EL731 AC/DC Sensitive Earth-Leakage Relay Manual R6 - Littelfuse

32 Pages·2016·1.39 MB·English

by  Littelfuse Startco

3714 Kinnear Place Saskatoon, SK Canada S7P0A6 Ph: [phone] Fx: [phone] www.littelfuse.com/relayscontrols

EL731 MANUAL

AC/DC SENSITIVE
EARTH-LEAKAGE RELAY

REVISION 6-F-032816

Copyright © 2016 by Littelfuse Startco

All rights reserved.

Document Number: PM-1005-EN
Printed in Canada.
Page i
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 6-F-032816

Factory default password is 1111
New Password
See Section 3.2.4.
Page ii
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 6-F-032816

TABLE OF CONTENTS
SECTION PAGE SECTION PAGE

1 Introduction .............................................................. 1 6 Technical Specifications ........................................ 16
1.1 General ........................................................................ 1 6.1 EL731 ....................................................................... 16
1.2 EL731 Features .......................................................... 1 6.2 EMC Tests ................................................................ 17
1.2.1 Protective Functions ....................................... 1 6.3 Certification .............................................................. 18
1.2.2 Metering.......................................................... 1 6.4 Current Sensors ........................................................ 18
1.2.3 Data Logging .................................................. 1 7 Ordering Information ........................................... 19
1.2.4 Inputs and Outputs ......................................... 1 8 Warranty ................................................................. 19
1.2.5 Operator Interface .......................................... 1 9 Performance Test ................................................... 20
1.2.6 Communications Interface ............................. 1 10 Maintenance ........................................................... 20
2 Installation ................................................................. 1 Appendix A EL731 Menu Map ........................................ 22
2.1 System Wiring ............................................................ 1 Appendix B System Parameters & Setup Record ......... 24
2.1.1 Supply Voltage ............................................... 2 Appendix C EL731 Revision History .............................. 25
2.1.2 Current Sensor Connections .......................... 2
2.1.3 Analog Output ................................................ 2 LIST OF FIGURES
2.1.4 PTC or RTD Input .......................................... 2
FIGURE PAGE
2.1.5 Communications (Optional) .......................... 2

2.1.6 Remote Reset .................................................. 2
1 EL731 Outline and Mounting Details ........................... 3
2.1.7 Relay Outputs ................................................. 2
2 AC700-SMK Outline and Mounting Details ................ 4
2.2 Calibration .................................................................. 2
3 Panel and Surface Mounting Connections .................... 4
3 Operation and Setup ................................................ 9
4 Connection Diagram ...................................................... 5
3.1 Display and Indication ............................................... 9
5 AC700-CVR-00 Weatherproof Cover Outline ............. 6
3.1.1 Front-Panel LED Indication .......................... 9
6 AC700-CVR-00 Weatherproof Cover Installation ....... 7
3.1.1.1 Trip .................................................... 9
7 EL731 with installed EtherNet/IP™
3.1.1.2 CT Status ........................................... 9
Communications Upgrade Adapter
3.1.1.3 Alarm ................................................. 9
(AC700-CUA-03) .......................................................... 8
3.1.2 Communications-Module LED
8 EL731 with Firmware Upgrade Module
Indication and Status ...................................... 9
(AC700-CUA-00). ........................................................ 8
3.2 Main Menus ................................................................ 9
9 EFCT-1 Outline and Mounting Details ....................... 12
3.2.1 Metering.......................................................... 9
10 EFCT-2 Outline and Mounting Details ....................... 13
3.2.2 Messages ......................................................... 9
11 EFCT-26 Outline and Mounting Details ..................... 14
3.2.3 Setup ............................................................. 10
12 PGA-0520 Analog Percent Current Meter .................. 15
3.2.3.1 Earth-Fault Protection ..................... 10
13 Earth-Fault-Test Circuit ............................................... 21
3.2.3.2 Temperature Protection .................. 10

