ABB ACH550-UH-011A-6 User Manual page 251

Code Description
3006 MOT THERM TIME
Sets the motor thermal time constant for the motor temperature model.
• This is the time required for the motor to reach 63% of the final
temperature with steady load.
• For thermal protection according to UL requirements for NEMA class
motors, use the rule of thumb:
where t6 (in seconds) is specified by the motor manufacturer as the
time that the motor can safely operate at six times its rated current.
• The 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.
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MOTOR THERM TIME
Motor load
Temp. rise
100%
63%
P 3006
ACH550-01 User's Manual
Range
256...9999 s
equals 35 times t6,
Parameter listing and descriptions
t
t