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Misoperation prevention and parameter
setting restriction
4.18.2 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 parameters marked in the parameter list (page 64) can always be written, regardless of the operation
mode and operating 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.
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 operating status.
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 201.)
This parameter allows its setting to be changed during operation in any operation mode even if "0 (initial value) or 1" is set in Pr. 77 Parameter write
selection.
(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 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
296 Password lock level
297 Password lock/unlock
997 Fault initiation
(3) Write parameters during operation
(setting "2")
⋅ Parameters can always be written.
⋅ The parameters given on the right cannot be
written during operation if Pr. 77 = "2". Stop
operation when changing their parameter
settings.
Parameter
Number
Name
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
66 Stall prevention operation reduction starting frequency
71 Applied motor
79 Operation mode selection
80 Motor capacity
90 Motor constant (R1)
100 to 109 (Adjustable 5 points V/F parameter)
135 Electronic bypass sequence selection
136 MC switchover interlock time
137 Start waiting time
138 Bypass selection at a fault
139
Automatic switchover frequency from inverter to bypass
operation
178 to 196 (I/O terminal function selection)
329
Digital input unit selection (Parameter for the plug-in
option FR-A7AX)
800 Control method selection
998 IPM parameter initialization
999 Automatic parameter setting
♦ Parameters referred to ♦
Pr. 79 Operation mode selection Refer to page 206