Littelfuse Startco FPU-32 User manual

3714 Kinnear Place Saskatoon, SK Canada S7P 0A6 Ph: [phone] Fx: [phone] www.littelfuse.com/relayscontrols
FPU-32 MANUAL
FEEDER PROTECTION UNIT
Revision 2-A-103014
TRIP
ALARM
ACTIVE
UPI
RESET ENTER
ESC
FEEDER PROTECTION UNIT FPU-32
LITTELFUSE STARTCO
MAIN MENU
Metering Ñ
²Messages Ñ
Setup Ñ
Copyright 2014 by Littelfuse Startco
All rights reserved.
Document Number: PM-1115-EN
Printed in Canada.

Factory default password is 1111
New Password
See Section 4.5
Feeder Identification

Page i
FPU-32 Feeder Protection Unit Rev. 2-A-103014
Table of Contents
TABLE OF CONTENTS
SECTION PAGE
List of Figures.........................................................................ii
List of Tables..........................................................................ii
1 Introduction ..........................................................1-1
1.1 General.....................................................................1-1
1.2 FPU-32 Features......................................................1-1
1.2.1 Protection.....................................................1-1
1.2.2 Metering.......................................................1-1
1.2.3 Data Logging...............................................1-1
1.2.4 Inputs and Outputs......................................1-1
1.2.5 Operator Interface .......................................1-1
1.2.6 Communications .........................................1-1
1.3 Ordering Information..............................................1-3
2 Installation..............................................................2-1
2.1 General.....................................................................2-1
2.2 FPU-32 Feeder Protection Unit..............................2-1
2.3 MPU-CIM Current Input Module..........................2-1
2.4 Earth-Fault CT’s......................................................2-1
2.5 FPU-32/FPU-16 Compatibility ..............................2-1
3 System Wiring .......................................................3-1
3.1 General.....................................................................3-1
3.2 Wiring Connections ................................................3-2
3.2.1 FPU-32 Connections....................................3-2
3.2.1.1 Supply Voltage...............................3-2
3.2.1.2 CIM Input.......................................3-2
3.2.1.3 Digital Input...................................3-2
3.2.1.4 Analog Output................................3-2
3.2.1.5 PTC or RTD Input.........................3-2
3.2.1.6 I/O Module Communications........3-2
3.2.1.7 RS/EIA/TIA-232
Communications...........................3-3
3.2.2 MPU-CIM Connections..............................3-3
3.2.2.1 Standard.........................................3-4
3.2.2.2 Residual Earth-Fault.....................3-4
3.2.2.3 Two-CT.........................................3-4
3.2.3 Cable Restraint............................................3-6
3.2.4 Dielectric-Strength Testing.....................3-6
4 Operation and Setup.............................................4-1
4.1 Display and Indication ............................................4-1
4.1.1 Front-Panel LED Indication .......................4-1
4.1.2 Rear-Panel LED Indication.........................4-2
4.1.3 Display Contrast and Test...........................4-2
4.2 Setup .......................................................................4-2
4.2.1 Phase-CT Inputs..........................................4-2
4.2.2 Earth-Fault-CT Input...................................4-2
4.2.3 Frequency....................................................4-2
4.2.4 Set-Point Group...........................................4-2
4.2.5 Output Relay Assignment...........................4-2
4.2.6 Digital Input.................................................4-3
4.2.7 Analog Output.............................................4-3
4.2.8 Miscellaneous Configuration......................4-4
4.2.9 Communications .........................................4-4
4.3 Metering.............................................................4-4
SECTION PAGE
4.4 Messages................................................................. 4-5
4.4.1 Trip Reset.................................................... 4-5
4.4.2 Data Logging.............................................. 4-5
4.4.3 Statistical Data............................................ 4-5
4.4.4 Emergency Thermal Reset......................... 4-5
4.5 Password Entry and Programming.....................4-5
5 Protective Functions.........................................5-1
5.1 General...............................................................5-1
5.2 Overload.............................................................5-1
5.2.1 I2t Protection ...........................................5-1
5.2.2 Emergency Thermal Reset......................5-2
5.3 Inverse-Time Overcurrent..................................5-2
5.4 Definite-Time Overcurrent...............................5-12
5.5 Inverse-Time 3I0Earth Fault............................5-12
5.6 Definite-Time 3I0Earth Fault...........................5-12
5.7 Definite-Time Earth Fault................................5-13
5.8 Current Unbalance............................................5-13
5.9 Phase Loss........................................................5-13
5.10 Phase Reverse...................................................5-13
5.11 PTC Temperature.............................................5-13
5.12 RTD Temperature ............................................5-14
6 Theory of Operation.........................................6-1
6.1 Signal-Processing Algorithms............................6-1
7 Communications...............................................7-1
7.1 Personal-Computer Interface..............................7-1
7.1.1 Firmware Upgrade ..................................7-1
7.1.2 SE-Comm-RIS ........................................7-1
7.2 Network Interface...............................................7-1
7.2.1 TIA-485 Option.......................................7-1
7.2.2 DeviceNet Option ...................................7-1
7.2.3 Ethernet Option.......................................7-1
8 Technical Specifications...................................8-1
8.1 FPU-32...............................................................8-1
8.2 Current Input Module (MPU-CIM)....................8-3
9 Warranty...........................................................9-1
Appendix A FPU-32 Menu Map................................A-1
Appendix B FPU-32 Set-Up Record..........................B-1
Appendix C FPU-32 TIA-232 Modbus Protocol......C-1
Appendix D Communications Database Table........D-1
Appendix E Register Formats................................... E-1
Appendix F Ground-Fault Performance Test.......... F-1
Appendix G FPU-32 Revision History......................G-1

