Littlefuse Startco EL731 User manual

EL731 MANUAL
AC/DC SENSITIVE
EARTH-LEAKAGE RELAY
February 28, 2012
REVISION 2
Copyright © 2012 by Littelfuse Startco
All rights reserved.
Publication: EL731
Document: S95-P401-00001
Printed in Canada.
www.DataSheet.co.kr
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Pub. EL731, February 28, 2012
Factory default password is 1111
New Password
See Section 3.2.4.
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Page i
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
TABLE OF CONTENTS PAGE
1. Introduction................................................................... 1
1.1 General .................................................................... 1
1.2 EL731 Features ....................................................... 1
1.2.1 Metering.......................................................... 1
1.2.2 Data Logging.................................................. 1
1.2.3 Inputs and Outputs ......................................... 1
1.2.4 Operator Interface .......................................... 1
1.2.5 Communications Interface............................. 1
2. Installation..................................................................... 2
2.1 System Wiring......................................................... 2
2.1.1 Supply Voltage............................................... 2
2.1.2 Current Transformer Connections................. 2
2.1.3 Analog Output ................................................ 2
2.1.4 PTC or RTD Input.......................................... 2
2.1.5 Ethernet/IP Communications (optional) .......2
2.1.6 Remote Reset.................................................. 2
2.1.7 Relay Outputs ................................................. 2
2.2 Calibration ............................................................... 2
3. Operation and Setup.................................................... 7
3.1 Display and Indication ............................................ 7
3.1.1 Front-Panel LED Indication ..........................7
3.1.1.1 Trip ........................................................ 7
3.1.1.2 CT Status ............................................... 7
3.1.1.3 Alarm ..................................................... 7
3.1.2 Ethernet/IP Module LED Indication ............. 7
3.2 Main Menus ............................................................ 8
3.2.1 Metering.......................................................... 8
3.2.2 Messages......................................................... 8
3.2.3 Setup ............................................................... 8
3.2.3.1 Earth-Fault-CT Input ............................ 8
3.2.3.2 Temperature Protection......................... 8
3.2.3.3 Output Relay Assignments ................... 8
3.2.3.4 Analog Output....................................... 8
3.2.3.5 Miscellaneous Configuration................ 9
3.2.3.5.1 Password.................................... 9
3.2.3.5.2 Menu Timeout........................... 9
3.2.3.5.3 Maintenance .............................. 9
3.2.4 Password......................................................... 9
3.3 Trip Reset ................................................................ 9
4. Theory of Operation................................................... 13
4.1 CT1 Theory of Operation .....................................13
4.2 CT2 Theory of Operation .....................................13
5. Personal Computer Interface....................................13
5.1 Flash Memory Update ..........................................13
6. Technical Specifications............................................. 14
6.1 EL731 .................................................................... 14
6.2 Current Sensors ..................................................... 15
7. Ordering Information................................................ 15
8. Warranty .....................................................................15
9. Performance Test........................................................ 16
10. Appendix A.................................................................. 18
11. Appendix B.................................................................. 20
LIST OF FIGURES
PAGE
1 EL731 Outline and Mounting Details ........................... 3
2 AC700-SMK Outline and Mounting Details................ 4
3. Panel and Surface Mounting Connections .................... 4
4. Connection Diagram ...................................................... 5
5. EL731 with installed Anybus Communications
Module (AC-700-CUA-0X)................................................. 6
6. EL731 with installed Firmware Upgrade Module
(AC-700-CUA-00)................................................................ 6
7. EFCT-1 Outline and Mounting Details....................... 10
8. EFCT-2 Outline and Mounting Details....................... 11
9. EFCT-26 Outline and Mounting Details..................... 12
10. Earth-Fault-Test Circuit ............................................... 16
LIST OF TABLES
PAGE
1. Trip Flash Codes ............................................................ 7
2. Network Status LED (NS) ............................................. 7
3. Module Status LED (MS) .............................................. 7
4. Link/Activity LED (LINK)............................................ 7
5. CT2 Input Filters ............................................................ 8
6. Relay Functions .............................................................. 8
7. Earth-Fault-Test Record............................................... 16
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.
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Page ii
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
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Page 1
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
1 INTRODUCTION
1.1 GENERAL
The EL731 is a microprocessor-based earth-leakage
relay for AC, DC, combined AC/DC, and variable-
frequency power circuits supplied by solidly or
resistance-grounded systems that require earth-leakage
detection as low as 30 mA. Earth-leakage metering and
two setting levels (alarm and trip) are provided. A
temperature-sensor input provides metering and
protection for a motor or drive. It is uniquely suited for
sensitive earth-fault protection for adjustable-speed drive
(ASD) circuits that often operate at low speeds.
