Parameter Write Disable Selection (Pr. 77) - Mitsubishi Electric 700 Series Instruction Manual

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Misoperation prevention and parameter setting restriction

5.17.2 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
Parameter write selection
77
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 167)
Pr. 77 can be set anytime regardless of the operation mode or the operation status. However, it cannot be changed through FL remote
communication.
(1)
Write parameters only during stop (setting "0" initial value)
Parameters can be written only during a stop.
The shaded parameters in the parameter list (page 78) can always be written regardless of the operation mode and
operating status. However, Pr. 72 PWM frequency selection, Pr. 240 Soft-PWM operation selection, and Pr. 275 Stop-on contact
excitation current low-speed multiplying factor can be written when the inverter is running in the PU operation mode, but
cannot be written in the Network 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 if Pr. 77 =
"1". (Note that the Pr.77 setting cannot be changed through
FL remote communication.)
(3)
Write parameters during operation (setting "2")
Parameters can always be written.
The following prameters cannot be written when the inverter is running 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
61
Reference current
Stall prevention operation reduction starting
66
frequency
71
Applied motor
80
Motor capacity
81
Number of motor poles
82
Motor excitation current
166
Name
Initial Value
Name
Setting Range
0
1
0
2
Parameter
Number
22
75
77
160
296
297
Parameter
Number
83
Rated motor voltage
84
Rated motor frequency
90 to 94
(Motor constants)
96
Auto tuning setting/status
277
Stall prevention operation current switchover
292
Automatic acceleration/deceleration
293
Acceleration/deceleration separate selection
298
Frequency search gain
450
Second applied motor
800
Control method selection
859
Torque current
Description
Write is enabled only during a 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/PU stop selection
Parameter write selection
User group read selection
Password lock level
Password lock/unlock
Name

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