Date Code 20080918 Instruction Manual SEL-749M Relay
Section 5
Metering and Monitoring
Instructi on Manual
Overview
The SEL-749M Motor Protection Relay includes metering functions to
display the present values of current, voltage (if included), and RTD
measurements (with an external SEL-2600 RTD module). The relay provides
the following methods to read the present meter values:
➤ Front-panel rotating display
➤ Front-panel menu
➤ EIA-232 serial ports (using SEL ASCII text commands or
ACSELERATOR QuickSet
®
SEL-5030 Software
➤ Modbus
®
via Port 3 or Port 4
➤ DeviceNet™ port
➤ Analog output
For monitoring and preventive maintenance purposes, the SEL-749M provides
a motor operating statistics report, available using either the front panel, the
serial port, or the optional DeviceNet port.
Also helpful in preventive maintenance tasks, the SEL-749M calculates and
stores motor starting information. The relay retains motor start reports for the
five latest motor starts. The motor start trending function stores motor start
averages for the last eighteen 30-day periods.
Metering
The SEL-749M meter data fall into the following categories:
➤ Fundamental metering
➤ Thermal metering
➢ Thermal model metering
➢ RTD metering (with an external SEL-2600 RTD
module)
Table 5.1
details each of the meter data types in the SEL-749M. Section 8:
Front-Panel Operations and Section 7: Communications describes how to
access the various types of meter data by using the relay front-panel and
communications ports.
Courtesy of NationalSwitchgear.com
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