Parameter Write Selection (Pr. 77) - Mitsubishi Electric FR-F720-00046 Instruction Manual

Misoperation prevention and parameter
setting restriction

4.17.2 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
Number
77 Parameter write selection
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 179.)
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 parameters marked in the parameter list (page 61)
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.
(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".
(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
23
48
49
60
66
71
79
80
90
100 to 109
135
136
137
138
139
178 to 196
255
256
257
258
329
343
563
564
570
♦ Parameters referred to ♦
Pr. 79 Operation mode selection
178
Name Initial Value
0
Stall prevention operation level compensation factor at double speed
Second stall prevention operation current
Second stall prevention operation frequency
Energy saving control selection
Stall prevention operation reduction starting frequency
Applied motor
Operation mode selection
Motor capacity(Simple magnetic flux vector control)
Motor constant (R1)
(Adjustable 5 points V/F parameter)
Electronic bypass sequence selection
MC switchover interlock time
Start waiting time
Bypass selection at a fault
Automatic switchover frequency from inverter to bypass operation
(I/O terminal function selection)
Life alarm status display
Inrush current limit circuit life display
Control circuit capacitor life display
Main circuit capacitor life display
Digital input unit selection (Parameter for the plug-in option FR-A7AX)
Communication error count
Energization time carrying-over times
Operating time carrying-over times
Multiple rating setting
Refer to page 181
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.
can always be written, regardless of the operation
Parameter
Number
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
Name
Description
Name