Parameter Write Disable Selection (Pr. 77) - Mitsubishi Electric FR-E720-0.1 K Instruction Manual

Misoperation prevention and parameter setting restriction

4.18.2 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 parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 183)
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 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 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 if Pr. 77 = "2". Stop the inverter when changing their
parameter settings.
Parameter
Number
19 Base frequency voltage
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
79 Operation mode selection
80 Motor capacity
81 Number of motor poles
82 Motor excitation current
83 Rated motor voltage
84 Rated motor frequency
90 to 94 (Motor constants)
96 Auto tuning setting/status
178 to 184 (input terminal function selection)
190 to 192 (output terminal function selection)
Parameters referred to
Pr. 79 Operation mode selection
182
Name Initial Value
Name
Refer to page 186
Setting Range
0
1
0
2
Parameter
Number
22
75
77
79
160
Parameter
Number
255 Life alarm status display
256 Inrush current limit circuit life display
257 Control circuit capacitor life display
258 Main circuit capacitor life display
277 Stall prevention operation current switchover
292 Automatic acceleration/deceleration
293 Acceleration/deceleration separate selection
298 Frequency search gain
Digital input unit selection
329
(Parameter for the plug-in option FR-A7AX E kit)
343 Communication error count
450 Second applied motor
Frequency command sign selection (CC-Link)
541
(Parameter for the plug-in option FR-A7NC E kit)
563 Energization time carrying-over times
564 Operating time carrying-over times
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/disconnected PU detection/
PU stop selection
Parameter write selection
Operation mode selection
User group read selection
Name