Settings and configuration selections provide
frequency-response ranges of 0 to 90 Hz, 20 to 90 Hz,
190 to 15,000 Hz, 20 to 15,000 Hz, and 0 to 15,000 Hz.
In each case, alarm- and trip-setting ranges are 30 to
5,000 mA.
Three output relays with normally closed and normally
open contacts can be programmed for various functions
and can be set to operate in the fail-safe or
non-fail-safe mode for undervoltage or shunt-trip
applications.
Additional features include a 2 x 16-character OLED
display, current and temperature metering, programming
and menu-navigation push buttons, password security,
LED trip and alarm indication, auto-reset alarms and
latching trips with front-panel and remote reset, trip
memory, 4- to 20-mA analog output, CT verification
with LED indication, and conformal coated circuits.
Earth-leakage current is sensed by one or two EFCT-
series core-balance zero-sequence current transformers.
The trip level range of the earth-leakage circuit is 30 to
5,000 mA. With two CT’s connected, the EL731
performs independent metering. Trip-time delay is
configurable from instantaneous to two seconds in
millisecond increments.
An optional Ethernet/IP communications interface is
available. Contact the factory for other communication
interface options.
1.2 EL731 FEATURES
AC Ground Overcurrent (50G/51G)
DC Ground Overcurrent (79G)
PTC Overtemperature (49)
RTD Temperature (38, 49)
1.2.1 METERING
Earth-Leakage Current
RTD Temperature or PTC Overtemperature
1.2.2 DATA LOGGING
Trip Counters
Alarm Counters
1.2.3 INPUTS AND OUTPUTS
AC Earth-Leakage Current Transformer (CT2)
AC/DC Earth-leakage Current Transformer (CT1)
Remote Reset Input (one shot operation)
Network Communications (Ethernet/IP – Optional)
4-20-mA Analog Output (programmable, loop
powered)
Temperature-Sensor input (RTD or PTC)
Three output relays, programmable
1.2.4 OPERATOR INTERFACE
2 x 16 OLED display
Display control and programming keys
LED status indication
1.2.5 COMMUNICATIONS INTERFACE
An optional Ethernet/IP interface is available.
An optional update adapter is available for firmware
updates. For ordering information, see Section 7.
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Page 2
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
2. INSTALLATION
Outline and details for panel-mounting an EL731 are
shown in Fig. 1. Insert the EL731 through the cutout and
slip the panel-mount clamp over the EL731 body. Slide
the panel-mount clamp forward to engage the latch tabs
with the mating body retainer grooves. Lock the unit in
place by tightening the four clamp screws against the
panel.
NOTE: Do not over tighten the clamp screws as this
might deform the clamp and release the latch tabs.
Outline and details for surface-mounting the EL731
are shown in Figs. 2. A detailed instruction sheet is
included with the optional AC700-SMK Surface-
Mounting Hardware Kit.
2.1 SYSTEM WIRING
A typical connection diagram for the EL731 is shown
in Fig. 4 and terminal-layout diagrams are shown in Fig.
3.
2.1.1 SUPPLY VOLTAGE
Provide supply voltage from the line side of the
controller or from an independent source. Connect
supply voltage to terminals 14 and 15 (L1, L2/N) as
shown in Fig. 4. 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. Connect terminal 16 ( ) to ground.
2.1.2 CURRENT TRANSFORMER CONNECTIONS
This earth-leakage relaying system consists of an
EL731 earth-leakage relay and one or two EFCT-series
current sensors connected as shown in Fig. 4.
The system can use CT1 or CT2 individually or
combined.
Pass the phase conductors through the CT window(s)
and position them in the centre of the opening (for 4-wire
and single-phase systems, also pass the neutral conductor
through the CT window). Do not pass earth conductors
through the CT window. In applications that require
shields or drain wires to pass through the CT window,
return them through the CT window before connecting
them to earth.
Using shielded twisted-pair cable, connect CT1 to
terminals 8 and 7 and connect the shield to terminal 6.
Current-sensor connections are not polarity sensitive.
See Figs. 7, 8 and 9 for current-sensor dimensional
drawings. Each EFCT-series sensor includes 6 m (19.2’)
cable.
Using shielded twisted-pair cable, connect CT2 to
terminals 11 and 10, connect the shield to terminal 9.
Current-sensor connections are not polarity sensitive.
See Figs. 7, 8 and 9 for current-sensor dimensional
drawings. Each EFCT-series sensor includes 6 m (19.2’)
cable.
