Select - ABB ACS150 User Manual

92
Parameters in the Long Parameter mode
Index Name/Selection
3005 MOT THERM PROT
0 = NOT SEL
1 = FAULT
2 = ALARM
3006 MOT THERM TIME
256...9999 s
3007 MOT LOAD CURVE
50....150%
Actual signals and parameters
Description
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.
Protection is inactive.
The drive trips on fault MOT OVERTEMP (code: F0009) when the
temperature exceeds 110°C, and the motor coasts to a stop.
The drive generates alarm MOTOR TEMP (code: A2010) when the motor
temperature exceeds 90°C.
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.
Motor load
Temp. rise
100%
63%
Time constant
Defines the load curve together with parameters
and 3009 BREAK POINT FREQ. If value is set to 100%, the maximum
allowed load is equal to parameter
Load curve should be adjusted, if the ambient temperature differs from
nominal temperature.
I/I
N
150
100
Par. 3007
50
Par. 3008
Allowed continuous motor load in percent of the nominal motor current
Par. 3006
3008 ZERO SPEED LOAD
9906 MOTOR NOM CURR value.
I = output current
I = nominal motor current
N
f
Par. 3009
Def
1 = FAULT
500
t
t
100