Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 255

NOTE
• The speed feed forward control is enabled for the first motor.
• Even if the driven motor is switched to the second motor while Pr.877 = "1", the second motor is operated as Pr.877 = "0".
• Under PM sensorless vector control, the notch filter is available when low-speed range high-torque characteristic is enabled
by Pr.788 Low speed range torque characteristic selection ="9999 (initial value)". (Refer to
 Model adaptive speed control (Pr.877 = "2", Pr.828, Pr.1119)
• The model speed of the motor is calculated, and the feedback is applied to the speed controller on the model side. Also,
this model speed is set as the command of the actual speed controller.
• The inertia ratio of Pr.880 is used when the speed controller on the model side calculates the torque current command
value.
• The torque current command of the speed controller on the model side is added to the output of the actual speed controller,
and set as the input of the iq current control.
Pr.828 is used for the speed control on the model side (P control), and first gain Pr.820 is used for the actual speed
controller.
• The model speed control gain can be set in the per-unit (pu) system in Pr.1119.
• In the per-unit system:
When "1" is set, the torque (Iq) command is 100% (rated Iq) when the speed deviation is 100%.
When "1" is set, the torque (Iq) command is 100% (rated Iq) when the speed deviation is 100%.
Set the 100% speed in Pr.1121 Per-unit speed control reference frequency.
[Block diagram]
Model adaptive speed control
+
Speed command
-
NOTE
• The model adaptive speed control is enabled for the first motor.
• Even if the driven motor is switched to the second motor while Pr.877 ="2", the second motor is operated as Pr.877 = "0".
• Under PM sensorless vector control, the notch filter is available when low-speed range high-torque characteristic is enabled
by Pr.788 Low speed range torque characteristic selection ="9999 (initial value)". (Refer to
• Under model adaptive speed control, because the appropriate gain values for the model and actual loop sections are based
on the response that was set for easy gain tuning, when raising the response level, Pr.818 Easy gain tuning response level
setting must be re-evaluated (raised).
• The per-unit system setting(Pr.1119) is available only under Real sensorless vector control or Vector control.
• When the speed control P gain or model speed control gain is set in the per-unit system, the easy gain tuning selection
(Pr.819 = "1 or 2") becomes invalid.
254
5. PARAMETERS
5.3 Speed control under Real sensorless vector control, vector control, PM sensorless vector control
J
Torque coefficient
(J: [Pr. 880] )
Model speed
1
control gain
J s
[Pr. 828]
Model speed
calculation
Speed control
+
P gain 1
- [Pr. 820]
Speed control
Actual speed controller
integral time 1
[Pr. 821]
page 227.)
+
+
Torque
M
control
+
Speed
estimator
page 227.)