214 Actual signals and parameters
FAULT The drive trips on fault MOT OVERTEMP when the
temperature exceeds 110 °C, and the motor coasts to stop.
Note: Because motor thermal protection has memory
retention, do not shut down the drive when a MOT
OVERTEMP fault occurs. Shutting down the drive does not
reset the fault. The drive resets the fault as soon as the
motor temperature has lowered enough.
1
ALARM The drive generates alarm MOTOR TEMP when the motor
temperature exceeds 90 °C.
2
3006 MOT THERM
TIME
Defines the thermal time constant for the motor thermal
model, that is, the time within which the motor temperature
has reached 63% of the nominal temperature with steady
load.
For thermal protection according to UL requirements for
NEMA class motors, use the rule of thumb: Motor thermal
time = 35 · t6. t6 (in seconds) is specified by the motor
manufacturer as the time the motor can safely operate at six
times its rated current.
Thermal time for a Class 10 trip curve is 350 s, for a Class
20 trip curve 700 s, and for a Class 30 trip curve 1050 s.
500 s
256…9999 s Time constant 1 = 1 s
All parameters
No. Name/Value Description Def/FbEq
}
Motor load
Temp. rise
100%
63%
Par. 3006
t
t
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