Signal Loss Detection Of Encoder Signals - Mitsubishi Electric FR-A820-00046 Instruction Manual

(C) Motor constant parameters
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.
Tab. 5-201: Related Parameters
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.
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
Pr. 71
Pr. 80
Pr. 81
Pr. 96
Pr. 178 to Pr. 189
Pr. 190 to Pr. 196
Pr. 800
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.
376
C148
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).
5 - 486
Pr. Description
450 Applicable motor
Motor capacity (with the rated motor current equal to or lower than the inverter rated current)
453
454 Number of motor poles
Electronic thermal O/L relay
Applied motor
Motor capacity
Number of motor poles
Auto tuning setting/status
(input terminal function selection)
(output terminal function selection)
Control method selection
Pr. Name
855
Encoder signal loss detection
enable/disable selection
C248
=>
=>
=>
=>
=>
=>
=>
=>
V/F V/F V/F Magnetic flux Vector Magnetic flux Magnetic flux Vector Vector
Initial Setting
Description
value range
0 Signal loss detection disabled
0
1 Signal loss detection enabled
Parameters
page 5-303
page 5-451
page 5-61, page 5-72,
page 5-471
page 5-61, page 5-72,
page 5-471
page 5-72, page 5-471
page 5-439
page 5-378
page 5-61