3.2.3.3 Output-Relay Assignments ............ 10
LIST OF TABLES
3.2.3.4 Analog Output ................................. 10
3.2.3.5 Miscellaneous Configuration ......... 11 TABLE PAGE
3.2.3.5.1 Password ......................... 11
3.2.3.5.2 Reset Password ............... 11 1 Trip LED Flash Codes ................................................... 9
3.2.3.5.3 Menu Timeout ................ 11 2 CT2 Input Filters .......................................................... 10
3.2.3.5.4 Display Filter .................. 11 3 Output-Relay Functions ............................................... 10
3.2.3.5.5 Maintenance .................... 11 4 Earth-Fault-Test Record ............................................... 21
3.2.4 Password ....................................................... 11
3.3 Trip Reset ................................................................. 11 DISCLAIMER
4 Theory of Operation .............................................. 15
4.1 CT1 Theory of Operation ........................................ 15
Specifications are subject to change without notice.
4.2 CT2 Theory of Operation ........................................ 15
Littelfuse Startco is not liable for contingent or
4.2.1 CT2 Full Range Filter .................................. 15
consequential damages, or for expenses sustained as a
4.2.2 CT2 90 Hz Low Pass Filter ......................... 15
result of incorrect application, incorrect adjustment, or a
4.2.3 CT2 3 kHz Low Pass Filter ......................... 16
malfunction.
4.2.4 CT2 190 Hz High Pass Filter ....................... 16

5 Personal Computer Interface ............................... 16
5.1 Flash Memory Upgrade ........................................... 16
Page iii
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 6-F-032816

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Page 1
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 6-F-032816

1 INTRODUCTION 1.2.3 DATA LOGGING
 Trip counters
1.1 GENERAL  Alarm counters
The EL731 is a microprocessor-based earth-leakage

relay for AC, DC, combined AC/DC, and variable-
1.2.4 INPUTS AND OUTPUTS
frequency power circuits supplied by solidly or resistance-
 AC earth-leakage current transformer (CT2)
earthed systems that require earth-leakage detection as
 AC/DC earth-leakage current transformer (CT1)
low as 30 mA (under default configuration). Earth-
 Remote reset input (one shot operation)
leakage metering and two setting levels (alarm and trip)
 Network communications (optional)
are provided. It is uniquely suited for sensitive earth-fault
 4-20-mA analog output, programmable, loop powered
protection for adjustable-speed drive (ASD) circuits that
often operate at low speeds. A temperature-sensor input  Temperature-sensor input, Pt100 RTD or PTC
provides metering and protection for a motor or ASD.  Three output relays, programmable
Settings and configuration selections provide
frequency-response ranges of 0 to 90 Hz, 20 to 90 Hz, 190 1.2.5 OPERATOR INTERFACE
to 6,000 Hz, 20 to 6,000 Hz, 20 to 3,000 Hz and 0 to 6,000  2 x 16 OLED alphanumeric display
Hz.  Display-control and programming buttons
Three Form-C (changeover) output relays with  LED status indication
normally closed and normally open contacts can be
programmed for various functions and can be set to 1.2.6 COMMUNICATIONS INTERFACE
operate in the fail-safe or The EL731 interface for optional network
non-fail-safe modes for undervoltage or shunt-trip communications adapters supports DeviceNet™,
applications. Profibus®, EtherNet/IP®, and Modbus® TCP. Units
Additional features include a 2 x 16-character OLED purchased without a communications adapter can be field-
alphanumeric display, current and temperature metering, upgraded.
programming and menu-navigation push buttons, An optional firmware upgrade module is available for
password security, LED trip and alarm indication, auto- firmware upgrades.
reset alarms and latching trips with front-panel and remote For ordering information, see Section 7.
reset, trip memory, 4- to 20-mA analog output, CT
verification with LED indication, and conformal-coated 2. INSTALLATION
circuits.
Earth-leakage current is sensed by one or two EFCT- Outline and details for panel-mounting an EL731 are
series core-balance zero-sequence current transformers. shown in Fig. 1. Insert the EL731 through the cutout and
The alarm- and trip-level ranges of the earth-leakage slip the panel-mount clamp over the EL731 body. Slide
circuit are 30 to 5,000 mA. To modify this range, the panel-mount clamp forward to engage the latch tabs
firmware settings for each CT input allow configuring the with the mating body retainer grooves. Lock the unit in
number of phase-conductor turns that are passed through place by tightening the four clamp screws against the
the CT-primary window – the lowest pickup configuration panel.
is 6 to 1,000 mA, with a setting of five turns. With two
NOTE: Do not over tighten the clamp screws as this might
CT’s connected, the EL731 performs independent
deform the clamp and release the latch tabs. The
metering. The trip-time delay has a definite-time
maximum recommended torque is 0.28 N·m (2.5 lbf·in).
characteristic and is configurable from instantaneous to
two seconds in millisecond increments. Outline and details for surface-mounting the EL731 are
shown in Fig. 2. A detailed instruction sheet is included
1.2 EL731 FEATURES with the optional AC700-SMK Surface-Mounting
1.2.1 PROTECTIVE FUNCTIONS Hardware Kit.
 AC earth overcurrent (50G/51G, 50N/51N) If an optional AC700-CVR-00 Weatherproof Cover is
 DC earth overcurrent (76G) used, follow the included installation instructions. See
 PTC overtemperature (49) Figs. 5 and 6.
 RTD temperature (38, 49)
2.1 SYSTEM WIRING
1.2.2 METERING A typical connection diagram for the EL731 is shown
in Fig. 4 and terminal-layout diagrams are shown in
 Earth-leakage current, CT1 and CT2
Fig. 3.
 RTD temperature or PTC status
A minimum 75°C (167°F) wire-temperature rating is
required.
Page 2
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 6-F-032816

