Parameter Write Selection (Pr. 77) - Mitsubishi Electric FR-A720-00030-NA Instruction Manual

4.22.2 Parameter write selection (Pr. 77)

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
Name
Number
77 Parameter write selection
Pr. 77 can be always set independently of the operation mode and operating status.
(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 69) can always be written, regardless of the operation mode and
operating status. However, Pr. 72 PWM frequency selection, Pr. 240 Soft-PWM operation selection and Pr. 275 Stop-on
contact excitation current low-speed multiplying factor can be written during operation in the PU operation mode, but
cannot be written in External operation mode.
(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".
(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.
Parameter
Number
Stall prevention operation level compensation
23
factor at double speed
48 Second stall prevention operation current
49 Second stall prevention operation frequency
60 Energy saving control selection
61 Reference current
Stall prevention operation reduction starting
66
frequency
71 Applied motor
79 Operation mode selection
80 Motor capacity
81 Number of motor poles
82 Motor excitation current
83 Rated motor 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)
291 Pulse train I/O selection
292 Automatic acceleration/deceleration
293 Acceleration/deceleration separate selection
Parameters referred to 
Pr. 79 Operation mode selection
Initial Value
0
Parameter
Number
160
296
297
Name
Refer to page 321
Misoperation prevention and parameter
Setting
Range
0 Write is enabled only during a stop.
1 Parameter write is not enabled.
Parameter write is enabled in any operation
2
mode regardless of operating status.
22 Stall prevention operation level
75 Reset selection/disconnected PU detection/PU stop selection
77 Parameter write selection
79 Operation mode selection
User group read selection
Password lock level
Password lock/unlock
Parameter
Number
Digital input unit selection
329
(Parameter for the plug-in option FR-A7AX)
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
Frequency command sign selection (CC-Link)
541 (Parameter for the plug-in option FR-A7NC/
FR-A7NCE)
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
setting restriction
Description
Name
Name
315
4