ABB ACS 800 Series, Firmware Manual

Page: 125 / 340

Program features
125
Par. 77.17 REF Y3 REV ------- 1300 rpm
Par. 77.18 CURR X4 REV ------- 25 A
Par. 77.19 REF Y4 REV ------- 1300 rpm
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.
20.01 Minimum speed or 20.02 Maximum speed or any
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.
11.07
IN
0
11.08
SPEED
LIMITER
IN
0
MAX EXT
SPD LIM
MIN EXT
SPD LIM
SPEED
LIMITER
EXT 1 MIN
EXT 1 MAX
EXT 2 MIN
EXT 2 MAX
SPEED
REF IN
EXT1/EXT2
SPEED REF
EXT SPEED
LIMIT REF
EXT SPD LIM PTR
10.20
11.05
11.04
20.23
20.22
SPEED
LIMITER
IN
0
Load Speed
SPEED
LIMITER
IN
0
Minimum
speed
Maximum
speed
Limit
LOAD SPD CTRL SEL
77.01
LOAD SPEED CTRL
LIMIT REF
20.02
20.01
FINAL
SPEED REF