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4.4 Speed control
Speed control is applied where precise speed control is required. It
’s can
also be configured by the upper device.
Speed
command
source and
direction
Speed
command
ramp function
Speed
command
limit
Speed
command
filtering
Speed loop
control
Current
loop control
Torque feed
forward
Speed
calculation
M
Input speed
command
Motor
Encoder
feedback
+
+
-
+
-
Figure 4-3 The speed control diagram
Parameters related to the speed commands
Table 4-4 The parameters related to the speed commands
Para
meter
Name
Set value
Factory
default
Description
PA4
Control mode
9
0
Set to speed control
PA15
Speed command
direction setting
xxx0xb
00000b
PA22
Speed command
source selection
Appropriate
value
1
1, internal parameter
PA27 input
2, analog AI1 input
PA27
Internal speed
command 1
Appropriate
value
0
Unit, rpm
PA40
ACC time
constant
Appropriate
value
20
Time to accelerate
from zero speed to
maximum speed (ms)