2.1.3 ANALOG OUTPUT
The 4-20-mA analog output is loop powered. The
connection is shown in Fig. 4. The analog output is
isolated to 120 Vac from all other EL731 terminals.
2.1.4 PTC OR RTD INPUT
The temperature-sensor input can be configured for
either RTD or PTC operation. Connect as shown in
Fig. 4.
Select the sensor type in the Setup | Hardware | Temp
Sensor menu
2.1.5 ETHERNET/IP COMMUNICATIONS (OPTIONAL)
The EL731 supports an Ethernet/IP communications
interface. The communications interface module installs
through the side of the enclosure as shown in Fig. 5.
To field-install an AC-700-CUA Communications
Upgrade Adapter, remove the supply voltage, remove the
adapter access cover, insert the adapter, and retain with
the supplied screws. Apply the supply voltage.
With the communications module installed, a standard
RJ45 network cable can be used to connect the EL731 to
an Ethernet/IP network. Configure the interface using the
IP config software available at www.startco.ca. The
software requires Microsoft Windows operating system.
The Ethernet interface supports 10/100-Mbit, full- or
half-duplex operation.
2.1.6 REMOTE RESET
If required, connect a normally open switch to the
remote-reset input (terminals 12 & 13) as shown in
Fig. 4.
2.1.7 RELAY OUTPUTS
The EL731 has three programmable Form-C relay
outputs. Program choices are trip, alarm, watchdog or
current detected. See Section 3.2.3.3.
2.2 CALIBRATION
If the low-frequency CT1 input is used, the EL731
must be calibrated in order to ensure an accurate current
measurement.
To calibrate, connect an EFCT-series current sensor to
the EL731 and ensure that no CT-primary current is
present. Apply EL731 supply voltage and navigate to
menu item Setup | Protection | CT1 Earth Fault |
Calibrate. Press Enter to begin the calibration process.
The CT LED will flash, during the calibration process,
which takes about 30 seconds.
If the CT is ever replaced, this procedure must be
repeated to maintain current-measurement accuracy.
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Page 3
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
48.0
(1.89)
96.0
(3.78)
91.5
(3.60)
FRONT
TOP
PANEL THICKNESS
1.6 (0.06)TO 4.8 (0.19)
NOTES:
SIDE
43.5
(1.71)
119.0 MAX
(4.68)
10.0
(0.39)
1. DIMENSIONS IN MILLIMETRES (INCHES).
REAR
PANEL CUTOUT DETAIL
92.0
(3.62)
44.0
(1.73)
R=4.8 (0.19)
MAXIMUM
100.0 MINIMUM
(3.94)
50.0 MINIMUM
(1.97)
113 23456789101112
14151617181920212223242526
COMMUNICATIONS
ADAPTOR
ACCESS COVER
CLAMP RETAINER
GROOVES
PANEL-MOUNT CLAMP
Figure 1. EL731 Outline and Mounting Details.
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Page 4
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
MOUNTING DETAIL BOTTOM VIEW
FRONT VIEWSIDE VIEW
60.0
(2.36)
112.0
(4.41)
100.0
(3.94)
M4 OR 8-32TAP
12.0
(0.47)
81.2
(3.20)
21.2
(0.83)
112.0
(4.41)
81.2
(3.20)
125.4
(4.94)
121.9
(4.80) 100.0
(3.94)
60.0
(2.36)
81.2
(3.20)
M4 OR 8-32TAP
4 LOCATIONS
CABLE-TIE EYELET
4 LOCATIONS
NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. SIDE VIEW SHOWN WITH 35 MM x 7.5 MM TOP-HAT RAIL.
Figure 2. AC700-SMK Outline and Mounting Details.
113 23456789101112
14151617181920212223242526
14
15
16
17
1819202122
232425
26 14 15 16 17 18 19 20 21 22 23 24 25 26
123456 7 891011
12 13
L1
L2/N
NCK1K2K3
POWER
RELAY 1RELAY 2RELAY 3 POWER RELAY 1 RELAY 2 RELAY 3
ANALOG OUT RTD / PTC CT1 CT2
REMOTE
RESET
AA AB TA TB TC SH1 S12 S11 SH2 S22 S21 GND RST
L1 L2/N NC K1 K2 K3
PANEL MOUNTED SURFACE MOUNTED
12
3
4
56
7
8
910111213
AAAB
TA
TB
TC
SH1
S12S11SH2S22S21
GNDRST
ANALOG OUT
RTD / PTC
CT1
CT2
REMOTE
RESET
12345678910 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 26
Figure 3. Panel and Surface Mounting connections
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Page 5
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
EL731
REMOTE
RESET
4-20 mA
14
K1
K2
K3
S21
S22
SH2
L1
19
22
25
11
10
9
S11
S12
SH1
7
8
6
RST
GND
13
12
OPTIONAL
NETWORK
COMMUNICATIONS
LINE 1
DC-90 Hz
CT
20-15000 Hz
CT
L2/N 15
16
20
18
C
FAULT
21
23
24
26
LINE 2/N
17
5
4
3
NC
TC
TB
TA
RTD/PTC
2
AB
1
AA
ANALOG
OUT
+tº
TC
TB
TA
TC
TB
TA
PTC RTD
tº
CT2
CT1
SUPPLY
+
-
TERMINATION
NOTE 1
NOTES:
