Parameter Write Disable Selection (Pr. 77) - Mitsubishi Electric FR-D720-0.4K Instruction Manual

Misoperation prevention and parameter setting restriction

4.17.2 Parameter write disable 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 parameter can be set when Pr. 160 Extended function display selection = "0". (Refer to page 163)
Pr. 77 can always be set independently from the operation mode and operation status.
(1) Write parameters only during 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 58) 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 when the
inverter is running in the PU operation mode, but cannot be written in the External operation mode.
(2) Inhibit parameter write (setting "1")
Parameter write is not enabled.
(Read 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 when the inverter is running even if Pr. 77 = "2". Stop the inverter when
changing their parameter settings.
Parameter
Number
Stall prevention operation level compensation
23
factor at double speed
40 RUN key rotation direction selection
48 Second stall prevention operation current
60 Energy saving control selection
Stall prevention operation reduction starting
66
frequency
71 Applied motor
79 Operation mode selection
80 Motor capacity
82 Motor excitation current
Parameters referred to
Pr. 79 Operation mode selection
162
Name Initial Value
Name
Refer to page 166
Setting Range
0
1
0
2
Parameter
Number
22
75
77
79
160
296
297
Parameter
Number
83 Rated motor voltage
84 Rated motor frequency
90 Motor constant (R1)
96 Auto tuning setting/status
178 to 182 (input terminal function selection)
190, 192, 197 (output terminal function selection)
261 Power failure stop selection
298 Frequency search gain
450 Second applied motor
561 PTC thermistor protection level
Description
Write is enabled only during stop.
Parameter can not be written.
Parameter write is enabled in any operation
mode regardless of operation status.
Name
Stall prevention operation level
Reset selection/disconnected PU detection/
PU stop selection
Parameter write selection
Operation mode selection
Extended function display selection
Password lock level
Password lock/unlock
Name