ACQ550-U1 User’s Manual 143
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.
If you want to emulate the behavior of an old underload curve with parameters as in
the shaded columns, set the new parameters as in the white columns in the two
tables below:
3713 LOAD FREQ 4
Defines the frequency value of the fourth load curve definition point.
• Must be smaller than 3716
LOAD FREQ 5
3714 LOAD TORQ LOW 4
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
Defines the torque value of the fourth overload curve definition point.
3716 LOAD FREQ 5
Defines the frequency value of fifth load curve definition point.
3717 LOAD TORQ LOW 5
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
Defines the torque value of the fifth overload curve definition point.
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 t122 · t
Code Description
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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