Emergency Restart - GE 269Plus Instruction Manual

Motor management relay

Table of Contents

3 SETUP AND USE

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

If it is desired to enable the "Start inhibit" after the first true start, the

points page 5) can be programmed to match the

age points may be added to this value as a safety margin.

When the

I N I T I A L S T A R T C A P A C I T Y , T C R E Q U I R E D

S T A R T C A P A C I T Y R E Q U I R E D

next start, where:

Lockout Time

where:

learned

TC = thermal capacity used

SC = stopped cool time

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

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: it may take up to 11 seconds for the

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.

WARNING

All of the inhibits will be cleared if the Emergency Restart terminals are shorted.

GE Power Management

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value with it and uses it to calculate any lockout time that may be required before the

(

)

TC 100

learned

100

= learned start capacity required

269Plus Motor Management Relay

N O

I N I T I A L S T A R T C A P A C I T Y , T C R E Q U I R E D

L E A R N E D S T A R T C A P A C I T Y , L A S T S T A R T T C

setpoint is programmed, the 269Plus replaces the

can be defeated.

S T A R T S / H O U R I N H I B I T

T H E R M A L C A P A C I T Y U S E D