1. CT CONNECTIONS ARE NOT POLARITY SENSITIVE.
Figure 4. Connection Diagram.
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Page 6
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
Figure 5. EL731 with installed Anybus Communications Module (AC-700-CUA-03).
Figure 6. EL731 with Firmware Upgrade Module (AC-700-CUA-00).
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Page 7
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
3. OPERATION AND SETUP
3.1 DISPLAY AND INDICATION
The EL731 front panel has three LED’s, a
2-line x 16-character alphanumeric OLED display and
four push buttons to navigate through programming,
status, and system-information menus. The display will
revert to screen-saver mode after 15 minutes. Press any
key to exit the screen saver.
The RESET key is used to clear an earth-leakage-fault
or overtemperature trip. The fault condition must no
longer be present to allow a reset. Continually pressing
the reset key will not prevent a trip.
The up and down arrow keys (▲▼) are used to
navigate the menu system.
The ENTER key is used to select menu items and to
choose settings.
All EL731 settings can be accessed using the EL731
menu system or the optional network communications
interface. In the following sections, menu items and
setup parameters are listed in italics and are shown in the
format displayed on the OLED display.
Menu selection is in the following format:
Menu 1 | Sub Menu 1 | Sub Menu 2 | Sub Menu 3 |…
When browsing a selection list, an asterisk (*)
indicates the active item. If the intent is to exit the list
and not to change the setting, press ENTER on the
selection that has the asterisk (*).
If the item is a string (or numerical) input and no
change is desired, press ENTER until the display returns
to the menu system. To exit a main-menu list, scroll and
select Exit.
A menu map is provided in Appendix A at the end of
this manual.
3.1.1 FRONT-PANEL LED INDICATION
3.1.1.1 TRIP
The red LED labeled TRIP indicates a trip condition
when flashing. Refer to Table 1 for applicable flash
codes.
TABLE 1: TRIP FLASH CODES
FAULT CODES
Overcurrent CT1 1 short, 1 long
Overcurrent CT2 2 short, 1 long
CT1 Detection 3 short, 1 long
CT2 Detection 4 short, 1 long
NVRAM Error 5 short, 1 long
CT1 Calibration Failure 6 short, 1 long
RTD/PTC Trip 7 short, 1 long
User Test 8 short, 1 long
Watchdog Fast flash
Trip cause is also available on the OLED display
through the | Messages | State menu item.
3.1.1.2 CT STATUS
The green LED labeled CT will flash during CT1
calibration. It will be solid green when CT connections are
correct, and off when a CT is connected incorrectly.
3.1.1.3 ALARM
The yellow LED labeled ALARM will be on when
measured current is above an alarm setting.
3.1.2 ETHERNET/IP MODULE LED INDICATION
There are three LED’s on the optional
AC700-CUA-03 Ethernet/IP communications module.
Their purpose and indication are shown in Tables 2, 3,
and 4.
TABLE 2: NETWORK STATUS LED (NS)
LED STATE DESCRIPTION
Off No power or no IP address
Green On-line, one or more
connections established
Green, flashing On-line, no connections
established
Red Duplicate IP address,
FATAL error
Red, flashing One or more connections
timed out
TABLE 3: MODULE STATUS LED (MS)
LED STATE DESCRIPTION
Off No power
Green Controlled by a Scanner in
Run State
Green, flashing Not configured, or Scanner
in Idle state
Red Major fault (EXCEPTION-
state, FATAL error)
Red, flashing Recoverable fault(s)
TABLE 4: LINK/ACTIVITY LED (LINK)
LED STATE DESCRIPTION
Off No link, no activity
Green Link established
Green, flickering Activity
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Page 8
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
3.2 MAIN MENUS
The “top” menu item (select Exit in the main menu)
displays earth-leakage current(s) as a numeric percent of
full scale (5A) and as a bar graph.
3.2.1 METERING
Menu: Metering
With Metering selected in the main menu, press the
ENTER key to display a list of metering options. Use the
Up and Down arrow keys to scroll through the options
list. Press the ENTER key to display the selected
information.
