GE M60 Instruction Manual page 410
Motor protection system
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Also See for M60:
- Instruction manual (612 pages) ,
- Communications manual (532 pages) ,
- Communications manual (526 pages)
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GROUPED ELEMENTS
Motor cooling is calculated as follows.
where
TCU = thermal capacity used
TCU
= TCU value caused by overload condition
start
TCU
= TCU value dictated by the hot/cold curve ratio when the motor is running. This value is 0 when the motor is
end
stopped)
t = time in minutes
τ
= cool time constant (running or stopped per current motor status and corresponding
COOL TIME CONSTANT STOPPED
I
= equivalent motor heating current
eq
overload_pickup = overload pickup setpoint as a multiple of FLA
hot / cold = hot/cold curve ratio
5
5-202
settings)
COOL TIME CONSTANT RUNNING
M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
Eq. 5-14
Eq. 5-15
and
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