ABB ACS880 Firmware Manual page 521

No. Name / Range /
Selection
74.30 Speed observer
enable
Not selected
Selected
DI1
DI2
DI3
DI4
DI5
DI6
DIO1
DIO2
ESP CW bit 2
Other [bit]
74.31 Restart speed limit
low
-598.00 ... 0.00 Hz
74.32 Restart speed limit
high
0.00 ... 598.00 Hz
74.33 Observer speed
check time
0.0 ... 32000.0 s
Description
Defines the source for Backspin speed observer
function enable signal.
For further information on Backspin speed observer
function, see section Backspin speed observer .
The function detects whether the motor is spinning
and prevents drive start command until passive motor
speed reduces down to speed region defined as safe
to restart by the user.
ABB recommends to always enable the restart delay
and run for at least several minutes alongside with the
backspin speed observer function.
Backspin speed observer function is disabled.
Backspin speed observer function is enabled.
Digital input DI1 (10.2 DI delayed
Digital input DI2 (10.2 DI delayed
Digital input DI3 (10.2 DI delayed
Digital input DI4 (10.2 DI delayed
Digital input DI5 (10.2 DI delayed
Digital input DI6 (10.2 DI delayed
Digital input/output DIO1
0).
Digital input/output DIO2
1).
Parameter 74.1 ESP control word (page
controls enable/disable status of the function.
See Terms and abbreviations (page
Defines top negative speed at which fly-start operation
is permitted.
Together with parameter
safe-to-restart speed region is formed.
Restart speed limit low.
Defines top positive speed at which fly-start operation
is permitted.
Together with parameter
safe-to-restart speed region is formed.
Restart speed limit high.
Defines the time period required for the motor speed
measured by the Backspin speed observer function to
stay within the safe-to-restart speed region before
user-start command is permitted.
Observer speed check time.
status, bit 0).
status, bit 1).
status, bit 2).
status, bit 3).
status, bit 4).
status, bit 5).
(11.2 DIO delayed status, bit
(11.2 DIO delayed status, bit
519), bit 2 status
169).
74.32 Restart speed limit
74.31 Restart speed limit
Parameters 521
Def / Type
FbEq 16b / 32b
ESP CW bit 2 / unit32
0
1
2
3
4
5
6
7
10
11
12
-7.00 Hz / real32
high,
10 = 1 Hz / 100 = 1 Hz
7.00 Hz / real32
low,
10 = 1 Hz / 100 = 1 Hz
30.0 s / real32
10 = 1 s / 1 = 1 s