ABB ACS880 Firmware Manual page 539

No. Name / Range /
Selection
Linear
Quadratic
79.18 Underload delay
time
0.00 ... 30000.00 s
79.19 Underload event
reaction
Not selected
Warning
Warning with
shutdown
Fault
URT Recovery -
Warning
URT Recovery - Fault
79.21 Underload curve
point 1
Description
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.
Defines response to the underload condition.
If the underload supervision signal stays under active
underload limit as long as set in defined delay time,
then the underload protection function triggers the
reaction defined in this parameter setting.
Underload event reaction is inactive.
Underload condition triggers the drive event D205
Underload warning. It will stay on as long as underload
condition is present. Warning will automatically
disappear if underload supervision signal stays above
the underload limit for the time defined in parameter
79.18 Underload delay
Underload condition triggers the drive event D205
Underload warning and immediate stop command.
Drive will stop according to parameter
setting.
Underload condition triggers the drive event D102
Underload fault which immediately trips the drive.
Underload condition triggers the underload ride
through recovery sequence. In case recovery routine
helps, motor speed returns to production speed. If not,
drive generates the event D205 Underload warning. It
will stay on as long as underload condition is present.
Warning will automatically disappear if underload
supervision signal stays above the underload limit for
the time defined in parameter
time.
Underload condition triggers the underload ride
through recovery sequence. In case recovery routine
helps, motor speed returns to production speed. If not,
drive generates the D102 Underload (page 691)
which immediately trips the drive.
Defines underload curve point 1 load limit active at
corresponding speed set in parameter
speed point 1.
time.
21.3 Stop mode
79.18 Underload delay
79.01 Load curve
Parameters 539
Def / Type
FbEq 16b / 32b
1
2
10.00 s / real32
1 = 1 s / 10 = 1 s
Warning / unit32
0
1
2
3
4
5
fault
0.00 / real32