Protection Relays and Controls Earth-Leakage ProtectionGrounded AC or DC Systems EL731 SERIES AC/DC Sensitive Earth-Leakage Relay Description The EL731 is a microprocessor-based AC/DC Sensitive Earth-Leakage Relay that offers complete coverage for all frequencies from 0 to 6,000 Hz. Two CTs are required for the entire frequency range, or one CT can be used for only low- or high-frequency detection. An RTD/PTC sensor input allows over-temperature protection for a motor or drive. The EL731 offers metering, password-protected alarm and trip settings and optional network communications. It is primarily used to add low-level ground-fault protection to variable-speed drives, Simplified Circuit Diagram and to dc circuits. A A CT1 CT2 A A CT1 GROUNDED + AC SUPPLY B GROUNDED DC SUPPLY C EL731 SERIES EL731 SERIES (AC/DC Sensitive (AC/DC Sensitive L1 Earth-Leakage Relay) L1 Earth-Leakage Relay) L2 L2 AC Mode DC Mode For detailed wiring diagram, see adjacent page. Accessories Ordering Information EFCT Series Earth-Fault Current A CONTROL Transformer ORDERING NUMBER COMMUNICATIONS POWER Required zero-sequence current transformer specifically designed for low level detection. EL731-00-X0 120/240 Vac/Vdc None EL731-01-X0 120/240 Vac/Vdc DeviceNet AC700-CUA Series EL731-02-X0 120/240 Vac/Vdc Profibus Communication Adapter Optional network-interface and firmware- EL731-03-X0 120/240 Vac/Vdc EtherNet/IP upgrade communications adapters field-install EL731-04-X0 120/240 Vac/Vdc Modbus TCP in EL731. EL731-10-X0 48 Vdc & 24 Vac None AC700-SMK DIN-rail & Surface-mount Adapter EL731-11-X0 48 Vdc & 24 Vac DeviceNet EL731 plugs into adapter for back-plane EL731-12-X0 48 Vdc & 24 Vac Profibus mounting. EL731-13-X0 48 Vdc & 24 Vac EtherNet/IP ACCESSORIES REQUIREMENT EL731-14-X0 48 Vdc & 24 Vac Modbus TCP EFCT Series CT One Required EL731-20-X0 24 Vdc None AC700-CUA Series Com. Unit Optional EL731-21-X0 24 Vdc DeviceNet AC700-SMK Surface-Mount Kit Optional AC700-CVR-00 Watertight Cover (IP66) for EL731-22-X0 24 Vdc Profibus Optional Panel-Mount Applications EL731-23-X0 24 Vdc EtherNet/IP PGA-0520 Analog Meter Optional EL731-24-X0 24 Vdc Modbus TCP Note: When building a part number, replace the X with 1 for AS/NZS 2081:2011 Compliant product, 0 otherwise. 2016 Littelfuse Protection Relays & Controls Rev: 4-F-040716 Littelfuse.com/el731 Based on Manual Rev 6-F-031116Protection Relays and Controls Earth-Leakage ProtectionGrounded AC or DC Systems EL731 SERIES AC/DC Sensitive Earth-Leakage Relay Features & Benefits FEATURES BENEFITS Adjustable pickup (30-5,000 mA) Adjustable trip setting provides a wide range of low-level protection and system coordination Frequency range (0-90 Hz, 20-6,000 Hz) Operate in either AC or DC mode or both. Use single or combined ranges. Separate metering 32-char OLED display Earth-leakage metering, setup and programming Local LED indication Visual Trip, Alarm, CT connection indication CT-Loop monitoring Alarms when CT is not connected Analog output (4-20 mA) Connect to DCS. Allows connection to an optional meter (PGA-0520) or control system Adjustable time delay Adjustable trip delay for quick protection and system coordination Alarm and trip settings Detect a deteriorating condition before damage occurs Temperature-sensor input Drive or motor temperature protection Output contacts 3 programmable: Operate 2 alarm and 1 trip circuit Network communication Optional connection to plant network Harmonic filtering Eliminates nuisance tripping due to harmonic noise Microprocessor based No required calibration saves maintenance cost Universal power supply Provides flexibility for numerous applications Wiring Diagram Specifications IEEE Device Numbers AC ground fault (50G/N, 51G/N), LINE 1 LINE 2/N OPTIONAL DC ground fault (79G), NETWORK COMM PTC overtemperature (49), 14 L1 L2/N 15 RTD temperature (38, 49) GND AC/DC SENSITIVE 16 Supply Voltage 120/240 Vac/Vdc, 24 Vdc, EARTH-LEAKAGE RELAY 48 Vdc/24 Vac EL731 K1 20 Trip Level Settings 30-5,000 mA AC and DC FAULT 19 Alarm Level Settings 30-5,000 mA AC and DC 18 Trip Delay 0.05-2 s K2 21 Output Contacts 3 Form C (programmable) 22 Contact Operating Mode Fail-safe & non-fail-safe 23 Reset Front panel and remote K3 24 Freq. Response, CT1 0-90 Hz 25 Freq. Response, CT2 20-6,000, 190-6,000, 20-90, 20-3,000 Hz 26 selectable 11 S21 NC EFCT-X 20-6000 HZ CT 17 Current Transformer EFCT-x series 10 S22 CT Detection Open & short detection PTC RTD TC 5 TC TC 9 SH2 Terminals Plug-in, wire clamping, t 2 24 to 12 AWG (0.2-2.5 mm ) RTD/PTC TB 4 TB TB +t 8 S11 Communications EtherNet/IP, DeviceNet, Profibus , TA TA TA EFCT-X 3 DC-90 HZ CT Modbus TCP (optional) 7 S12 Analog Output 4-20 mA (selectable 0-5 A or SUPPLY SH1 6 AB + 2 0-100% trip-level setting) ANALOG PGA-0520 4-20mA Conformal Coating Standard feature OUT RST 13 AA 1 REMOTE Dimensions H 48 mm (1.9) W 96 mm (3.8) RESET D 129 mm (5.0) 12 GND Approvals UL Listed (E340889), CSA, RCM (Australia), CE Warranty 5 years Mounting Panel Surface and DIN (with optional AC700-SMK) Littelfuse reserves the right to make product changes, without notice. Material in this document is as accurate as known at the time of publication. Visit Littelfuse.com for the most up-to-date information. 2016 Littelfuse Protection Relays & Controls Rev: 4-F-040716 Littelfuse.com/el731 Based on Manual Rev 6-F-031116