ABB ACS880 Firmware Manual page 542

542 Parameters
No. Name / Range /
Selection
Quadratic
User curve
79.42 Overload
supervision signal
NULL
AI1 scaled
AI2 scaled
FB A ref1
FB A ref2
EFB ref1
EFB ref2
Estimated motor
current
Motor current %
Other [value]
79.43 Overload limit
0.00 ... 30000.00
79.47 Overload delay type
Constant
Linear
Quadratic
Description
Underload limit is calculated by using the formula:
2
I = I * (F / F )
lim set act max
Where,
I = 79.90 Overload actual limit
lim
I = 79.43 Overload limit
set
F = 79.09 Load limit speed scale
max
= Actual speed
F
act
Overload limit depends on the user input load curve,
actual speed/frequency and Overload supervision input.
Defines the source for the supervision signal used in
the overload protection.
Zero
12.12 AI1 scaled value (page
12.22 AI2 scaled value (page
3.5 FB A reference 1 (page
3.6 FB A reference 2 (page
3.9 EFB reference 1 (page
3.10 EFB reference 2 (page
Parameter 9.13 Motor current
Estimated motor current in % of nominal motor current.
See Terms and abbreviations (page
Defines overload limit value.
Note: This parameter is not applicable in case User
curve is selected for the overload curve shape in
parameter 79.41 Overload limit
Overload fixed limit.
Selects the type of overload delay time setting.
The user has option to choose between fixed and
floating delay calculation methods.
Overload limit depends on the user input load curve,
actual speed/frequency and Overloadload supervision
input.
T = T * (I / I )
act set lim act
Where,
T = 79.91 Overload trip count down
act
T = 79.48 Overload delay time
set
I = 79.90 Overload actual limit
lim
I = 79.42 Overload supervision signal
act
2
T = T * (I / I )
act set lim act
Where,
T = 79.91 Overload trip count down
act
T = 79.48 Overload delay time
set
I = 79.90 Overload actual limit
lim
I = 79.42 Overload supervision signal
act
226).
228).
179).
179).
179).
179).
estimated.
169).
type.
Def / Type
FbEq 16b / 32b
2
3
Motor current % /
unit32
0
1
2
4
5
8
9
7
8
100.00 / real32
10 = 1 / 100 = 1
Constant / unit32
0
1
2