Mitsubishi Electric MELSERVO MR-J2-A Product Specifications And Installation Manual page 107

3.WIRING
(2) Speed control mode1
1) Speed setting
a. Speed command and speed
The servo motor is run at the speeds set in parameters No. 8 to 10 (internal speed com-
mands 1 to 3) or at the speed set in the applied voltage of the analog speed command
(VC). A relationship between the analog speed command (VC) applied voltage and the
servo motor speed is shown in Fig. 3-4. The rotation directions determined by the forward
rotation start signal (ST1) and reverse rotation start signal (ST2) are indicated in Table 3-
2.
CW direction
Fig. 3-4 VC Applied Voltage vs. Speed (ST1=ON)
Table 3-2 ST1/ST2 and Rotation Directions
Across
ST1-SG
Open
Short
Open
Short
b. Connection diagram
Generally connect as shown in Fig. 3-5. When a precision speed command is required,
connect as shown in Fig. 3-6. In this case, the temperature fluctuation of the command
voltage is ±0.002%/°C. Note that as the maximum value of the command voltage is approx.
+6V, adjust the maximum value with parameter No. 25.
2kΩ
Japan Resistor
RRS10 or equivalent
Fig. 3-5 Connection Example 1
Rated speed
Speed
[r/min]
-10
0
VC applied voltage [V]
Rated speed
Across
Analog speed command (VC)
ST2-SG
+ polarity
Stop
Open
(Servo lock)
CCW
Open
CW
Short
Stop
Short
(Servo lock)
Servo amplifier
SP1
SP2
SG
P15R
2kΩ
VC
LG
SD
[r/min]
CCW direction
Forward
+10
rotation
CCW
Rotation Direction
0V - polarity
Stop Stop
(Servo lock) (Servo lock)
CW
Stop
(No servo lock)
CCW
Stop
Stop
(Servo lock)
(Servo lock)
1/2W
860kΩ
NEC
15V
1SZ52 or
2kΩ
equivalent
Japan Resistor
RRS10 or equivalent
Fig. 3-6 Connection Example 2
3– 22
Reverse
rotation CW
Internal speed
commands 1 to 3
Stop
(Servo lock)
CCW
CW
Stop
(Servo lock)
Servo amplifier
VC
LG
SD