Earth-leakage protection relay EL731 series

temperature1 NO/NCAC/DC

The EL731 series relay operates on ac resistance-grounded systems and dc grounded systems. This unit is a microprocessor-based ac, dc, sensitive, earth-leakage relay that offers complete coverage for all frequencies from 0–6,000 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 temperature sensor input allows over-temperature protection. The EL731 offers metering capabilities, password-protected alarm and trip settings, and optional network communications. The EL731 is used to add low-level ground-fault protection to variable-speed drives and to dc currents. Computer-to-Relay Connection Connect the EL731 to the network using a standard Ethernet patch cable. Use of a crossover cable to connect the EL731 directly to the computer running IP-Config is not recommended. A typical router will assign an IP address to all connected computers that are using DHCP. The EL731 does not support the use of DHCP. If the EL731 is being set up for first time, it is recommended to only have one EL731 connected to the network to prevent communication errors. Features Adjustable pickup (30–5,000 mA) Frequency range (0–90 Hz, 20–6,000 Hz) 32-character OLED display Local LED indication CT-loop monitoring Analog output (4–20 mA) Adjustable time delay Alarm and trip settings Temperature sensor input Output contacts