
266 Parameter listing and descriptions
ACH550-01 User's Manual
Correspondence with the obsolete underload supervision
The now obsolete parameter 3015
UNDERLOAD CURVE provided
five selectable curves shown in the figure below.
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.
If you want to emulate the behaviour of an old underload curve
with parameters as in the shaded columns, set the new
parameters as in the white columns in the tables.
Underload
supervision with
parameters
3013…3015
(obsolete)
Obsolete parameters New parameters
3013
UNDERLOAD
FUNCTION
3014
UNDERLOAD
TIME
3701
USER LOAD
C MODE
3702
USER LOAD
C FUNC
3703
USER LOAD
C TIME
No underload
functionality
0 -0--
Underload curve,
fault generated
1 t11t
Underload curve,
alarm generated
2 t 1 2 2 · t
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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