7.26
SEL-749M Relay Instruction Manual Date Code 20080918
Communications
SEL ASCII Protocol Details
Figure 7.10 shows the typical relay output for the STATUS S command,
showing available SEL
OGIC control equation capability.
=>>STA S
SEL-749M Date: 10/23/2004 Time: 13:37:18.276
MOTOR RELAY Time Source: internal
FID=SEL-749M-R102-V0-Z002002-D20041022 CID=3BB9
Available Capacity for SELOGIC Control Equations
Execution 91%
Settings (Group) 68%
Settings (Logic) 87%
Settings (Global) 81%
Settings (Report) 99%
Settings (Front Panel) 67%
=>>
Figure 7.10 Typical Relay Output for STATUS Command
STOP Command
The STO command causes the relay to trip, opening the motor contactor or
circuit breaker and stopping the motor. For further details refer to Figure 4.20.
STR Command
The STR command uses internal relay logic to initiate a motor start. For
further details refer to Section 4: Protection and Logic Functions.
SUMMARY Command
The SUM n command displays a summary list, in reverse chronological order,
of all the archived event summary reports (maximum of five events).
An example event summary report is in Figure 7.11. Each event summary
report shows the date, time, current magnitudes (primary values), frequency,
and, if the relay has the voltage option, voltage magnitudes (primary values).
The relay reports the voltage and current when the largest current occurs
during the event. The event summary report also shows the event type (e.g.,
OVERLOAD TRIP).
The n parameter with the SUM n command can have a value up to 5 and
defines the number of events requested. If n is not specified, then up to five of
the most recent reports are listed.
Ta b l e 7. 49 STO P Com m an d
Command Description Access Level
STO n Initiates user operation of an output to stop the motor. 2
Table 7.50 STR Command
Command Description Access Level
STR Initiates user operation of an output to start and run the
motor.
2
Ta b l e 7. 5 1 S U M M A RY Co m m a n d
Command Description Access Level
SUM Displays a summary list, in reverse chronological order,
of all archived event reports.
1
SUM R Use this command to clear the archive. 1
Courtesy of NationalSwitchgear.com
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