ABB ACS800 Firmware Manual page 125

Par. 77.17
Par. 77.18
Par. 77.19
In this example, the empty hook current is considered in the range 10 ... 12 A, both
in the forward and reverse direction. The current in the load condition is considered
in the range 20 ... 25 A, both in the forward and reverse direction. In the empty hook
condition, the Load speed control function would allow the speed of 2000 rpm,
provided that the speed reference given is more than or equal to 2000 rpm, and the
speed is not limited by Par.
other speed limits. In the load condition, if the actual motor current at the base speed
is within the range of 20 ... 25 A, the Load speed control function will limit the speed
to 1300 rpm. Therefore, the functionality of two-speed control is achieved with these
settings.
The figure below shows the speed reference chain in Load speed control.
10.20
SPEED
LIMITER
IN
SPEED
EXT1/EXT2
0
REF IN SPEED REF
EXT 1 MIN
11.04
EXT 1 MAX
11.05
11.07
EXT 2 MIN
11.08
EXT 2 MAX
REF Y3 REV ------- 1300 rpm
CURR X4 REV ------- 25 A
REF Y4 REV ------- 1300 rpm
20.01
77.01
EXT SPD LIM PTR
SPEED
LIMITER
IN
EXT SPEED
0
LIMIT REF
MAX EXT
20.22
SPD LIM
MIN EXT
20.23
SPD LIM
Minimum speed or 20.02
LOAD SPD CTRL SEL
SPEED
LIMITER
IN
LOAD SPEED CTRL
0
LIMIT REF
Load Speed
Limit
Maximum speed or any
SPEED
LIMITER
IN
FINAL
0
SPEED REF
Minimum
20.01
speed
Maximum
20.02
speed
Program features
125