2.1.1 SUPPLY VOLTAGE 2.1.5 COMMUNICATIONS (OPTIONAL)
Provide supply voltage from the line side of the The EL731 supports optional communications upgrade
controller or from an independent source. Connect supply adapters which install through the side of the enclosure as
voltage to terminals 14 and 15 (L1, L2/N) as shown in shown in Fig. 7.
Figs. 3 and 4. In 120-Vac systems, L2/N is designated as To field-install an AC700-CUA-series
the neutral conductor. For direct-current power supplies, Communications Upgrade Adapter, follow this procedure:
use L1 for the positive terminal and L2/N as the negative
terminal. Connect terminal 16 ( ) to earth.  Remove supply voltage from the EL731.
 Remove the adapter access cover on the side of the
2.1.2 CURRENT SENSOR CONNECTIONS EL731.
This earth-leakage relaying system consists of an  Insert the adapter, and retain with the supplied
EL731 earth-leakage relay and one or two EFCT-series screws.
current sensors connected as shown in Fig. 4. The system  Apply supply voltage to the EL731.
can use CT1 and CT2 individually or combined. See
Section 4. With an EtherNet/IP or Modbus TCP communications
Pass the phase conductors through the CT window(s) adapter installed, a standard RJ45 network cable can be
and position them in the centre of the opening (for 4-wire used to connect the EL731 to an EtherNet/IP or Modbus
and single-phase systems, also pass the neutral conductor TCP network. Configure the interface using the IP
through the CT window). Do not pass earth conductors Configuration Tool (IP Config) available at
through the CT window. In applications that require www.littelfuse.com/relayscontrols. The software
shields or drain wires to pass through the CT window, requires a Microsoft Windows™ operating system. The
return them through the CT window before connecting Ethernet interface supports 10/100-Mbit, full- or half-
them to earth. For applications utilizing the primary-turns duplex operation.
feature, pass the phase conductors through the opening Connect the EL731 to the network using a standard
additional times as required (maximum of 5). Ethernet patch cable. Use of a crossover cable to connect
Using shielded twisted-pair cable, connect CT1 to the EL731 directly to the computer running IP Config is
terminals 7 and 8 and connect the shield to terminal 6. not recommended. A typical router will assign an IP
Current-sensor connections are not polarity sensitive. See address to all connected computers that are using DHCP.
Figs. 9, 10 and 11 for current-sensor dimensional The EL731 is not configured to accept an IP address using
drawings. DHCP.
Using shielded twisted-pair cable, connect CT2 to If the EL731 is being set up for first time, it is
terminals 10 and 11 and connect the shield to terminal 9. recommended to only have one EL731 connected to the
Current-sensor connections are not polarity sensitive. See network to prevent communication errors.
Figs. 9, 10 and 11 for current-sensor dimensional With a DeviceNet communications adapter installed, a
drawings. standard open-style device cable can be used to connect
Each EFCT-series sensor includes 6 m (19.2’) of cable. the EL731 to a DeviceNet network. Configure the address
and baud rate through the EL731 front-panel interface or
with Rockwell Automation’s RSNetWorx software. The
NOTE: CT1 emits an audible tone when operating
DeviceNet interface supports baud rates of 125, 250, and
properly.
500 kbps.

