GE 269Plus

GE Power Management 269Plus Motor Management Relay 3- 63
3 SETUP AND USE EMERGENCY RESTART
3
When in this mode, the 269Plus suspends all learning functions and stops updating the learned parameters on
Actual Values page 6 and the statistical parameters Actual Values page 4. Ensure that the 269Plus is returned
to normal running mode by changing the above setpoint to NO .
If it is desired to enable the "Start inhibit" after the first true start, the INITIAL START CAPACITY, TC REQUIRED (Set-
points page 5) can be programmed to match the LEARNED START CAPACITY, LAST START TC value. A few percent-
age points may be added to this value as a safety margin.
When the INITIAL START CAPACITY, TC REQUIRED setpoint is programmed, the 269Plus replaces the LEARNED
START CAPACITY REQUIRED value with it and uses it to calculate any lockout time that may be required before the
next start, where:
where:
SC
learned
= learned start capacity required
TC = thermal capacity used
SC = stopped cool time
3.23 EMERGENCY RESTART
When production or safety considerations become more important than motor protection requirements it may
be necessary to restart a faulted motor. Momentarily shorting together the Emergency Restart terminals will
discharge the thermal memory to 0% so that the relay can be reset after an OVERLOAD TRIP. In this way the
lock-out is avoided. The Emergency Restart feature will also reduce the relay's starts/hour counter by one each
time the terminals are shorted together, so that a STARTS/HOUR INHIBIT can be defeated.
When RTD input to thermal memory (see Setpoints page 5) is enabled and the Emergency Restart feature is
used, thermal capacity will be reduced to 0% only for as long as the Emergency Restart terminals are held
shorted(note:itmaytakeupto11secondsforthe THERMAL CAPACITY USED display to change to 0%). When
the Emergency Restart terminals are opened again, the thermal capacity will change to what is used according
to the maximum stator RTD temperature and Figure 3–8: POWER MEASUREMENT CONVENTIONS on page
3–67. Thus, momentarily shorting the Emergency Restart terminals with RTD input to thermal memory enabled
may not reduce the thermal capacity used to 0% when the motor is hot.
Shorting the Emergency Restart terminals together will have no effect unless the motor is stopped. Thus hav-
ing these terminals permanently shorted together will cause the memory to be cleared when the motor stops.
This will allow for an immediate restart after an OVERLOAD TRIP.
Caution is recommended in the use of this feature since the 269Plus thermal protective func-
tions will be overridden and it is possible to damage the motor if Emergency Restart is used.
All of the inhibits will be cleared if the Emergency Restart terminals are shorted.
Lockout Time
SC
learned
TC 100–+() SC ×
100
----------------------------------------------------------------------------
=
WARNING