554 Appendix A - ACS380 in crane applications
Speed reference handling
The crane speed reference can be provided through any of the following sources:
• Joystick connected through digital and analog I/O
• PLC device connected to a fieldbus
• Pendant control connected to digital inputs or the step references
• Crane motor potentiometer.
Unipolar joysticks
Unipolar joysticks give the speed reference value with analog signal 0…10 V where 0
V is -maximum speed, 5 V is zero speed, and +10 V is +maximum speed. The
direction commands are specified with two digital inputs. For example, digital input
DI1 can be used for Start forward and DI2 for Start reverse.
Typically, for unipolar joysticks, parameters are set as follows:
Settings
Parameters:
12.17
AI1 min
,
12.18
AI1 max
,
12.19
AI1 scaled at AI1 min
,
12.20
AI1
scaled at AI1 max
,
22.11
Ext1 speed ref1
,
22.13
Ext1 speed function
Signals: -
Warnings: -
Faults: -
For control connection diagram, see
Control through the I/O interface using a joystick
on page
514
.
Parabolic speed reference
In general, joystick movements cause a linear change to the speed reference: a 50%
change in position gives a 50% speed reference.
Often, accurate load handling is needed in lower speed areas. For example, when the
end-user needs to position the load manually, or when the lack of space causes
limitations. In such situations, the end-user can control joystick movements more
accurately with a parabolic speed reference instead of a linear reference.
No.
Name
Value
12.17
AI1 min
0.000
12.18
AI1 max
10.000
12.19
AI1 scaled at AI1 min
-1500
12.20
AI1 scaled at AI1 max
1500
22.11
Ext1 speed ref1
AI1 scaled
22.13
Ext1 speed function
Abs (ref1)
ACS380 FW.book Page 554 Friday, May 4, 2018 4:18 PM
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