2.1.3 ANALOG OUTPUT 2.1.6 REMOTE RESET
The 4-20-mA analog output is loop powered. Connect
If required, connect a normally open momentary switch
as shown in Fig. 4. The analog output is isolated to 120
to the remote-reset input (terminals 12 & 13) as shown in
Vac from all other EL731 terminals.
Fig. 4.

2.1.4 PTC OR RTD INPUT 2.1.7 RELAY OUTPUTS
The temperature-sensor input can be configured for
The EL731 has three programmable Form-C
either RTD or PTC operation. Connect as shown in
(changeover) relay outputs. Functional assignments are
Fig. 4.
Trip, Alarm, Watchdog or Current Detected. See Section
Select the sensor type in the Setup | Hardware | Temp
3.2.3.3.
Sensor menu.

2.2 CALIBRATION
If the low-frequency CT1 input is used, the EL731 must
be calibrated in order to ensure an accurate current
measurement.
Page 3
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 6-F-032816

To calibrate, connect an EFCT-series current sensor to The CT LED will flash, during the calibration process,
the EL731 and ensure that no CT-primary current is which takes about 30 seconds.
present. Apply EL731 supply voltage and navigate to If the CT is replaced, this procedure must be repeated
menu item Setup | Protection | CT1 Earth Fault | to maintain current-measurement accuracy.
Calibrate. Press Enter to begin the calibration process.

NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
REAR
91.5
(3.60)
92.0
(3.62)
EELL773311--0011-10
EARTH-ALCE/ADKCA SGEEN RSEITLIVAEY
RM=A4X.8I M(0U.1M9) LCR 5342UR8SSCRuoepnlaptyaly c2:t &R a3t:ings for Re~lay1 31 :V85A AA 1 222055-0072 4VVW0aa cc V 1a530c000 00(-+ 2VV15AA00//,85 V- 4AAd5 c %33 (00+) 1VV 50dd0,cc /-6 2420588 %H WWz)
44.0 (1.73) UM AS/NZS N2e0tw81or:k2 0C®1o1m Ga4mCnFrodXuou 9Rnn m ed iEl caF3pyaa4inutl0iiglt8oa SE8nn9eqsnutsi:pinmgentRS1M-a8eed0rve0ii a-isTnlEi SoNCan-osF:k:U a S toEo n(1, -C8a0n0Da-e8dv3ai2c-e3N87e3t™)
MINIM1.97) A S / AEEN sFF Z sCC S o TT c S2--i18a0e,Rt 8ecEFd1t,Fi :EoEC 2FnqT0C u-612Tip 1,-C m9EoReFmFnC,t :pTE-lF2iaC6n,T tE-1F0CRTF-5 R CFu r EreFnCt TT-r6aRnsFf,o ErmFCerTs-7RF,
100.0 MINIMUM 50.0 ( OpOerpaetirnagti nCgu Trriemnet:: 5235.05050 A ms m smw smai tmxhinismaitmxauinummdmum PANEL THICKNESS
(3.94) 1.6 (0.06) TO 4.8 (0.19)
PANEL CUTOUT DETAIL TOP
PANEL-MOUNT CLAMP
COMMUNICATIONS
ADAPTER
ACCESS COVER
119.0 MAX 10.0
(4.68) (0.39) 96.0
(3.78)
43.9(1.73) 48.0(1.89)
CLAMP RETAINER
SIDE GROOVES FRONT

FIGURE 1. EL731 Outline and Mounting Details.
Page 4
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 6-F-032816

NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. SIDE VIEW SHOWN WITH 35 MM x 7.5 MM TOP-HAT RAIL.
112.0
(4.41)
21.2(0.83) (130.09.40) (01.24.70)
M4 OR 8-32 TAP
81.2(3.20) 60.0(2.36)
112.0
(4.41)
MOUNTING DETAIL BOTTOM VIEW
M4 OR 8-32 TAP CABLE-TIE EYELET
4 LOCATIONS 4 LOCATIONS
81.2 (3.20) 60.0(2.36)81.2(3.20)
121.9
(4.80) 100.0
125.4 (3.94)
(4.94)
SIDE VIEW FRONT VIEW

FIGURE 2. AC700-SMK Outline and Mounting Details.

