Mitsubishi Electric 800 Series, Instruction Manual, Page: 145 / 727

Control method
144
PARAMETERS
 Keeping the motor speed constant when the load fluctuates (speed
control gain)
• Use Pr.89 to keep the motor speed constant during variable load operation.
(This parameter is useful to make adjustments on the motor speed after replacing a conventional model with an FR-A800
series model.)
 Driving two motors under Advanced magnetic flux vector control
• Turning ON the Second function selection (RT) signal enables the second motor operation.
• Set a second motor in
Pr.450 Second applied motor . (In the initial setting, "9999 (no second motor)" is selected. Refer to
page 423 .)
NOTE
• The RT signal is a second function selection signal. The RT signal also enables other second functions. (Refer to page 419 .)
RT signal is assigned to the terminal RT in the initial status. Set "3" in any of Pr.178 to Pr.189 (Input terminal function
selection) to assign the RT signal to another terminal.
• 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.
??????? Parameters referred to
Pr.71, Pr.450 Applied motor page 423
Pr.800, Pr.451 Control method selection page 137
Pr. Name
Initial
value Setting
range
Description
89
G932
Speed control gain
(Advanced magnetic flux
vector)
9999
0 to 200%
Makes adjustments to keep the motor speed constant during variable
load operation under Advanced magnetic flux vector control.
The reference value is 100%.
9999 The gain set by Pr.71. (The gain set in accordance with the motor.)
569
G942 Second motor speed
control gain
9999
0 to 200%
Makes adjustments to keep the second motor speed constant during
variable load operation under Advanced magnetic flux vector control.
The reference value is 100%.
9999 The gain set by Pr.450. (The gain set in accordance with the motor.)
Function RT signal ON (second motor) RT signal OFF (first motor)
Applied motor Pr.450 Pr.71
Motor capacity Pr.453 Pr.80
Number of motor poles Pr.454 Pr.81
Speed control gain (Advanced magnetic flux vector) Pr.569 Pr.89
Control method selection Pr.451 Pr.800
Load torque
Speed