ABB ACS560 - Page 290

290 Parameters
35.55 Motor thermal time
const
Defines the thermal time constant for use with the motor
thermal protection model, defined as the time to reach 63% of
the nominal motor temperature. See the motor
manufacturer's recommendations.
For thermal protection according to UL requirements for
NEMA class motors, use the rule of thumb: Motor thermal
time equals 35 times t6, where t6 (in seconds) is specified by
the motor manufacturer as the time that the motor can safely
operate at six time its rated current..
256 s
100…10000 s Motor thermal time constant. 1 = 1 s
35.56 Motor overload
action
Selects how the drive reacts when the motor reaches
overload condition.
Warning and
fault
No action None. 0
Warning only The drive generates an A783 Motor overload warning when
the motor is overloaded to the warning level, that is,
parameter 35.05 Motor overload level reaches value 88.0%.
1
Warning and fault The drive generates an A783 Motor overload warning when
the motor is overloaded to the warning level, that is,
parameter 35.05 Motor overload level reaches value 88.0%.
Drive trips on fault 7122 Motor overload when the motor is
overloaded to the fault level, that is, parameter 35.05 Motor
overload level reaches value 100.0%.
2
35.57 Motor overload
class
Selects the motor overload class to be used. The class of
protection is specified by the user as the time for tripping at
7.2 times (IEC 60947-4-1) or 6 times (NEMA ICS) the tripping
level current.
See section Motor overload protection on page 88.
Class 20
Class 5 Class 5 relay trip class 0
Class 10 Class 10 relay trip class 1
Class 20 Class 20 relay trip class 2
No. Name/Value Description Def/FbEq16
100%
63%
100%
Time
Time
Motor thermal time
Motor current
Temperature rise