Information available: CT1 primary current (mA),
CT2 primary current (mA), combined CT1 and CT2
current (mA), internal EL731 temperature (°C and °F),
PTC status, and RTD temperature (°C and °F).
3.2.2 MESSAGES
Menu: Messages
Selecting this menu item allows the trip state, alarm
state, trip counter, alarm counter, and EL731 running
time to be viewed.
3.2.3 SETUP
See Appendix B for a Setup Summary and Setting
Record.
3.2.3.1 EARTH-FAULT PROTECTION
Menu: Setup | Protection | CTx Earth Fault
The Earth Fault Enable/Disable menu enables or
disables current monitoring through the selected CT input.
When enabled, the system checks to ensure the CT is
connected properly. A trip will occur if an EFCT is not
connected. See section 3.1.1.1.
The Trip Time menu sets the trip delay. The range for
this menu item is 0 – 2 seconds in millisecond increments
where 0 indicates that as soon as current is detected above
the Trip Level, a trip occurs.
The Trip Level menu sets the trip level. The setting
range is 30 mA to 5 A. The Alarm Level setting range is
the same as the Trip Level range. Trips are latched,
requiring a local or remote reset input, and alarms auto-
reset.
The Calibrate menu applies to CT1 (0 to 100 Hz). When
CT1 is used, the EL731 must be calibrated after
installation, with CT1 connected and power removed from
the load. The CT LED flashes during calibration.
The Input Filter menu applies to CT2 (20 to 15,000 Hz)
and allows selection of different input filters. The available
filters and their descriptions are shown in Table 5.
TABLE 5: CT2 INPUT FILTERS
FILTER FREQUENCY RESPONSE
No Filter 20 Hz to 15 kHz
Low Pass Filter at 90Hz 20 to 90 Hz
High Pass Filter at 190Hz 190 Hz to 15 kHz
For full-spectrum protection, use CT1 and CT2 and
select the High Pass Filter to avoid frequency overlap
between the inputs.
3.2.3.2 TEMPERATURE PROTECTION
Menu: Setup | Protection | PTC Local Temp
Menu: Setup | Protection | RTD Local Temp
Menu: Setup | Hardware | Temp Sensor
The temperature-sensor input, at terminals 3, 4, and 5,
can be configured as a PTC thermistor or a 100-ohm-
platinum RTD (or disabled) in the Setup | Hardware |
Temp Sensor menu. PTC Overtemperature alarm and
trip actions can be selected in the Setup | Protection |
PTC Temperature menu, or alarm and trip temperature
settings and actions can be programmed in the Setup |
Protection | RTD Temperature menu.
3.2.3.3 OUTPUT RELAY ASSIGNMENTS
Menu: Setup | Relay Outputs | Relay x
Each of the three output relays can be assigned to one
of the functions listed in Table 6. More than one relay
can be assigned the same function.
The default assignments are Trip (fail-safe) for Relay
1, Alarm (fail-safe) for Relay 2, and Watchdog for
Relay 3.
TABLE 6: RELAY FUNCTIONS
FUNCTION ASSIGNMENT OR ACTION
Trip Relay operates when a trip
occurs. Fail-safe or
non-fail-safe mode selection is
active.
Alarm Relay operates when an alarm
occurs. Fail-safe or
non-fail-safe mode selection is
active.
Watchdog Relay is energized when the
supply voltage is applied and
the EL731 is operating
properly.
Current Relay is energized when
current is detected
The fail-safe mode setting for each relay allows the
individual relay to be configured as fail-safe (normally
energized) or non-fail-safe (normally de-energized).
The Test function performs a test of the specified
relay’s operation.
3.2.3.4 ANALOG OUTPUT
Menu: Setup | Analog Output
A 4-20 mA programmable current output is provided.
Analog % Level enables the output to be configured
such that 20 mA corresponds to full scale of the selected
CT (5 A) or corresponds to the trip level for the selected
CT.
CT Select selects which CT measurement will be
represented by the analog output. The selections are CT1,
CT2, or both.
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Page 9
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
3.2.3.5 MISCELLANEOUS CONFIGURATION
Menu: Setup | System Config
Used to access additional system configuration elements
described in the following sections.
3.2.3.5.1 PASSWORD
Menu: Setup | System Config | Change Password
Menu: Setup | System Config | Password Enable
Used to enable and change the EL731 password (four-
character numeric field). When enabled, the password
must be entered to change a set point. The default
password is 1111.
