Mitsubishi Electric FR-A800 Series Instruction Manual page 230

 Keeping the motor speed constant when the load fluctuates (speed
control gain)
Pr.
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 applied motor) is selected.
Refer to page
Applied motor
Motor capacity
Number of motor poles
Speed control gain (Advanced magnetic flux
vector)
Control method selection
NOTE
• The RT signal is a Second function selection signal. The RT signal also enables other second functions. (Refer to
The RT signal is assigned to the terminal RT in the initial status. Set "3" in one 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
Pr.800, Pr.451 Control method
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Initial
Name
value
9999
9999
Speed
528.)
Function RT signal-ON (second motor)
Pr.450
Pr.453
Pr.454
Pr.569
Pr.451
motorpage 528
selectionpage 221
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Setting
range
Makes adjustments to keep the motor speed constant during variable load
0 to 200% 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.)
Makes adjustments to keep the second motor speed constant during
0 to 200% 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.)
Pr.71
Pr.80
Pr.81
Pr.89
Pr.800
Description
RT signal-OFF (first motor)
1
2
3
4
5
6
7
8
9
10
page 525.)
229
5. PARAMETERS
5.2 Control method