YASKAWA SGD7S

6.5 Speed Control
6.5.1 Basic Settings for Speed Control
6-17
6
Application Functions
Relation between the /SPD-D (Motor Direction Input) Signal
and V-REF (Speed Reference Input) Signal
The following graphs show the relationship between the V-REF (Speed Reference Input) signal
and the speed reference depending on whether the /SPD-D signal is ON or OFF.
/SPD-D (Motor Direction Input) Signal: OFF /SPD-D (Motor Direction Input) Signal: ON
Speed Reference Input Example
If Pn300 is set to 600, the motor would operate at the rated speed for 6.00 V.
0+12-12
Motor speed [min
-1
]
Speed reference
voltage [V]
0+12-12
Motor speed [min
-1
]
Speed reference
voltage [V]
Example
• For Rotary Servomotors
• Linear Servomotors
Speed Ref-
erence Input
/SPD-D
Signal
Rotation
Direction
Motor
Speed
For SGM7A Servomotor
+6 V
ON Reverse
Rated
motor
speed
-3000 min
-1
OFF Forward
3000 min
-1
-3 V
ON Forward
1/2 of rated
motor
speed
1500 min
-1
OFF Reverse
-1500 min
-1
+1 V
ON Reverse
1/6 of rated
motor
speed
-500 min
-1
OFF Forward
500 min
-1
Speed Ref-
erence Input
/SPD-D
Signal
Rotation
Direction
Movement
Speed
For SGLGW-30A Linear
Servomotor
+6 V
ON Reverse Rated
motor
speed
-1500 mm/s
OFF Forward 1500 mm/s
-3 V
ON Forward 1/2 of rated
motor
speed
750 mm/s
OFF Reverse -750 mm/s
+1 V
ON Reverse 1/6 of rated
motor
speed
-250 mm/s
OFF Forward 250 mm/s