Mitsubishi Electric 800 Series Instruction Manual page 145

Control method
Keeping the motor speed constant when the load fluctuates (speed
control gain)
Pr. Name
Speed control gain
89
(Advanced magnetic flux
G932
vector)
569 Second motor speed
G942 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.)
Function
Applied motor
Motor capacity
Number of motor poles
Speed control gain (Advanced magnetic flux vector) Pr.569
Control method selection
NOTE
• The RT signal is a second function selection signal. The RT signal also enables other second functions. (Refer to
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
Pr.800, Pr.451 Control method selection
144
PARAMETERS
Initial Setting
value range
0 to 200%
9999
9999
0 to 200%
9999
9999
Speed
RT signal ON (second motor)
Pr.450
Pr.453
Pr.454
Pr.451
page 423
page 137
Description
Makes adjustments to keep the motor speed constant during variable
load operation under Advanced magnetic flux vector control.
The reference value is 100%.
The gain set by Pr.71. (The gain set in accordance with the motor.)
Makes adjustments to keep the second motor speed constant during
variable load operation under Advanced magnetic flux vector control.
The reference value is 100%.
The gain set by Pr.450. (The gain set in accordance with the motor.)
RT signal OFF (first motor)
Pr.71
Pr.80
Pr.81
Pr.89
Pr.800
page 419.)