YASKAWA Varispeed G7 Series Instruction Manual page 370

Setting the Speed/Torque Control Switching Timer
The delay between a change in the speed/control switching function input (ON to OFF or OFF to ON) and the
corresponding change in the control method can be set in d5-06. During the timer delay, the value of the 3 ana-
log inputs will retain the values they had when the ON/OFF status of speed/torque control switching signal
was changed. Use this delay to complete any changes required in external signals.
Application Precautions
The frequency reference (during speed control) is set in b1-01. The speed limit during torque control is set
•
in d5-03.
If the torque reference has been assigned to a multi-function analog input, terminal A2, or terminal A3, the
•
input function changes when the control method is switched between torque control and speed control.
During speed control: The multi-function analog input terminal is used as the torque limit input.
During torque control: The multi-function analog input terminal is used as the torque reference input.
When the Run Command turns OFF, the control method when stopped will be for speed control. Even
•
from the torque control method, the system will automatically change to speed control and decelerate to a
stop when the Run Command turns OFF.
When A1-02 (control method selection) is set to 3 (flux vector control), the speed/torque change command
•
(a setting of 71) can be set for a multi-function input (H1-01 to H1-10) to switch between speed and torque
control during operation. An example is shown below.
Terminal No. User Constant No.
S8
A1
A3
A timing chart for switching between speed and torque control is shown in the following figure.
Speed/torque change signal
(terminal S8 input)
Stop
Run Command
Control mode
Speed
Speed
reference
Terminal A1 input
Torque limit
Terminal A3 input
Factory Setting
H1-06 8
b1-01 1
d5-03 1
H3-05 0
CLOSED
OPEN
Run
Torque Speed
Speed limit
Speed
reference
Torque limit
Torque
reference
Fig 6.72 Speed/Torque Control Switching Time Chart.
Setting
71 Speed/torque control change
Frequency reference selection
1
(terminals A1, A2)
1 Speed limit (terminals A1, A2)
13 Torque reference/torque limit
CLOSED
OPEN
Torque
Speed limit
Torque
reference
Individual Functions
Function
Speed (decel to stop)
137
6-