1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 26
RST GND S21 S22 SH2 S11 S12 SH1 TC TB TA AB AA AA AB TA TB TC SH1 S12 S11 SH2 S22 S21GNDRST
13 12 11 10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 11 12 13
RREEMSOETTE CT2 CT1 RTD / PTC ANALOG OUT ANALOG OUT RTD / PTC CT1 CT2 RREEMSOETTE
RELAY 3 RELAY 2 RELAY 1 POWER POWER RELAY 1 RELAY 2 RELAY 3
26 25 24 23 22 21 20 19 18 17 16 15 14 14 15 16 17 18 19 20 21 22 23 24 25 26
K3 K2 K1 NC L2/N L1 L1 L2/N NC K1 K2 K3
PANEL MOUNTED SURFACE MOUNTED

FIGURE 3. Panel and Surface Mounting Connections.
Page 5
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 6-F-032816

NOTE 5
EFCT-X EFCT-X
Ø A
ADJUSTABLE-
Ø B SPEED
DRIVE
Ø C (ASD)
NEUTRAL-EARTHING
RESISTOR L1 L2/N
6 7 8 9 10 11 EFCT-X
+
NOTE 5 SH1 S12 S11 SH2 S22 S21 EARTHED
CT1 CT2 DC SYSTEM
14 15 -
L1 NOTE 3 L2/N
N
NOTE 6
19 K1 20 ASD 7 8
RUN
18 20
K2 FAULT EL731
22 21
DC CIRCUIT
23
K3 MONITORING
25 24
26
REMOTE 13 RST TC 5 TC PTC TC RTD
RESET 12 GND RTD/PTC TB 4 TB +tº TB tº
TA 3 TA TA
17 NC AB 2 +SUPPLY-
ANALOG
16 OUT 1 4-20 mA PGA-0520
AA
NOTES:
OPTIONAL NETWORK 1. CT CONNECTIONS ARE NOT POLARITY
COMMUNICATIONS SENSITIVE.
DISPLAY:
2 x 16 2. CT1 AND CT2 ARE INTERNALLY REFERENCED TO
ALPHANUMERIC TERMINAL 16. DO NOT CONNECT ADDITIONAL
OLED EARTHS TO CT1 OR CT2.
INDICATION 3. FREQUENCY RESPONSE OF CT1 IS DC TO 90 HZ
AND CT2 IS 20 TO 6,000 HZ. USE ONE OR BOTH
R TRIP INPUTS TO PROVIDE DESIRED FREQUENCY
Y ALARM RESPONSE. SEE SECTION 4.
G CT 4. RELAY CONTACTS SHOWN WITH THE EL731
DE-ENERGIZED.
EL731
5. ALTERNATE CT LOCATIONS.
6. IF AN EARTH-FAULT OCCURS IN THE RECTIFIER
PORTION OF AN ASD, THIS CONTROL SCENARIO
MIGHT BE INSUFFICIENT. TRIP THE CIRCUIT
BREAKER UPSTREAM FROM THE ASD.
FIGURE 4. Connection Diagram.
Page 6
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 6-F-032816

9 2)
0. 2
3 1.
(
TOP VIEW
6 6)
67. 2.6
(
131.7
(5.19)
FRONT VIEW SIDE VIEW
92.0
(3.62)
R=4.8 (0.19)
MAXIMUM
0 3)
4. 7
4 1.
( 160.0 MINIMUM
(6.30)
M
U
M
NI7)
MI2.8
0 (
3.
7
PANEL CUTOUT DETAIL
NOTES:
1. DIMENSIONS SHOWN IN MILLIMETRES (INCHES).
2. TIGHTENING TORQUE 0.02 N·M (0.18 LBF·IN).
3. POLYCARBONATE FRONT COVER CAN BE CLEANED USING WATER, METHANOL, OR ETHANOL.
FIGURE 5. AC700-CVR-00 Weatherproof Cover Outline.