ABB ACS355 series User Manual page 250

250 Actual signals and parameters
All parameters
No. Name/Value
3005 MOT THERM
PROT
NOT SEL
FAULT
ALARM
3006 MOT THERM
TIME
256...9999 s
Description
Selects how the drive reacts when the motor
overtemperature is detected.
Protection is inactive.
The drive trips on fault
temperature exceeds 110 °C, and the motor coasts to stop.
The drive generates alarm
motor temperature exceeds 90 °C.
Defines the thermal time constant for the motor thermal
model, ie, 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.
Motor load
Temp. rise
100%
63%
Time constant
MOT OVERTEMP (0009) when the
MOTOR TEMP (2010) when the
Par. 3006
Def/FbEq
FAULT
0
1
2
500 s
t
t
1 = 1 s