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Parameter Write Disable Selection (pr. 77) - Mitsubishi Electric FR-D720-008 Instruction Manual

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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
Name
Number
77
Parameter write selection
The above parameter can be set when Pr. 160 Extended function display selection = "0". (Refer to page 160)
Pr. 77 can be always set independently of 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 54) 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 prameters 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
83
Rated motor voltage
84
Rated motor frequency
90
Motor constant (R1)
Parameters referred to
Pr. 79 Operation mode selection
Misoperation prevention and parameter setting restriction
Initial Value
0
Name
Refer to page 163
Setting Range
0
Write is enabled only during stop.
1
Parameter can not be written.
Parameter write is enabled in any operation
2
mode regardless of operation status.
Parameter
Number
22
Stall prevention operation level
Reset selection/disconnected PU detection/
75
PU stop selection
77
Parameter write selection
79
Operation mode selection
160
Extended function display selection
296
Password lock level
297
Password lock/unlock
Parameter
Number
96
Auto tuning setting/status
178 to 182
(input terminal function selection)
190, 192
(output terminal function selection)
255
Life alarm status display
256
Inrush current limit circuit life display
257
Control circuit capacitor life display
258
Main circuit capacitor life display
261
Power failure stop selection
298
Frequency search gain
343
Communication error count
450
Second applied motor
561
PTC thermistor protection level
563
Energization time carrying-over times
564
Operating time carrying-over times
Description
Name
Name
159
4

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Fr-d740-012Fr-d710w-008Fr-d720s-008

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