ABB +N5600 Firmware Instructions page 431

No. Name/Value
Quadratic
User curve
79.12 Underload
supervision signal
NULL
AI1 scaled
AI2 scaled
FBA1 ref
FBA2 ref
EFB1 ref
EFB2 ref
Estimated motor
current
Motor current %
Other
79.13 Underload limit
0.00...30000.00
79.17 Underload delay
type
Constant
Linear
Quadratic
79.18 Underload delay
time
0.0...30000.00 s
Description
Underload limit is calculated by using the formula:
2
I = I * (F / F )
lim set act max
Where,
I = 79.80 Underload actual limit
lim
I = 79.13 Underload limit
set
F = 79.09 Load limit speed scale
max
F = Actual speed
act
Underload limit depends on the user input load curve, actual
speed/frequency and Underload supervision input.
Defines the source for the supervision signal used in the
underload protection.
Zero
12.12 AI1 scaled value (see page 197).
12.22 AI2 scaled value (see page 199).
03.05 FB A reference 1
03.06 FB A reference 2
03.09 EFB reference 1 (see page 156).
03.10 EFB reference 2 (see page 156).
Parameter 09.13 Motor current estimated
Estimated motor current in % of nominal motor current.
Source selection (see Terms and abbreviations
Defines underload limit value.
Note: This parameter is not applicable in case User curve is
selected for the underload curve shape in parameter
Underload limit type.
Underload fixed limit.
Selects the type of underload delay time setting.
The user has option to choose between fixed and floating
delay calculation methods.
Fixed constant value of the delay.
T = T * (I / I )
act set act lim
Where,
T = 79.81 Underload trip count down
act
T = 79.18 Underload delay time
set
I = 79.80 Underload actual limit
lim
I = 79.12 Underload supervision signal
act
2
T = T * (I / I )
act set act lim
Where,
T = 79.81 Underload trip count down
act
T = 79.18 Underload delay time
set
I = 79.80 Underload actual limit
lim
I = 79.12 Underload supervision signal
act
Defines the time used as on-delay for the underload
protection function to react to the underload condition.
Underload delay time in seconds.
(see page 156).
(see page 156).
(see page 183).
on page 148). -
Parameters 431
Def/FbEq16
Motor current
%
0
1
2
3
4
5
6
7
8
0.00
79.11
10 = 1
Constant
10.0
1 = 1s