3.2.3.5.2 MENU TIMEOUT
Used to set the time before the system times out due to
lack of activity and the menu system returns to the main
menu display (See Section 3.2). In password mode the
password entered will be cleared. The timeout is
measured from the last key press.
3.2.3.5.3 MAINTENANCE
Used to clear trip and alarm counters, load defaults,
restart the system, and display the firmware version,
build date, and serial number.
3.2.4 PASSWORD
Menu: Password
With password security active, all set points are
locked. To enable programming, the password must be
entered through the Password menu.
While navigating through the menus when a valid
password has been entered, an asterisk (*) is shown at
the beginning of the first line of the display.
3.3 TRIP RESET
The RESET button will clear a trip when pressed for
two and a half seconds. The trip will only clear if the
fault is no longer present. Keeping RESET pressed will
not prevent an alarm or trip. If password is enabled,
reset will not function until the password has been
entered.
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Page 10
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
S1S2
P1
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.
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 7. EFCT-1 Outline and Mounting Details.
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Datasheet pdf - http://www.DataSheet4U.net/

Page 11
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
P
P
SS
2
2
11
SP
1
1
LR 53428
USC
R
EFCT-2 EART H F AULT CT
600 V CLASS, INSULATIONCLASS A
R
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 10-32 TAP
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
NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES)
2. MOUNTING SCREWS: M5 OR 10-32.
215.0
(8.46)
Figure 8. EFCT-2 Outline and Mounting Details.
www.DataSheet.co.kr
Datasheet pdf - http://www.DataSheet4U.net/

Page 12
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
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’
NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. PRESS MOUNTING FEET IN PLACE USING
INSTALLATIONTOOL PROVIDED (DETAIL ‘A’)
3. MOUNTING SCREWS: M4 OR 8-32.
LR 53428
USC
R
R
EFCT-1 EARTH FAULT CT
600 V CLASS, INSULATION CLASS A
Figure 9 EFCT-26 Outline and Mounting Details.
www.DataSheet.co.kr
Datasheet pdf - http://www.DataSheet4U.net/

Page 13
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
4. THEORY OF OPERATION
CT1 and CT2 have independent Trip and Alarm
current-level and time-delay set points and independent
metering. This enables different protection levels and
separate metering for the high- and low-frequency
ranges.
Full-current metering, summing CT1 and CT2
metering, is provided as an OLED metering selection, an
analog output selection, and in optional network
communications. To improve full-current-metering
accuracy by avoiding band overlap, select the CT2 high-
pass filter.
4.1 CT1 THEORY OF OPERATION
The EL731 applies a known signal to the secondary
winding of the EFCT-series sensor connected to input
CT1. Current flowing in the EFCT primary affects this
signal, and its magnitude can be accurately measured
across a wide frequency range. The EL731 can measure
current as low as 30 mA in a frequency range of 0 to 90
Hz. Open and short EFCT connections are detected.
4.2 CT2 THEORY OF OPERATION
CT2 is a core-balance zero-sequence current-
transformer application, with digital filtering to enable a
wide spectrum of analysis. There are three digital-filter
ranges: Full Range, Low Pass, and High Pass. CT2
includes detection of open or short EFCT-series current
sensor wiring.
4.2.1 CT2 FULL RANGE FILTER
The Full Range frequency selection configures the
EL731 to respond to the entire frequency spectrum that
CT2 is capable of monitoring – 20 to 15,000Hz.
4.2.2 CT2 LOW PASS FILTER
The low pass frequency selection configures the
EL731to respond to only the low end of its frequency
range – 20 to 90 Hz.
4.2.3 CT2 HIGH PASS FILTER
The high pass frequency selection configures the
EL731to respond to only the high end of its frequency
range – 190 to 15,000 Hz.
5. PERSONAL COMPUTER INTERFACE
5.1 FLASH MEMORY UPDATE
The EL731 control program is stored in flash memory.
This allows field upgrades to be made through the
upgrade module (optional). The following are required:
A Windows PC with a USB interface and the
SE-Flash program installed. SE-Flash is available
at www.startco.ca.
A file containing the EL731 code (.s19 file)
A USB cable or TIA232 through CA-945
converter with Ethernet cable.
