ABB ACS150 - Select

Actual signals and parameters
92
3005 MOT THERM PROT Selects how the drive reacts when motor overtemperature is detected.
The drive calculates the temperature of the motor on the basis of the
following assumptions:
1) The motor is in the ambient temperature of 30°C when power is applied to
the drive.
2) Motor temperature is calculated using either the user-adjustable (see
parameters 3006...3009) or automatically calculated motor thermal time
constant and motor load curve. The load curve should be adjusted in case
the ambient temperature exceeds 30°C.
1 = FAULT
0 = NOT SEL Protection is inactive.
1 = FAULT The drive trips on fault MOT OVERTEMP (code: F0009) when the
temperature exceeds 110°C, and the motor coasts to a stop.
2 = ALARM The drive generates alarm MOTOR TEMP (code: A2010) when the motor
temperature exceeds 90°C.
3006 MOT THERM TIME Defines the thermal time constant for the motor thermal model, i.e. the time
within 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
256…9999 s Time constant
3007 MOT LOAD CURVE Defines the load curve together with parameters 3008 ZERO SPEED LOAD
and 3009 BREAK POINT FREQ. If value is set to 100%, the maximum
allowed load is equal to parameter 9906 MOTOR NOM CURR value.
Load curve should be adjusted, if the ambient temperature differs from
nominal temperature.
100
50.…150% Allowed continuous motor load in percent of the nominal motor current
Parameters in the Long Parameter mode
Index Name/Selection Description Def
Temp. rise
100%
63%
t
t
}
Par. 3006
Motor load
f
150
100
50
Par. 3009
I = output current
I
N
= nominal motor current
I/I
N
Par. 3008
Par. 3007