Page ii
FPU-32 Feeder Protection Unit Rev. 2-A-103014
Table of Contents
LIST OF FIGURES
FIGURE PAGE
1.1 Feeder Protection Unit Block Diagram..................1-2
1.2 FPU-32 Ordering Information................................1-3
2.1 FPU-32 Outline and Panel-Mounting Details........2-2
2.2 FPU-32 Outline and Surface-Mounting Details ....2-3
2.3 MPU-CIM Outline and Mounting Details.............2-4
2.4 EFCT-1 Outline and Mounting Details..................2-5
2.5 EFCT-2 Outline and Mounting Details..................2-6
2.6 EFCT-26 Outline and Mounting Details................2-7
3.1 Typical FPU-32 Connection Diagram ...................3-1
3.2 Analog-Output Connections...................................3-2
3.3 Temperature-Sensor Connections ..........................3-2
3.4 I/O Module Connection Diagram...........................3-2
3.5 MPU-CIM Schematic.............................................3-3
3.6 MPU-CIM Standard Connections..........................3-4
3.7 Other MPU-CIM Connections ...............................3-5
4.1 Menu Example ........................................................4-1
4.2 Menu Symbols.........................................................4-1
5.1 I2t Overload Cold Curves........................................5-3
5.2 IEC Normal Inverse, Curve Type A.......................5-4
5.3 IEC Very Inverse, Curve Type B...........................5-5
5.4 IEC Extreme Inverse, Curve Type C .....................5-6
5.5 IEC Short Inverse, Curve Type A ..........................5-7
5.6 IEC Long Inverse, Curve Type B...........................5-8
5.7 IEEE Moderate Inverse Curves..............................5-9
5.8 IEEE Very Inverse Curves....................................5-10
5.9 IEEE Extreme Inverse Curves..............................5-11
5.10 Asymmetrical-Current Multipliers.......................5-12
LIST OF TABLES
TABLE PAGE
3.1 CA-945 Adapter......................................................3-3
4.1 UPI LED Functions.................................................4-1
4.2 Output-Relay Functions..........................................4-3
4.3 Digital-Input Functions...........................................4-3
4.4 Analog-Output Parameters .....................................4-4
4.5 Metering Display.....................................................4-4
5.1 Curve Types.............................................................5-2
5.2 Fault Duration Required for Trip..........................5-12
DISCLAIMER
Specifications are subject to change without notice.
Littelfuse Startco is not liable for contingent or
consequential damages, or for expenses sustained as a
result of incorrect application, incorrect adjustment, or a
malfunction.

Page 1-1
FPU-32 Feeder Protection Unit Rev. 2-A-103014
Introduction
1. INTRODUCTION
1.1 GENERAL
The FPU-32 is a feeder protection relay that provides
integrated protection, metering, and data-logging
functions. The FPU-32 can be programmed using the
front-panel operator interface, the TIA-232 port, or an
optional communications network.
1.2 FPU-32 FEATURES
1.2.1 PROTECTION
Overload (49, 51)
Definite-time overcurrent (50, 51)
Inverse-time overcurrent (50, 51, IEC and IEEE)
Definite-time earth fault (50G/N, 51G/N)
Inverse-time earth fault
(50G/N, 51G/N, IEC and IEEE)
Unbalance (46)
Phase loss (46)
Phase reverse (46)
PTC overtemperature (26, 49)
RTD temperature (26, 49)
Two set-point groups
1.2.2 METERING
Line currents
Current unbalance
Positive-sequence current (I1)
Negative-sequence current (I2)
Zero-sequence current (3I0, calculated)
Earth-leakage current (CT input)
Used thermal capacity
Thermal trend
RTD temperature
1.2.3 DATA LOGGING
One-hundred records
Date and time of event
Event type
Cause of trip
Line currents
Current unbalance
Earth-leakage current
Used thermal capacity
RTD temperature
Trip counters
Running hours
1.2.4 INPUTS AND OUTPUTS
Phase current inputs
Earth-leakage-current input
Programmable digital input (24 Vdc)
24-Vdc source for digital input
4-20-mA analog output, programmable
Temperature-sensor input, Pt100 RTD or PTC
I/O module interface
Three output relays, programmable
TIA-232 communications
Network communications
1.2.5 OPERATOR INTERFACE
4 x 20 backlit LCD display
Display-control and programming keys
LED status indication
1.2.6 COMMUNICATIONS
The standard communications interface is a TIA-232
port using the ModbusRTU protocol. In addition to the
standard interface, network communications options
include TIA-485 with both ModbusRTU and A-BDF1
protocols, DeviceNetTM, and an IEEE 802.3 port with
ModbusTCP Ethernet protocol.

