Chapter 6 Control Modes of Operation
ASDA-B2
6-14
Revision May, 2018
6.3 Speed Mode
Speed control mode (S or Sz) is applicable in precision speed control, such as CNC
machine tools. This servo drive includes two types of command input, analog and register.
Analog command input can use external voltage to control the motor speed. There are two
methods in register input. One is used before operation. Users set different value of speed
command in three registers, and then use SP0, SP1 of CN1 DI signal for switching.
Another method is to change the value of register by communication. In order to deal with
the problem of non-continuous speed command when switching register, a complete
S-curve program is provided. In close-loop system, this servo drive adopts gain adjustment
and integrated PI controller and two modes (manual and auto) for selection.
Users can set all parameters and all auto or auxiliary function will be disabled in manual
mode. While in auto mode, it provides the function of load inertia estimation and parameter
adjustment. In auto mode, parameters which set by users will be regarded as the default
value.
6.3.1 Selection of Speed Mode
There are two types of speed command source, analog voltage and internal parameters.
The selection is determined by CN1 DI signal. See as the followings.
Speed
Command
CN1 DI Signal
Command Source
Content
Range
SPD1 SPD0
S1 0
0
Mode
S
External
analog
signal
Voltage between
V-REF-GND
+/-10V
Sz N/A
Speed
command is 0
0
S2 0
1
Register parameter
P1-09
-50000 ~
50000
S3 1
0
P1-10
-50000 ~
50000
S4 1
1
P1-11
-50000 ~
50000
Status of SPD0 ~ SPD1: 0 means DI OFF, 1 means DI ON.
When both SPD0 and SPD1 are 0, if it is in Sz mode, the command will be 0.
Thus, if there is no need to use analog voltage as the speed command, Sz
mode can be applied to tackle the problem of zero-drift. If it is in S mode, the
command will be the voltage deviation between V-REF and GND. The range of
