RESET: on / off
ALARM LATCH: on / off
AUTORESET (MODE 0): on / off
RELAY OPERATING MODE:
TRIP RELAY: fail safe / non fail safe
ALARM RELAY: fail safe / non fail safe
ANALOG OUTPUT PARAMETER:
current, I2t, earth leakage

17. METERING MODES MODES A, b, AND C: AMMETERS
<ENTER> displays pre-trip value
MODE d: PERCENT I2t, TIME-TO-RESET, EMERGENCY THERMAL RESET
MODE 9: PERCENT UNBALANCE
<ENTER> displays pre-trip value
MODE E: EARTH LEAKAGE
<ENTER> displays pre-trip value
MODE F: OPERATION COUNTER

18. OPTIONS AVAILABLE FOR THE FPU-16
MOUNTING: Panel or surface
POWER SUPPLY:
AC: 120 Vac, 240 Vac, or 120/240 Vac switch selectable
DC: 12 Vdc, 24 Vdc, or 48 Vdc
FREQUENCY: 50 or 60 Hz
SIGNAL OUTPUT CONFIGURATION:
ANALOG: 4-20 mA, 0-5 Vdc, 0-10 Vdc
COMMUNICATIONS: RS-485 A-B or Modicon protocols
(data logging available)
DUAL OUTPUT: Analog and RS-485 available
ELECTROLUMINESCENT BACKLIT DISPLAY
REMOTE-KEYPAD INPUT

19. RS-232 TO RS-485 CONVERTER (485CSP2)
FPU-16 COMMUNICATIONS 23 24
RAMP
MODE
RESET
ENTER
FEEDER PROTECTION UNIT
SET POINT MODES
STATUS MODES
STARTCO
FPU-16
SE-485
T(A)
T(B)
R(A)
R(B)
SE-TA485
FR. GND
TD(B)
TD(A)
RD(A)
RD(B)
+12VDC
GND
WHT
BLK
RTS SD ON
OFF
CONTROL
ECHO
TD ENABLE RD
RS-232 TO RS-485 CONVERTER (485CSP2)
RS-485
RS-232
DC POWER SUPPLY
SHIELD 23 24
FEEDER PROTECTION UNIT
1 TO 63 FPU-16’s or
MPU-16A’s
SET POINT MODES
STATUS MODES
RAMP
MODE
RESET
ENTER
STARTCO
FPU-16 23 24
FEEDER PROTECTION UNIT
SE-485
SET POINT MODES
STATUS MODES
RAMP
MODE
RESET
ENTER
STARTCO
FPU-16 23 24
FEEDER PROTECTION UNIT
SE-TA485
SET POINT MODES
STATUS MODES
RS 232
RAMP
MODE
RESET
ENTER
STARTCO
FPU-16