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Chapter 6 Control Modes of Operation|ASDA-AB Series
Revision January 2009 6-13
6.3 Speed Control Mode
The speed control mode (S or Sz) is usually used on the applications of precision speed control, such as
CNC machine, etc. ASDA-AB series servo drive supports two kinds of command sources in speed control
mode. One is external analog signal and the other is internal parameter. The external analog signal is from
external voltage input and it can control the speed of servo motor. There are two usage of internal parameter,
one is set different speed command in three speed control parameters before operation and then using
SPD0 and SPD1 of CN1 DI signal perform switching. The other usage is using serial communication to
change the setting value of parameter.
Beside, in order to make the speed command switch more smoothly, ASDA-AB series servo drive also
provides complete S-curve profile for speed control mode. For the closed-loop speed control, ASDA-AB
series servo drive provides gain adjustment function and an integrated PI or PDFF controller. Besides, two
modes of tuning technology (Manual/Auto) are also provided for the users to select (parameter P2-32).
There are two turning modes for gain adjustment: Manual and Auto modes.
Manual Mode: User-defined loop gain adjustment. When using this mode, all auto and auxiliary
function will be disabled.
Auto Mode: Continuous adjustment of loop gains according to measured inertia, with ten levels of
system bandwidth. The parameter set by user is default value.
6.3.1 Command Source of Speed Control Mode
Speed command Sources:
1) External analog signal: External analog voltage input, -10V to +10V
2) Internal parameter: P1-09 to P1-11
CN1 DI signal
Speed
Command
SPD1 SPD0
Command Source Content Range
S
External
analog signal
Voltage between V-
REF-GND
+/-10 V
S1 0 0 Mode
Sz N/A
Speed command is
0
0
S2 0 1 P1-09 0~5000r/min
S3 1 0 P1-10 0~5000r/min
S4 1 1
Internal parameter
P1-11 0~5000r/min
State of SPD0~1: 0: indicates OFF (Normally Open); 1: indicates ON (Normally Closed)
When SPD0 and SPD1 are both = 0 (OFF), if the control mode of operation is Sz, then the
speed command is 0. Therefore, if the users do not use analog voltage as speed command, the
users can choose Sz mode and avoid the zero point drift problem of analog voltage signal. If the
speed control mode is S mode, then the command is the analog voltage between V-REF and