Page 1-2
FPU-32 Feeder Protection Unit Rev. 2-A-103014
Introduction
+
-
-
+
24 V DC
DIGITAL
INPUT
26
25
1
2
3
4
5
6
7
8
DCD
DTR
SG
RD
TD
CTS
RTS
KEYPAD:
UP
DOWN
LEFT
RIGHT
RESET
ESC
ENTER
L
S
ANALOG OUTPUT
SELF/LOOP
POWER SELECTOR
23
24
AB
AA
4-20 mA
ANALOG
OUTPUT
DISPLAY:
4 x 20 ALPHANUMERIC LCD,
LED BACKLIGHTING
ON
REAR
PANEL
ER (FPU-32 ERROR)
MS (MODULE STATUS)
NS (NETWORK STATUS)
UPI (USER PROG INDICATOR)
RUN
ALARM
TRIP
LED INDICATORS:
FPU-32 MPU-CIM
CURRENT
INPUT
MODULE
13
14
15
16
18
17
19
20
21
22
23
24
25
26
27
EF1
Y
X
E
S
5
R
1
12
11
10
9
1
5
S
R
8
7
6
5
1
5
S
R
4
3
2
1
1
5
S
R
PHASE CT
PHASE CT
PHASE CT
CONFIGURATION
SELECTION
EARTH FAULT CT
SUPPLY
L1
L2
2
3
8
PTC/RTD
INPUT
TA
TB
17
18
19
11 12 10 194675
OUTPUT
RELAY 2
OUTPUT
RELAY 3
OUTPUT
RELAY 1
OUTPUT RELAY CONTACTS SHOWN
WITH FPU-32 DE-ENERGIZED.
DCE
TIA-232
I/O MODULE
INTERFACE
27
28
29
30
31
0V
+24V
13
14
15
16
29
22
21
20
A
B
C
COM
EF
NC
OPTIONAL
NETWORK COM
TC
FIGURE 1.1 Feeder Protection Unit Block Diagram.

Page 1-3
FPU-32 Feeder Protection Unit Rev. 2-A-103014
Introduction
1.3 ORDERING INFORMATION
See Fig. 1.2 for FPU-32 and MPU-CIM model
numbers.
TRIP
ALARM
ACTIVE
UPI
RESET ENTER
ESC
FEEDER PROTECTION UNIT FPU-32
LITTELFUSE STARTCO
-
-
Options:
00 CIM Input
(1)
Network Communications:
0 None,TIA-232 only
1 TIA-485 c/w A-B
®
DF1 &
Modbus
®
RTU Protocols
2 DeviceNet™
4 IEEE 802.3 (Ethernet)
Power Supply:
0 Universal ac/dc
(65 to 265 Vac and
80 to 275 Vdc)
(1)
Requires input from MPU-CIM or MPU-16A ICT-x
FPU-32-
Future Options:
00 No Options
Configuration:
00 50/60 Hz
MPU-CIM-
Supplied Interconnect Cable:
S75-M16A-20032 MPU-CIM to MPU-32 Interconnect Cable,
6 m (19’) Included with MPU-CIM
MAIN MENU
Metering Ñ
²Messages Ñ
Setup Ñ
1
R
2
S
3
5
4
1
5
R
6
S
7
5
8
1
9
R
10
S
11
5
12
1
PHASE A
EARTH FAULT
PHASE B PHASE C
CURRENT INPUT MODULE
MPU-CIM
27
1
26
R
25
5
24
S
23
E
22 21
X
20
Y
19
E
F
1
18 17
E
F
2
16
C
O
M
15
C
14
B
13
A
MPU
FIGURE 1.2 FPU-32 Ordering Information.
Current Transformers:
EFCT-1.........................Earth-Fault CT,
5-A-primary rating,
82 mm (3.2”) window
EFCT-1FC.................... Flux Conditioner for EFCT-1,
70 mm (2.7”) window
EFCT-2.........................Earth-Fault CT with
Flux Conditioner, 5-A-primary
rating, 139 mm (5.5”) window
EFCT-26....................... Earth-Fault CT,
5-A-primary rating,
26 mm (1”) window
Other Earth-Fault CT’s .. Contact factory
Phase CT’s.................... Contact factory
Accessories:
MPU-32-SMK ..............Surface-mounting hardware
kit
MPU-16A-Y92A-96N ..Watertight faceplate cover
CA-945 .........................DB9 to RJ-45 Adapter with
1.5 m (5’) cable
SE-ICUSB232...............USB to TIA-232 serial
converter
Software:
SE-Comm-RIS..............PC Interface
(1)
SE-Flash........................Firmware Upgrade
(1)
(1) Available at www.littelfuse.com/relayscontrols.

