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Misoperation prevention and parameter
setting restriction
4
PARAMETERS
4.17.2 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 62) 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.
(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 operating status.
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 190.)
Pr. 77 can be always set independently of the operation mode and operating 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 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
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)
414 PLC function operation selection
415 Inverter operation lock mode setting
570 Multiple rating setting
♦ Parameters referred to ♦
Pr. 79 Operation mode selection Refer to page 195