ABB ACS 400 User Manual page 90

Code Description
3015 UNDERLOAD CURVE
This parameter provides five selectable curves shown in Figure 33. If the load drops below the set curve for
longer than the time set by parameter 3014, the underload protection is activated. Curves 1...3 reach
maximum at the motor rated frequency set by parameter 9907
Figure 32 Thermal protection trip times when parameters 3005
and 3007
CURVE ZERO SPEED LOAD
100
Figure 33 Underload curve types. T
motor.
80
I / I
O N
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0 0.2 0.4 0.6
I = output current
O
I = nominal current of the motor
N
f = output frequency
O
f = break point frequency (parameter 3008
BRK
have default values.
T
M
(%)
80
60
40
20
0
nominal torque of the motor,
M
MOTOR NOM FREQ
Trip time
60 s
90 s
180 s
300 s
600 s
∞
f / f
O
0.8 1.0 1.2
MOT THERM TIME
3
2
1
4
ƒ
N
.
BRK
)
BREAK POINT
, 3006
MOT LOAD
70 %
50 %
5
30 %
2.4 * ƒ
N
ƒ
nominal frequency of the
N
ACS 400 User's Manual