An AC700-CUA-00 Upgrade Module
www.DataSheet.co.kr
Datasheet pdf - http://www.DataSheet4U.net/

Page 14
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
6. TECHNICAL SPECIFICATIONS
6.1 EL731
Supply:
Option 0.................................13 VA, 120 to 240 Vac
(+10, -45%) 50/60 Hz;
7 W, 100 to 250 Vdc
(+10, -25%)
Option 1.................................7 W, 32 to 60 Vdc (+20, -
25%)
9 VA, 24 to 44 Vac
(±10%), 50/60 Hz
Option 2.................................7 W, 16 to 30 Vdc (+20,
-25%)
DC and Low Frequency (Current Transformer 1)
Frequency Response...........DC to 90 Hz
Measurement Method.........True RMS
Detection Method...............CT Driven Oscillator
Trip-Level Setting ..............30 to 5,000 mA
Alarm-Level Setting...........30 to 5,000 mA
Trip-Time Settings .............0 to 2 s
Trip Accuracies:
Trip Level.......................-10% at 60 Hz
Time Delay.................... - 5% (Minimum of 35 ms
at 60 Hz)
CT ......................................EFCT series
Thermal Withstand
Continuous ......................25 A Earth-Fault
Current
1 second...........................400 A Earth-Fault
Current
Detection ............................CT Open & Short
AC/Carrier (Current Transformer 2)
Frequency Response:
Filter 1 .............................20 to 15,000 Hz
Filter 2 .............................20 to 90 Hz
Filter 3 .............................190 to 15,000 Hz
Measurement Method.........True RMS
Detection ............................CT Open & Short
Trip-Level Setting ..............30 to 5,000 mA
Alarm-Level Setting...........30 to 5,000 mA
Trip Time Settings..............0 to 2 s
Trip Accuracies:
Trip-Level .........................-10% at 60 Hz
Trip-Time......................... - 5% (minimum 25 ms at
60 Hz)
CT ......................................EFCT series
Thermal Withstand
Continuous ......................25 A Earth-Fault
Current
1 second...........................400 A Earth-Fault
Current
Output Relays:
Relay 1:
Contact configuration ......N.O. and N.C.
Operating Mode...............Fail-Safe/Non-Fail-Safe
CSA/UL Rating ...............8 A Resistive, 250 Vac,
8 A Resistive, 30 Vdc
Supplemental Contact Ratings
Make/Carry 0.2 s ........30 A
Rating Code................B300
Break:
dc........................50 W Resistive, 150 Vdc
ac........................2500 VA (PF=1.0)
360 VA (PF=0.4)
Subject to maximums of 8 A and 250 V (ac or dc)
Relays 2 & 3:
Contact configuration ......N.O. and N.C.
Operating Mode...............Fail-Safe/Non-Fail-Safe
CSA/UL Rating ...............5 A Resistive, 250 Vac,
5 A Resistive, 30 Vdc
Supplemental Contact Ratings
Make/Carry 0.2 s ........30 A
Rating Code................B300, R300
Break:
dc........................28 W Resistive
ac........................1500 VA (PF=1.0)
360 VA (PF=0.4)
Subject to maximums of 5 A and 250 V (ac or dc)
Terminals...................................Wire Clamping,
24 to 12 AWG (0.2 to
2.5 mm2) conductors
4–20 mA-Analog Output:
Type ..........................................Loop Powered
Range ........................................4 to 22 mA
Full Scale (20 mA) ...................5 A Primary
Loop Voltage............................8 to 26 Vdc
Load ..........................................500 (maximum with
24-Vdc supply)
Isolation ....................................120 Vac
Parameter ..................................CT1, CT2, or Combined
Current
Communication Options
Network Protocol ...............Ethernet/IP
Display Type .............................2x16 OLED
Dimensions: (Body)
Height ..............................44 mm (1.7”)
Width ...............................92 mm (3.6”)
Depth ...............................100 mm (3.9”)
Dimensions: (Bezel)
Height ..............................48 mm (1.9”)
Width ...............................96 mm (3.8”)
Projection.........................13.7 mm (0.54”)
Shipping Weight........................0.45 kg (1 lb)
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Datasheet pdf - http://www.DataSheet4U.net/

Page 15
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
PTC-Thermistor Input:
Cold Resistance ................ 1500 maximum at 20C
Trip Level ......................... 2800 ± 100 
Reset Level ....................... 1500 100 
Sensor Current.................. 1 mA maximum
RTD Input:
RTD Type.........................3 wire Pt100
Range................................. -40 to 200C with open
and short detection
Sensor Current ................... 1 mA
Lead Compensation ........... 25 maximum
Accuracy............................ 3C
Environment:
Operating Temperature ......-40 to 60C
Storage Temperature ..........-55 to 80C
Humidity ............................85% Non-Condensing
PWB Conformal Coating ..........MIL-1-46058 qualified
UL QMJU2 recognized
Certification .............................. CSA
LR 53428
USC
R
ULListed
CSA C22.2 No.14 Industrial Control Equipment
UL 508 Industrial Control Equipment
UL 1053 Ground Fault Sensing and Relaying
Equipment
Surge Withstand .........................