Page 1-4
FPU-32 Feeder Protection Unit Rev. 2-A-103014
Introduction
This page intentionally left blank.

Page 2-1
FPU-32 Feeder Protection Unit Rev. 2-A-103014
Installation
2. INSTALLATION
2.1 GENERAL
A basic system consists of an FPU-32, an MPU-CIM,
and three 1-A- or 5-A-secondary line-current transformers.
Earth-fault protection can be provided from a core-balance
CT or from phase CT’s. A core-balance CT (1-A, 5-A, or
EFCT series) is recommended. A single PTC/RTD input is
provided on the FPU-32.
The FPU-32 switch-mode power supply is rated 65 to
265 Vac and 80 to 275 Vdc.
All modules can be mounted in any orientation.
2.2 FPU-32 FEEDER PROTECTION UNIT
Outline and details for FPU-32 panel-mounting are
shown in Fig. 2.1. The FPU-32 mounts in a 92-mm
(3.62”), ¼ DIN, square cutout and is secured by a
panel-mount clamp. Insert the FPU-32 through the panel
cutout and slip the panel-mount clamp over the FPU-32
body. Slide the clamp forward until the latch tabs snap
into the mating holes. Lock the unit in place by
tightening the four clamp screws against the panel.
CAUTION: Do not over tighten the clamp screws as this
may deform the clamp and release the latch tabs.
Outline and details for FPU-32 surface-mounting are
shown in Fig. 2.2. Ensure that the L/S switch is set before
installing surface-mounting brackets. See Section 3.2.1.4
for switch positions. A detailed installation instruction
sheet is included with the MPU-32-SMK Surface-
Mounting Hardware Kit.
2.3 MPU-CIM CURRENT INPUT MODULE
The MPU-CIM can be surface or DIN-rail mounted.
Outline and mounting details are shown in Fig. 2.3. To
minimize CT-lead burden, an MPU-CIM can be located
close to the CT’s. The MPU-CIM terminates phase- and
earth-fault-CT secondariesshorting blocks are not
required for MPU-CIM outputs.
2.4 EARTH-FAULT CT’S
Outline and mounting details for the EFCT-1, EFCT-2,
and EFCT-26 are shown in Figs. 2.4, 2.5 and 2.6.
2.5 FPU-32/FPU-16 COMPATIBILITY
The FPU-32 is hardware compatible with existing
FPU-16 installations, except that it has a temperature
sensor input and does not include an operations counter.
An FPU-32 can replace an FPU-16 with minimal wiring
changes. I/O connections to FPU-16 terminals 13 to 16
and 21 to 24 are identical to those on the FPU-32 and
should be transferred to the plug-in terminal blocks
supplied with the FPU-32. If a switch was connected to
the FPU-16 program-enable terminal 21 and a hard-wired
program enable is required, it can be implemented using
digital-input terminals 25 and 26 as outlined in Section
4.2.6. A hard-wired program enable is often not required
since the FPU-32 set points are password protected. If the
FPU-16 analog output was used, ensure that the FPU-32
analog output switch is set to the ‘S’ (Self Powered)
position.
Although FPU-32 terminals 1 to 12 have been
rearranged to provide a third relay output (terminals 1, 4,
and 9), the FPU-16 lower terminal block can be safely
plugged into the equivalent FPU-32 terminal locations.
CAUTION: The keying plug installed in position 9 of the
FPU-16 lower terminal block must be removed before the
terminal block can be plugged into an FPU-32. Use a
dental pick, awl, or similar pointed tool to remove the
keying plug. If the keying plug is difficult to remove, use
the terminal blocks supplied with the FPU-32.
A TERMINAL BLOCK WITH A KEYING PLUG WILL
DAMAGE THE FPU-32.
If the FPU-32 does not power up, ensure that L1 is
connected to terminal 2 (not terminal 1) and L2/N is
connected to terminal 3 (not terminal 4). If the duplicate
L1 and L2 terminals on the FPU-16 are used to power
another device, disconnect the outgoing L1 and L2 leads
and power the next device directly from the power source.
This change is in compliance with current codes that do
not permit daisy chaining power connections at plug-in
terminals. FPU-32 default relay assignment is the same
as the FPU-16 trip- and alarm-relay configuration.
For additional information see www.littelfuse.com/
relayscontrols and refer to Technical Note FP-02
Replacing an FPU-16 with an FPU-32.

