SEL-701-1 Monitor
Date Code 20011009
SEL
OGIC®
Control Equations and Monitor Logic
Start and Emergency Restart Logic
B.28
In an emergency, it may be necessary to quickly start the motor even though a
protection lockout condition exists and is holding the TRIP output contact asserted.
The lockout might be a result of the thermal element or another protection function
(see
). You can override all the lockout conditions using
the Emergency Restart function.
The monitor asserts the Emergency Restart Relay Word bit (EMRSTR) in
response to any of these conditions:
The EMRSTR Control Equation result is true (logical 1).
You execute the front-panel menu Emergency Restart command.
The monitor receives a Modbus Emergency Restart control command.
When the Emergency Restart Relay Word bit asserts, the monitor:
Resets the motor thermal element capacity used to 0%.
Manipulates the Starts-Per-Hour, Minimum Time Between Starts,
and Antibackspin functions to permit an immediate start.
Deasserts the TRIP output contact if no fault detecting element is
picked up.
Initiates a motor start through the logic shown in
.
NOTE:
For the EMRSTR SEL
OGIC
control equation performance
to match the performance of the front-panel and Modbus
Emergency Restart functions, you should include * STOPPED
in the SEL
OGIC
control equation, as shown in
. Do not set EMRSTR =1.
Program an Output Contact for Motor Starting
In the factory settings, the result of the start logic in
is routed to output
contact OUT3 with the following SEL
OGIC
control equation:
Equation B.5
OUT3
START
=
Содержание SEL-701-1
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