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3. SIGNALS AND WIRING
(3) Speed setting in speed control mode
(a) Speed command and speed
The servo motor is run at the speed set in parameter No. 8 (internal speed command 1) or at the
speed set in the applied voltage of the analog speed command (VC). A relationship between analog
speed command (VC) applied voltage and servo motor speed and the rotation directions determined
by the forward rotation start signal (ST1) and reverse rotation start signal (ST2) are as in (a), (1) in
section 3.4.2.
Generally, make connection as shown below:
SD
1k
Ω
2k
Ω
Servo amplifier
Japan Resistor
RRS10 or equivalent
LG
VC
P15R
SG
SP1
When a precision speed command is required, refer to (a), (1) in section 3.4.2
(b) Speed selection 1 (SP1) and speed command value
Use speed selection 1 (SP1) to select between the speed set by the internal speed command 1 and
the speed set by the analog speed command (VC) as indicated in the following table:
(Note) External Input Signals
SP1
Speed Command Value
0
Analog speed command (VC)
1
Internal speed command 1 (parameter No. 8)
Note. 0: SP1-SG off (open)
1: SP1-SG on (short)
The speed may also be changed during rotation. In this case, it is increased or decreased according
to the value set in parameter No. 11 or 12.
When the internal speed command 1 is used to command the speed, the speed does not vary with
the ambient temperature.
(c) Speed reached (SA)
As in Section 3.4.2 (2).