Page 2-2
FPU-32 Feeder Protection Unit Rev. 2-A-103014
Installation
E
RM SN S
13 15 1714 16
AB C
O
M
C
CIM
18 19
T
AT BT C
TEMP AN OUT
20 2321 E
FA BA ALS
24 22
12111098765432 1
L
1
L
2
/
N
RELAY 1
RELAY 3
RELAY 2
31 29 2730 28
2
4
V
S
H0 V
26 25
DIG IN
I/O MODULE
COMM
TIA-232 ONLY
91.1
(3.59)
132.0
(5.20)
LATCH TAB
CLAMP SCREWS
PANEL-MOUNT CLAMP
PANELTHICKNESS
1.6 (0.06)TO 4.8 (0.19)
SIDE
TOP
96.0
(3.78)
96.0
(3.78)
6-32 CABLING RESTRAINT
FASTENING POINT
4 PLACES
REAR
FRONT
92.0
(3.62)
92.0
(3.62)
R=4.8 (0.19)
MAXIMUM
100.0 MINIMUM
(3.94)
100.0 MINIMUM
(3.94)
PANEL CUTOUT DETAIL
NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. REAR VIEW SHOWN WITHOUT NETWORK
COMMUNICATIONS.
TRIP
ALARM
ACTIVE
UPI
RESET ENTER
ESC
FEEDER PROTECTION UNIT FPU-32
LITTELFUSE STARTCO
MAIN MENU
Metering Ñ
²Messages Ñ
Setup Ñ
FIGURE 2.1 FPU-32 Outline and Panel-Mounting Details.

Page 2-3
FPU-32 Feeder Protection Unit Rev. 2-A-103014
Installation
E
RM SN S
13 15 1714 16
AB C
O
M
C
CIM
18 19
T
AT BT C
TEMP AN OUT
20 2321 E
FA BA ALS
24 22
12 11 10 9 8 7 6 5 4 3 2 1
L
1
L
2
/
N
RELAY 1
RELAY 3
RELAY 2
31 29 2730 28
2
4
V
S
H0 V
26 25
DIG IN
I/O MODULE
COMM
TIA-232 ONLY
91.1
(3.59)
142.9
(5.63)
8.0
(0.32)
HOLE PLUGS
(TOP AND BOTTOM
SURFACES)
SIDE
TOP
96.0
(3.78)
122.5
(4.82)
16.6
(0.65)
NOTE 3
REAR
FRONT
19.0
(0.75)
9.9
(0.39)
19.0
(0.75)
(NOTE 5)
76.2
(3.00)
5.0
(0.20)
112.0
(4.41)
M4 OR 8-32TAP
25.4
(1.00)
(NOTE 5)
MOUNTING DETAIL
NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. REAR VIEW SHOWN WITHOUT NETWORK
COMMUNICATIONS.
3. MOUNT SURFACE MOUNTING BRACKETS
WITH 6-32 x 0.375 PAN-HEAD SCREWS AND
LOCKWASHERS.
4. FPU-32 MOUNTING SCREWS: M4 OR
8-32 PAN HEAD.
5. MINIMUM CLEARANCE TO ADJACENT
OBJECTS.
6. MOUNTING-HOLE PATTERN IDENTICALTO
SURFACE-MOUNT FPU-16A.
TRIP
ALARM
ACTIVE
UPI
RESET ENTER
ESC
FEEDER PROTECTION UNIT FPU-32
LITTELFUSE STARTCO
MAIN MENU
Metering Ñ
²Messages Ñ
Setup Ñ
FIGURE 2.2 FPU-32 Outline and Surface-Mounting Details.

Page 2-4
FPU-32 Feeder Protection Unit Rev. 2-A-103014
Installation
1
R
2
S
3
5
4
1
5
R
6
S
7
5
8
1
9
R
10
S
11
5
12
1
PHASE A
EARTH FAULT
PHASE B PHASE C
CURRENT INPUT MODULE
MPU-CIM
27
1
26
R
25
5
24
S
23
E
22 21
X
20
Y
19
E
F
1
18 17
E
F
2
16
C
O
M
15
C
14
B
13
A
MPU
52.5
(2.07)
56.0 (NOTE 3)
(2.20)
TOP SIDE
SHORTING SCREWS
A, B, & C (NOTES 4 & 5)
BOTTOM
12.5
(0.50)
60.0
(2.36)
14.5
(0.57)
M4 OR 8-32TAP
100.0
(3.94)
6.8
(0.27)
6.8
(0.27)
MOUNTING DETAIL
NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. MOUNTING SCREWS: M4 OR 8-32.
3. OVERALL HEIGHT WHEN MOUNTED
ON DIN EN50022 35-mm x 7.5-mm
TOP-HAT RAIL.
4. SHORTING SCREWS ARE ACCESSIBLE
FROM BOTTOM OF MPU-CIM.
5. SHORTING SCREWS: 6-32 x 0.375
NICKEL-PLATED-BRASS BINDING HEAD.
DO NOT SUBSTITUTE.
87.0
(3.43)
112.5
(4.43)
FIGURE 2.3 MPU-CIM Outline and Mounting Details.

