ABB ACS355 series, User Manual

Page: 250 / 436

250 Actual signals and parameters
3005 MOT THERM
PROT
Selects how the drive reacts when the motor
overtemperature is detected. FAULT
NOT SEL Protection is inactive. 0
FAULT The drive trips on fault MOT OVERTEMP ( 0009 ) when the
temperature exceeds 110 °C, and the motor coasts to stop.
1
ALARM The drive generates alarm MOTOR TEMP ( 2010 ) when the
motor temperature exceeds 90 °C.
2
3006 MOT THERM
TIME
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. 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