1-148 ACH550-UH User’s Manual
Parameters
Correspondence with the obsolete underload supervision
The now obsolete parameter 3015
UNDERLOAD CURVE provided five selectable
curves shown in the figure. The parameter characteristics were as described below.
• If the load drops below the
set curve for longer than
the time set by parameter
3014
UNDERLOAD TIME
(obsolete), the underload
protection is activated.
• Curves 1…3 reach
maximum at the motor
rated frequency set by
parameter 9907
MOTOR
NOM FREQ.
• T
M
= nominal torque of the
motor.
•ƒ
N
= nominal frequency of
the motor.
3711 LOAD TORQ LOW 3 0…600% 1% 25%
Defines the torque value of the third underload curve definition point.
• Must be smaller than 3712 LOAD TORQ HIGH 3.
3712 LOAD TORQ HIGH 3 0…600% 1% 300%
Defines the torque value of the third overload curve definition point.
3713 LOAD FREQ 4 0…500 Hz 1 Hz 50 Hz
Defines the frequency value of the fourth load curve definition point.
• Must be smaller than 3716
LOAD FREQ 5
3714 LOAD TORQ LOW 4 0…600% 1% 30%
Defines the torque value of the fourth underload curve definition point.
• Must be smaller than 3715
LOAD TORQ HIGH 4.
3715 LOAD TORQ HIGH 4 0…600% 1% 300%
Defines the torque value of the fourth overload curve definition point.
3716 LOAD FREQ 5 0…500 Hz 1 Hz 500 Hz
Defines the frequency value of fifth load curve definition point.
3717 LOAD TORQ LOW 5 0…600% 1% 30%
Defines the torque value of the fifth underload curve definition point.
• Must be smaller than 3718
LOAD TORQ HIGH 5.
3718 LOAD TORQ HIGH 5 0…600% 1% 300%
Defines the torque value of the fifth overload curve definition point.
Group 37: User Load Curve
Code Description Range Resolution Default S
80
60
40
20
0
2.4 · ƒ
N
3
2
1
5
4
T
M
70%
50%
30%
ƒ
N
(%)
Underload curve types
f
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