Page 2-5
FPU-32 Feeder Protection Unit Rev. 2-A-103014
Installation
LR 53428
USC
R
R
121.0
(4.76)
20.5
(0.81)
M5 SCREWS
30.0
(1.18)
56.0
(2.21)
46.0
(1.81)
121.0
(4.76)
80.0
(3.15)
NOTE 2
MOUNTING DETAIL
TOP
25.0
(0.98)
82.0
(3.23)
69.8
(2.75)
EFCT - 1FC
FLUX
CONDITIONER
(OPTIONAL)
138.0 MAX
(5.43)
5.5
(0.22)
110.0
(4.33)
5.5
(0.22)
22.0
(0.87)
5.0 (0.20) Ø
RECESSED FOR
8-mm HEX NUT
1.0 (0.04) DEEP
FRONT
NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. MOUNTING SCREWS: M4 OR 8-32.
3. PRESS MOUNTING FEET IN PLACE USING
INSTALLATIONTOOL PROVIDED.
4. RoHS COMPLIANT.
5. EN 60044-1 COMPLIANT.
30.0
(1.18)
SIDE
56.0
(2.21)
126.0
(4.96)
EFCT-1 EARTH FAULT CT
600 V CLASS, INSULATION CLASS A
FIGURE 2.4 EFCT-1 Outline and Mounting Details.

Page 2-6
FPU-32 Feeder Protection Unit Rev. 2-A-103014
Installation
P
P
SS
2
2
11
215.0
(8.46)
64.0
(2.52)
31.0
(1.22)
M5 SCREWS
TOP MOUNTING DETAIL
52.3
(2.06)
215.0
(8.46)
162.0
(6.38)
M5 OR 10-32TAP
26.5
(1.04)
25.0
(0.98)
236 MAX
(9.29)
139.7
(5.50)
FLUX CONDITIONER
(INCLUDED)
BONDING
SCREW
5.0 (0.20) DIA
8.5
(0.33)
8.5
(0.33)
SIDE
31.0
(1.22)
198.0
(7.80)
60.0
(2.36)
FRONT
215.0
(8.46)
LR 53428
USC
R
R
EFCT-2 EARTH FAULT CT
600 V CLASS, INSULATION CLASS A
NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. MOUNTING SCREWS: M5 OR 10-32.
3. RoHS COMPLIANT.
4. EN 60044-1 COMPLIANT.
FIGURE 2.5 EFCT-2 Outline and Mounting Details.

Page 2-7
FPU-32 Feeder Protection Unit Rev. 2-A-103014
Installation
P
P
SS
2
2
1
1
26.5
(1.04)
68.0
(2.68)
17.0
(0.67)
M5 SCREWS
TOP
68.0
(2.68)
34.0
(1.34)
52.5
(2.07)
42.6
(1.68)
M4 OR 8-32TAP
MOUNTING DETAIL
25.0
(0.98)
110.0 MAX
(0.43)
72.0
(2.83)
34.0
(1.34)
26.0
(1.02)
58.0
(2.28)
5.0
(0.20)
5.0
(0.20)
7. 0
(0.87)
4.0 (0.16) Ø
RECESSED FOR
7-mm HEX NUT
3.0 (0.12) DEEP
FRONT
26.5
(1.04)
52.5
(2.07)
SIDE
MOUNTING FOOT
INSTALLATION
TOOL
DETAIL ‘A’
LR 53428
USC
R
R
EFCT-26 EARTH FAULT CT
600 V CLASS, INSULATION CLASS A
NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. MOUNTING SCREWS: M4 OR 8-32.
3. PRESS MOUNTING FEET IN PLACE USING
INSTALLATIONTOOL PROVIDED.
(DETAIL ‘A’)
4. RoHS COMPLIANT.
5. EN 60044-1 COMPLIANT.
6. NOT ALL CERTIFICATIONS SHOWN.
FIGURE 2.6 EFCT-26 Outline and Mounting Details.

Page 2-8
FPU-32 Feeder Protection Unit Rev. 2-A-103014
Installation
This page intentionally left blank.

Page 3-1
FPU-32 Feeder Protection Unit Rev. 2-A-103014
System Wiring
3. SYSTEM WIRING
3.1 GENERAL
A typical connection diagram for the FPU-32 with the
MPU-CIM is shown in Fig. 3.1.
12 11 10 9 8
111555
SSS
RRR
7654321
(NOTE 6)
13 14 15 16
ABC
C
O
M
E
F
2
18 19
E
F
1
17
YX
20 21 22 23 24 25
ES5R
26
1
27
EARTH FAULT
MPU
13
31
14
30
15
29
16
28
17
27
18
26
19
25
20 21 22 23 24
A
CIM
BCC
O
M
0
V
E
RM SN S
L
1
L
2
N
S
H-++ 24
V
COMM
I/O MODULE
AN OUT
TIA-232 ONLY
DIG IN
E
FA BLS
A
A
-
+
12 11 10 9 8 7 6 5 4 3 2 1
RELAY 2 RELAY 1
RELAY 3
PHASE C PHASE B PHASE A
81
T
AT
BT C
TEMP
SOURCE
A
B
C
BREAKER PHASE CT’S
(NOTE 7) EARTH-FAULT CT
LOAD
(NOTE 8)
(NOTE 10)
+tº
tº
Pt100 RTD
SENSOR
(NOTE 10)
(NOTE 3)
(NOTE 4)
OUTPUT
S1
(NOTE 5)
CONTROL
CIRCUIT
SUPPLY
VOLTAGE
NOTES:
1. FPU-32 REAR VIEW SHOWN.
2. RELAYS SHOWN DE-ENERGIZED.
3. GROUND CABLE SHIELDS AT FPU-32 END ONLY.
4. GROUND OUTPUT-CABLE SHIELD AT RECEIVER
END ONLY.
5. PROGRAMMABLE DIGITAL INPUT.
6. DOTTED LINES SHOW 1-A-CT CONNECTIONS.
7. A-B-C PHASE ROTATION REQUIRED.
8. EARTH-FAULT INPUT IS NOT POLARITY SENSITIVE.
9. OPTIONAL NETWORK COMMUNICATIONS
NOT SHOWN.
10. ALTERNATE CONNECTION FOR PTC-THERMISTOR
SENSOR.
MPU-CIM
FPU-32
FIGURE 3.1 Typical FPU-32 Connection Diagram.

