Mitsubishi Electric FR-A800 Series Instruction Manual page 261

• To input the X44 signal, set "44" in any of Pr.178 to Pr.189 (Input terminal function selection) to assign the function to
a terminal.
• The shock of P/PI control switchover is absorbed by setting Pr.1115 Speed control integral term clear time. When the
X44 signal is turned ON, integration is stopped and the accumulated integral term is reduced and cleared according to the
setting of Pr.1115 Speed control integral term clear time (initial value is 0 ms).
In Pr.1115, set time when the integral term is reduced from 100% to 0% regarding the rated torque current (Iq) as 100%.
Turning OFF the X44 signal resumes the integral operation.
[Function block diagram]
Speed
command
NOTE
• Changing the terminal assignment using Pr.178 to Pr.189 (Input terminal function selection) may affect the other functions.
Set parameters after confirming the function of each terminal.
• The speed loop integration can be disabled at the emergency stop using Pr.1349 Emergency stop operation selection.
(Refer to
 P/PI control switchover according to the motor speed (Pr.1348)
• When the motor speed falls below the Pr.1348 setting during speed control under Real sensorless vector control or Vector
control, speed loop integration is stopped and the accumulated integral term is cleared.
Pr.1348 setting or more: PI control
Less than the Pr.1348 setting: P control
• The shock of P/PI control switchover is absorbed by setting Pr.1115 Speed control integral term clear time. When the
motor speed falls below the Pr.1348 setting, speed loop integration is stopped and the accumulated integral term is
reduced and cleared according to the Pr.1115 setting (initial value is 0 ms). In Pr.1115, set time when the integral term is
reduced from 100% to 0% regarding the rated torque current (Iq) as 100%. When the motor speed is increased to the
Pr.1348 setting plus 2 Hz or more, integral operation is resumed.
NOTE
• The speed loop integration can be disabled at the emergency stop using Pr.1349 Emergency stop operation selection.
(Refer to
260
5. PARAMETERS
5.3 Speed control under Real sensorless vector control, vector control, PM sensorless vector control
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Speed
command
Speed
+
proportional
operation
-
page 367.)
page 367.)
search engine
+
X44-OFF
Speed
integral
operation
Integral term
reduction
0
X44-ON
Torque
control
+
Speed estimator
M