7.18
SEL-749M Relay Instruction Manual Date Code 20080918
Communications
SEL ASCII Protocol Details
METER T (Thermal and RTD Metering)
The MET T command displays the temperatures of any connected RTDs.
This command also shows the average motor current (xFLA), the present
% Thermal Capacity used, and the RTD % Thermal Capacity (if ambient and
winding temperatures are monitored and a winding RTD trip temperature is
set). To view the thermal meter values k times, use the MET T k command as
described in METER k (Instantaneous Metering) on page U.7.17.
If the motor is in overload, this command response shows the calculated time
to a thermal trip. If the motor is not in overload (such as in the example in
Figure 5.2), the time shown is 9999 seconds. The relay also displays starts
available and time to reset.
MOTOR Command
The MOT command displays motor operating statistics including the
following:
➤ Motor running time, stopped time, and percent time running.
➤ Total number of motor starts.
➤ Number of emergency starts.
Section 5: Metering and Monitoring includes additional details on the motor
operating statistics report. Issuing the MOT R or MOT C command from
Access Level 2 clears the report.
Table 7.29 METER T (Thermal and RTD Metering)
Command Description Access Level
MET T Displays the instantaneous thermal data for the
induction machine.
1
Table 7.30 MOTOR Command
Command Description Access Level
MOT Display machine operating statistical monitoring of
the protected device
1
MOT C Use this command to clear/reset the motor statistic
records
2
MOT R Use this command to clear/reset the motor statistic
records
2
Courtesy of NationalSwitchgear.com
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