298
Misoperation prevention and parameter
setting restriction
4.22.2 Parameter write selection (Pr. 77)
(1) Write parameters only at a stop (setting "0", initial value)
⋅ Parameters can be written only during a stop in the PU operation mode.
⋅ The shaded parameters in the parameter list (page 65) can always be written, regardless of the operation mode and
operation status. However, Pr. 72 PWM frequency selection and Pr. 240 Soft-PWM operation selection can be written
during operation in the PU operation mode, but cannot be written in external operation mode.
(3) Write parameters during operation (setting "2")
⋅ Parameters can always be written.
⋅ The following parameters cannot be written during operation if Pr. 77 = "2". Stop operation when changing their
parameter settings.
You can select whether write to various parameters can be performed or not. Use this function to prevent
parameter values from being rewritten by misoperation.
Parameter
Number
Name Initial Value
Setting
Range
Description
77 Parameter write selection 0
0 Write is enabled only during a stop.
1 Parameter write is not enabled.
2
Parameter write is enabled in any operation
mode regardless of operation status.
Pr. 77 can be always set independently of the operation mode and operation status.
(2) Disable parameter write (setting "1")
⋅Parameter write is not enabled. (Reading is
enabled.)
⋅Parameter clear and all parameter clear cannot
be performed, either.
⋅The parameters given on the right can be written
even if Pr. 77 = "1".
Parameter
Number
Name
22 Stall prevention operation level
75
Reset selection/disconnected PU detection/PU stop selection
77 Parameter write selection
79 Operation mode selection
160 User group read selection
♦ Parameters referred to ♦
Pr. 79 Operation mode selection Refer to page 301
Parameter
Number
Name
19 Base frequency voltage
23
Stall prevention operation level compensation
factor at double speed
48 Second stall prevention operation current
49 Second stall prevention operation frequency
60 Energy saving control selection
61 Reference current
66
Stall prevention operation reduction starting
frequency
71 Applied motor
79 Operation mode selection
80 Motor capacity
81 Number of motor poles
82 Motor excitation current
83 Motor rated voltage
84 Rated motor frequency
90 to 94 (Motor constants)
95 Online auto tuning selection
96 Auto tuning setting/status
100 to 109 (Adjustable 5 points V/F parameter)
135 to 139 (Parameter for electronic bypass sequence)
178 to 196 (I/O terminal function selection)
255 Life alarm status display
256 Inrush current limit circuit life display
257 Control circuit capacitor life display
258 Main circuit capacitor life display
291 Pulse train I/O selection
292 Automatic acceleration/deceleration
293 Acceleration/deceleration separate selection
329
Digital input unit selection
(Parameter for the plug-in option FR-A7AX)
343 Communication error count
414 PLC function operation selection
415 Inverter operation lock mode setting
450 Second applied motor
451 Second motor control method selection
453 Second motor capacity
454 Number of second motor poles
455 Second motor excitation current
456 Rated second motor voltage
457 Rated second motor frequency
458 to 462 (Second motor constant)
463 Second motor auto tuning setting/status
541
Frequency command sign selection (CC-Link)
(Parameter for the plug-in option FR-A7NC)
563 Energization time carrying-over times
564 Operating time carrying-over times
570 Multiple rating setting
574 Second motor online auto tuning
800 Control method selection
819 Easy gain tuning selection
858 Terminal 4 function assignment
859 Torque current
860 Second motor torque current
868 Terminal 1 function assignment
Parameter
Number
Name
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