Page 3-2
FPU-32 Feeder Protection Unit Rev. 2-A-103014
System Wiring
3.2 WIRING CONNECTIONS
3.2.1 FPU-32 CONNECTIONS
The FPU-32 wire-clamping terminal blocks accept 24
to 12 AWG (0.2 to 2.5 mm2) conductors. These terminal
blocks unplug to allow the FPU-32 to be easily replaced.
3.2.1.1 SUPPLY VOLTAGE
Derive supply voltage from the line side of the breaker
or from an independent source. Connect supply voltage
to terminals 2 and 3 (L1 and L2/N) as shown in Fig. 3.1.
In 120-Vac systems, L2/N is designated as the neutral
conductor. For direct-current power supplies, use L1 for
the positive terminal and L2/N as the negative terminal.
Ground terminal 8 ( ).
3.2.1.2 CIM INPUT
Connect the FPU-32 to the MPU-CIM as shown in
Figs. 3.6 and 3.7 using the cable provided with the
MPU-CIM.
3.2.1.3 DIGITAL INPUT
A 24-Vdc digital input is provided on terminals 25 and
26. This input is polarity sensitive. For a logical 1,
terminal 26 must be positive with respect to terminal 25.
See Section 4.2.6.
The current-limited 24-Vdc source (terminals
27 & 31) can be used for the digital input.
3.2.1.4 ANALOG OUTPUT
The analog output is switch selectable as self powered
or loop powered.
For the self-powered connection, set the L/S switch to
the S position. The self-powered connection is shown in
Fig. 3.2 (a). The analog output is referenced to the I/O
module supply, terminal 27.
For the loop-powered connection, set the L/S switch to
the L position. The loop-powered connection is shown
in Fig. 3.2 (b). In loop-powered operation, the analog-
output is isolated from all other FPU-32 terminals.
a) SELF POWERED (S POSITION)
AA
AB
24
23
RECEIVER
TERMINATION
b) LOOP POWERED (L POSITION)
AA
AB +-
LOOP
SUPPLY
24
23
RECEIVER
TERMINATION
FIGURE 3.2 Analog-Output Connections.
3.2.1.5 PTC or RTD INPUT
The temperature-sensor input on the FPU-32 can be
configured for either PTC or Pt100 RTD operation as
shown in Fig. 3.3.
a) PTC
b) Pt100 RTD
19
18
17
TC
TB
TA
+t˚
19
18
17
TC
TB
TA
t˚
FIGURE 3.3 Temperature-Sensor Connections.
3.2.1.6 I/O MODULE COMMUNICATIONS
The I/O module communications interface is used to
support optional modules.
At the publication date, no optional FPU-32 modules
were available. The 24-Vdc supply can be used to power
the digital input as outlined in Section 4.2.6.
I/O module communication is based on the two-wire
multi-drop TIA-485 standard but uses a proprietary
protocol. Overall line length must not exceed 1.2 km
(4,000’). For line lengths exceeding 10 m (33’), 150-
terminations are required at the cable ends. See Fig. 3.4.
NOTE: I/O communication is shared with the display.
Incorrect wiring can cause the display and keypad to
freeze.
+
+
+
-
-
-
FPU-32 31
30
29
28
27
3R
t
RED
GREEN
WHITE
BLACK
I/0
MODULE
R
t
NOTES:
1. INTERCONNECT CABLE BELDEN 3124A
OR EQUIVALENT.
2. R
t
= 150 OHMS, 1/4 WATT. REQUIRED FOR LINE
LENGTHS EXCEEDING 10 M (33’).
+24V
+
SH
-
0V
I/0
MODULE
FIGURE 3.4 I/O Module Connection Diagram.

