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

Page: 688 / 1218

(C) Motor constant parameters Parameters
5 - 486
Tuning the second applied motor (Pr. 574)
When switching two different motors by one inverter, set the second motor in Pr. 450 "Second applied
motor". (In the initial setting, no second motor is applied. (Refer to page 5-451.))
Pr. 574 is enabled when the Second function selection (RT) signal is turned ON.
If a motor with substantially low rated current compared with the inverter rated current is used,
speed and torque accuracies may deteriorate due to torque ripples, etc. Set the rated motor current
to about 40% or higher of the inverter rated current.
5.13.5 Signal loss detection of encoder signals
If encoder signals are disconnected during encoder feedback control, orientation control or vector
control, Signal loss detection (E.ECT) is turned ON to shut off the inverter output.
The setting is available only when a vector control compatible is mounted.
The parameter number is the one for use with the plug-in option (FR-A8AP/FR-A8APR).
The parameter number is the one for use with the control terminal option (FR-A8TP).
Pr. Description
450 Applicable motor
453
Motor capacity (with the rated motor current equal to or lower than the inverter rated current)
454 Number of motor poles
Tab. 5-201: Related Parameters
NOTES The RT signal is a second function selection signal. The RT signal also enables other second func-
tions. (Refer to page 5-439.)
The 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. 9 Electronic thermal O/L relay => page 5-303
Pr. 71 Applied motor => page 5-451
Pr. 80 Motor capacity =>
page 5-61, page 5-72,
page 5-471
Pr. 81 Number of motor poles =>
page 5-61, page 5-72,
page 5-471
Pr. 96 Auto tuning setting/status => page 5-72, page 5-471
Pr. 178 to Pr. 189 (input terminal function selection) => page 5-439
Pr. 190 to Pr. 196 (output terminal function selection) => page 5-378
Pr. 800 Control method selection => page 5-61
Pr. Name
Initial
value
Setting
range
Description
376
C148
855
C248
Encoder signal loss detection
enable/disable selection
0
0 Signal loss detection disabled
1 Signal loss detection enabled
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux Vector Vector Vector