![background image](http://html1.mh-extra.com/html/smc-networks/lecsa-series/lecsa-series_operation-manual_1299639085.webp)
-
83
-
7.2 Speed control mode
This mode allows for accurate, smooth control of the rotation speed and direction of the servo motor.
* To set [PC**], set parameter write restriction [PA19] to "00E".
7.2.1 Speed Control Mode Operation Instruction
The servo motor will rotate when signal ST1 and ST2 turn on. An operation example of the speed control mode is
shown below.
Internal speed command settings
Speed command and speed
The servo motor operates at the speed set in parameters.
Up to 8 speeds can be set to the internal speed command.
The following table indicates the rotation direction according to forward rotation start (ST1) and reverse rotation
start (ST2) combination.
(Note 1) Input device
(Note 2) Rotation direction
Forward rotation (CCW)
Reverse rotation (CW)
ST2
ST1
0
0
Stop (Servo lock)
0
1
Forward rotation (CCW)
1
0
Reverse rotation (CW)
1
1
Stop (Servo lock)
Note 1. 0: off
1: on
2. If the torque limit is canceled during servo lock, the servo
motor may suddenly rotate according to position deviation in
respect to the command position.
Connect the wirings as follows when operating in forward or reverse rotation with the internal speed command set
to the eighth speed.
Note that the inputs are configured as Current sink NPN Type
ST2
SP1
SP2
SP3
DOCOM
DICOM
24VDC
Servo amplifier
ST1
(Note 2)
(Note 1)
Refer to
“LECSA Operation Manual (Simplified Edition)”, section 5.5 for signal assignment.
(Note) Input device
Speed command value
SP3
SP2
SP1
0
0
0
Internal speed command 0 (parameter No. PC05)
Initial
phase
0
0
1
Internal speed command 1 (parameter No. PC06)
0
1
0
Internal speed command 2 (parameter No. PC07)
0
1
1
Internal speed command 3 (parameter No. PC08)
1
0
0
Internal speed command 4 (parameter No. PC31)
1
0
1
Internal speed command 5 (parameter No. PC32)
1
1
0
Internal speed command 6 (parameter No. PC33)
1
1
1
Internal speed command 7 (parameter No. PC34)
Note. 0:OFF
1:ON
8 patterns of speed configurations are available for LECSA.
LECSA Speed Command Parameter Setting
Driver
Assignment of signals in the initial setting
- LECSA: SP1
Assign signals "speed selection 2 (SP2) and
speed selection 3 (SP3) "when the driver is used
to [Internal speed command 7].
Forward rotation start
Peverse rotation start
Speed selection 1
Speed selection 2
Speed selection 3