Page 3-3
FPU-32 Feeder Protection Unit Rev. 2-A-103014
System Wiring
3.2.1.7 RS/EIA/TIA-232 COMMUNICATIONS
An RJ-45 TIA-232 connector is provided on the rear
panel of the FPU-32. This port uses the ModbusRTU
protocol to communicate with SE-Comm-RIS PC-interface
software. For ModbusRTU protocol, see Appendix C.
The slave ID and communication baud rate are set in the
Setup Hardware Local Comms menu.
Table 3.1 shows the pinout for the optional CA-945
adapter for operation with SE-Comm-RIS. See Fig. 3.1 for
RJ-45 pinout. For a USB connection, use a SE-ICUSB232
adapter.
TABLE 3.1 CA-945 ADAPTER
NAME RJ-45 DB9
RI/DSR 1 9
CD 2 1
DTR 3 4
SG 4
(
1
)
5
RD 5
(
1
)
2
TD 6
(
1
)
3
CTS 7 8
RTS 8 7
(1) Minimum requirement for communications.
3.2.2 MPU-CIM CONNECTIONS
The MPU-CIM CT-input terminal blocks accept 22 to
10 AWG (0.3 to 4.0 mm2) conductors. The remaining
MPU-CIM clamping blocks accept 24 to 12 AWG
(0.2 to 2.5mm2) conductors.
The MPU-CIM contains four signal-conditioning
interface transformers which are interconnected as shown
in Fig. 3.5. These transformers isolate the FPU-32 from
the phase and earth-fault CT's. The MPU-CIM eliminates
the need for CT shorting contacts when the FPU-32 is
disconnected. Phase-CT and earth-fault-CT secondaries
can be simultaneously grounded through terminal 22 and a
jumper to terminal 20. For applications where the CT
secondaries must be grounded at another location, the CT
secondaries can be isolated by removing shorting screws
A, B, and C through holes in the bottom of the MPU-CIM.
See Figs. 2.3 and 3.5.
NOTE: A-B-C phase sequence and polarity must be
observed when connecting phase CT’s. See Section 4.2.1.
Connect the MPU-CIM to the FPU-32 as shown in
Figs. 3.6 and 3.7 using the cable provided with the
MPU-CIM.
TB3 TB2
27 26 25 24 23 22 21 20 19 18 17 16 15 14 13
1R5SEXYE
F
1
E
F
2
C
O
M
CBA
ABC
RS51RS51RS51
1234567891011
12
TB1
NOTES:
1. REMOVE SHORTING SCREWS A, B, AND CTO ISOLATE PHASE-CT
AND EARTH-FAULT-CT SECONDARIES FOR IN-LINE APPLICATIONS.
2. SHORTING SCREWS A, B, AND C: 6-32 x 0.375
NICKEL-PLATED-BRASS BINDING HEAD. DO NOT SUBSTITUTE.
3. SHORTING SCREWS A, B, AND C MUST NOT BE REMOVED FOR
RESIDUAL ORTWO-CT CONNECTIONS.
4. EACHTERMINAL ON TB1 ANDTB3 WILL ACCEPT ONE
NO. 10 AWG CONDUCTOR.
FIGURE 3.5 MPU-CIM Schematic.

Page 3-4
FPU-32 Feeder Protection Unit Rev. 2-A-103014
System Wiring
3.2.2.1 STANDARD
Standard connections with earth-fault CT’s are shown in
Fig. 3.6. Dotted lines indicate 1-A-CT connections. Use
shielded cable for EFCT-1 or EFCT-2 connections. Ensure
only current-carrying phase conductors pass through the
earth-fault-CT window and that ground conductors do not.
3.2.2.2 RESIDUAL EARTH-FAULT
The residual earth-fault connection is shown in
Fig. 3.7 (a). Dotted lines indicate 1-A-CT connections.
Use three identical CT’s for this connection.
This connection is a legacy from FPU-16 applications.
The FPU-32 calculates residual current. See Section 4.2.2.
3.2.2.3 TWO-CT
The two-CT connection is shown in Figs. 3.7 (b) and
3.7 (c). Dotted lines indicate 1-A-CT connections. Since
this connection derives the current in the unmonitored
phase, this connection should be used only in retrofit
applications where it is not possible to install a third CT.
EFCT-X
a) STANDARD CONNECTION
FPU-32
1-A OR 5-A
EARTH-FAULT
CT
1A
5A
S
H
E
F
C
O
MCBA
29 21 22 16 15 14 13
BROWN
BLUE
GREEN
RED
WHITE
BLACK
27 26 25 24 23 22 21 20 19 18 17 16 15 14 13
C
O
M
CBA
E
F
2
E
F
1
Y
X
E
S
5
R
1
RS51RS51RS51
12 3456789
10 11 12
5A
5A 5A
1A 1A
1A
CT A CT B CT C
STERMINALS ARE GROUNDED
THROUGH TERMINAL 22
b) STANDARD CONNECTION WITH EFCT-1 OR EFCT-2
S
H
E
F
C
O
MCBA
29 21
22 16 15 14 13
FPU-32
BROWN
BLUE
GREEN
RED
WHITE
BLACK
C
O
M
CBA
E
F
2
E
F
1
Y
X
E
S
5
R
1
27 26 25 24 23 22 21 20 19 18 17 16 15 14 13
RS51RS51RS51
123456789
10 11 12
5A
5A 5A
1A 1A 1A
CT A CT B CT C
MPU-CIM
MPU-CIM
S AND E TERMINALS ARE GROUNDED.
STHROUGHTERMINAL 22,
ETHROUGHTERMINAL 18.
FIGURE 3.6 MPU-CIM Standard Connections.