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Correspondence with the obsolete underload supervision
The now obsolete parameter 3015
five selectable curves shown in the figure below.
T
M
(%)
Underload curve types
80
60
40
20
0
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 protection is activated.
•
Curves 1...3 reach maximum at the motor rated frequency
set by parameter 9907
•
T
= nominal torque of the motor.
M
•
ƒ
= nominal frequency of the motor.
N
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
Obsolete parameters
supervision with
parameters
UNDERLOAD
3013...3015
FUNCTION
(obsolete)
No underload
functionality
Underload curve,
fault generated
Underload curve,
alarm generated
272
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ƒ
UNDERLOAD TIME
MOTOR NOM FREQ
3013
3014
UNDERLOAD
TIME
0
-
1
t
2
t
Parameter listing and descriptions
ACH550-01 User's Manual
UNDERLOAD CURVE
3
2
1
4
N
(obsolete), the
.
New parameters
3701
3702
USER LOAD
USER LOAD
C MODE
C FUNC
0
-
1
1
1
2
provided
70%
50%
5
30%
f
2.4 · ƒ
N
3703
USER LOAD
C TIME
-
t
2 · t
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