Parameter Setting Procedure For Tension Sensorless Torque Control - Mitsubishi Electric A800 Plus Series Function Manual

6.4
Parameter setting procedure for tension
sensorless torque control
The following procedure shows the parameter setting example for the tension sensor feedback torque control.
6.4.1
Parameter setting procedure
1
Wiring
Perform secure wiring.
NOTE
• Do not feed the workpiece through the machine.
2
Control method selection
Select the control method according to the application and the motor.
Pr.
71 Applied motor
9 Electronic thermal O/L relay
80 Motor capacity
81 Number of motor poles
83 Rated motor voltage
84 Rated motor frequency
800 Control method selection
803 Constant output range torque characteristic selection
807 Speed limit selection
810 Torque limit input method selection
359 Encoder rotation direction
369 Number of encoder pulses
707 Motor inertia (integer)
724 Motor inertia (exponent)
862 Encoder option selection
∗1
For the control method, vector control is recommended.
∗2 Setting is required for a motor other than a Mitsubishi Electric motor (the SF-PR, SF-JR, SF-HR, SF-JRCA, SF-HRCA, or SF-V5RU (1500 r/min
series) motor).
NOTE
• Torque control is not available in a low-speed (about 10 Hz or lower) regenerative range, or with a low speed and light load
(about 5 Hz or lower and rated torque about 20% or lower). Vector control must be selected.
• For the parameter details, refer to the FR-A800 Instruction Manual (Detailed).
3
Speed limit setting
Set the speed limit as required as follows.
Speed limit value =
NOTE
• Use Pr.807 to Pr.809 and Pr.1113 to set the speed limit. As the speed limit value is overwritten frequently, set "0" in Pr.342
Communication EEPROM write selection to enable RAM write. For the parameter details, refer to the FR-A800 Instruction
Manual (Detailed).
4
Torque characteristic setting
Set "1" in Pr.803 to make the torque characteristic constant for the tension command in the low-speed range and
in the constant output range.
5
Offline auto tuning
Perform offline auto tuning as required. For offline auto tuning, refer to
Pr.
96 Auto tuning setting/status
After the offline auto tuning, perform the test run of the motor alone to make sure that no fault is found in the
motor's behavior.

Parameter setting procedure for tension sensorless torque control

Name
∗1
∗2
∗2
Present line speed
π × Present diameter × Gear ratio
Name
TENSION SENSOR FEEDBACK TORQUE CONTROL
× 1.1 to 1.2
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