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3. SIGNALS AND WIRING
(3) Speed limit
(a) Speed limit value and speed
The speed is limited to the values set in parameters No. PC05 to PC08 and PC31 to PC34 (Internal
speed limit 0 to 7).
When the servo motor speed reaches the speed limit value, the internal torque control may become
unstable. Make the set value more than 100r/min greater than the desired speed limit value.
The following table indicates the limit direction according to forward rotation selection (RS1) and reverse
rotation selection (RS2) combination.
(Note) Input device
Speed limit direction
Forward rotation (CCW)
Reverse rotation (CW)
RS1 RS2
1 0 Forward rotation (CCW)
0 1 Reverse rotation (CW)
Note. 0: off
1: on
Connect the wirings as follows when setting the internal speed limit to the eighth speed.
SP2
SP3
DOCOM
DICOM
Servo amplifier
SP1
24VDC
(Note 2)
RS2
RS1
(Note 1)
Note 1. For sink I/O interface. For source I/O interface, refer to section 3.8.3.
2. Set the input devices by parameter No. PD02 to PD14.
POINT
The servo-on (SON), the forward rotation stroke end (LSP), and the reverse
rotation stroke end (LSN) can be set to turn on automatically by parameter
No. PD01 (input signal automatic ON selection 1).
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