ANSI/IEEE C37.90.1-2002
(Oscillatory and Fast
Transient)
6.2 CURRENT SENSORS
EFCT-1:
Current Ratio....................... 5:0.05 A
Insulation............................. 600-V Class
Window Diameter ............... 82 mm (3.2")
Shipping Weight.................. 900 g (2.0 lb)
EFCT-2
Current Ratio....................... 5:0.05 A
Insulation............................. 600-V Class
Window Diameter ............... 139.7 mm (5.5")
Shipping Weight.................. tbd
EFCT-26
Current Ratio....................... 5:0.05 A
Insulation............................. 600-V Class
Window Diameter ............... 26 mm (1.0")
Shipping Weight.................. 450 g (1.0 lb)
7. ORDERING INFORMATION
-
EL731-
Communications:
0= None
3= Ethernet/IP
Supply:
0 – Universal AC/DC Supply
1 – 48Vdc/24Vac Supply
2 – 24Vdc Supply
00
Future Use
EFCT-1........... Earth-Fault Current Transformer,
82-mm (3.2”) window
EFCT-2........... Earth-Fault Current Transformer,
with Flux Conditioner
139-mm (5.5”) window
EFCT-26 ..........Earth-Fault Current Transformer,
26-mm (1.0”) window
EFCT-1FC .......Flux Conditioner, 70 mm (2.7”) Window
PGA-0500 ........Analog Percent Current Meter
AC700-SMK.... DIN Rail and Surface-Mount Adapter
AC700-CUA-0
Communications
Upgrade
Adapter
Adapter Type
0 – Firmware Upgrade
Module
3 – Ethernet/IP
8. WARRANTY
The EL731 Earth-Leakage Relay is warranted to be
free from defects in material and workmanship for a
period of 5 years from the date of purchase.
Littelfuse Startco will (at Littelfuse Startco’s option)
repair, replace, or refund the original purchase price of
an EL731 that is determined by Littelfuse Startco to be
defective if it is returned to the factory, freight prepaid,
within the warranty period. This warranty does not apply
to repairs required as a result of misuse, negligence, an
accident, improper installation, tampering, or insufficient
care. Littelfuse Startco does not warrant products
repaired or modified by non-Littelfuse Startco personnel.
www.DataSheet.co.kr
Datasheet pdf - http://www.DataSheet4U.net/

Page 16
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
9. PERFORMANCE TEST
Some jurisdictions require periodic earth-fault
performance tests. A test record form is provided for
recording the date and the result of the performance tests.
The following earth-fault system tests are to be
conducted by qualified personnel.
a) Evaluate the interconnected system in accordance
with the overall equipment manufacturer’s detailed
instructions.
b) Verify proper location of the EFCT current sensors.
Ensure the cables pass through the current-sensor
window. This check can be done visually with
knowledge of the circuit. The connection of the
current-sensor secondary to the EL731 is not polarity
sensitive.
c) Verify that the system is correctly earthed and that
alternate earth paths do not exist that bypass the
current sensor. High-voltage testers and resistance
bridges can be used to determine the existence of
alternate earth paths.
d) Verify proper reaction of the circuit-interrupting
device in response to a simulated or controlled earth-
fault current. To simulate earth-fault current, use CT-
primary current injection. Fig. 10 shows a test circuit
using an SE-400 Ground-Fault-Relay Test Unit. The
SE-400 has a programmable output of 0.5 to 9.9 A for
a duration of 0.1 to 9.9 seconds. Fig. 10 shows the
use of resistors that reduce the injected current to
10% of the SE-400 setting. Set the test current to
120% of the EL731 setting. Inject the test current
through the current-sensor window. Verify that the
circuit under test has reacted properly. Correct any
problems and re-test until the proper reaction is
verified.
e) Record the date and the results of the test on the
attached test-record form.
NOTE: Do not inject test current directly into current-
sensor-input terminals 10 and 11.
I
TEST
FROM
POWER
SOURCE
EFCT-X
LOAD
11 10
S21 S22
14
15
L1
L2/N
R1 L
N
R2
12
11 OP2
OP1
3
5
1
LL1
L2
N
RMT1
RMT2
8
9
REMOTE
TEST
R1 = 10 , 10 W, 1%
R2 = 0.1 , 10 W, 1%
I
TEST
= 1/10 SE-400 SETTING
EL731
SE-400
87
S11 S12
EFCT-X
Figure 10. Earth-Fault-Test Circuit.
TABLE 7. EARTH-FAULT-TEST RECORD
DATE TEST RESULTS
Retain this record for the authority having jurisdiction.
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