5.5
Date Code 20080918 Instruction Manual SEL-749M Relay
Metering and Monitoring
Motor Operating Statistics
Motor Operating Statistics
The SEL-749M retains useful machine operating statistics information for the
protected motor.
Use the serial port MOTOR command and the front-panel
MONITOR menu to
view motor operating statistics. The data also appear in the Modbus memory
map and are available at the optional DeviceNet port. You can reset the data
using either a communications port (e.g., serial port MOTOR R command) or
the front-panel
MONITOR menu. Items included in the report are shown in the
Figure 5.4.
=>>MOT <Enter>
SEL-749M Date: 02/27/2007 Time: 11:30:03.024
MOTOR RELAY Time Source: internal
Operating History (elapsed time in ddd:hh:mm) Since: 11/17/2003 17:21:54
Running Time 0:00:02
Stopped Time > 0:02:18
Time Running 2.1%
Number Of Starts 2
Number Of Emergency Starts 0
Average Peak
Start Time (s) 9.1 9.3
Max Start I (A) 1079 1152
Min Start V (V) 4113 4111
Start % TCU 91.8 93.6
Running % TCU 90.9 93.8
Running Cur (A) 224.9 242.2
Running kW 1362 1467
Running kVARin 854.3 922.7
Running kVARin 854.3 922.7
Running kVA 1607 1732
Alarms Trips
Overload 0 0
Locked Rotor 0 0
Undercurrent 0 0
Jam 0 0
Current Imbal 0 0
Overcurrent 0 0
Ground Fault 0 0
Speed Switch 0 0
Undervoltage 0 0
Overvoltage 0 0
Underpower 0 0
Power Factor 0 0
Reactive Power 0 0
Phase Reversal 0
Underfrequency 0 0
Overfrequency 0 0
Start Timer 0
Remote Trip 0
Other Trips 0
Total 0 0
=>>
Figure 5.4 MOTOR Command Example
NOTE: While the relay power is off,
the elapsed timers do not advance. If
relay power is off for a significant
amount of time, the elapsed calendar
time will not match the elapsed time
recorded by the relay
NOTE: The relay records motor
operating statistics every six hours to
nonvolatile memory.
If the power is
removed from the relay, the relay will
lose the information collected
between the last save and the time of
the power removal.
Courtesy of NationalSwitchgear.com
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