Parameter Write Disable Selection (Pr.77) - Mitsubishi Electric F700 Instruction Manual

3.16.2 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 parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 140.)
Pr. 77 can be always set independently of the operation mode and operation status.
(1) Write parameters only at a stop (setting "0", initial vale)
⋅ Parameters can be written only during a stop in the PU operation mode.
⋅ The parameters marked in the parameter list (page 38)
mode and operation 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
19 Base frequency voltage
23 Stall prevention operation level compensation factor at double speed
48 Second stall prevention operation current
49 Second stall prevention operation frequency
60 Energy saving control selection
66 Stall prevention operation reduction starting frequency
71 Applied motor
79 Operation mode selection
80 Motor capacity (simple magnetic flux vector control)
90 Motor constant (R1)
100 to 109 (Adjustable 5 points V/F parameter)
135 Power-supply switchover sequence output terminal selection
136 MC switchover interlock time
137 Waiting time at a start
138 Commercial power-supply operation switchover selection at an alarm
139 Automatic switchover frequency between inverter and commercial power-supply operation
178 to 196 (I/O terminal function selection)
255 Life alarm status display
256 Inrush current suppression circuit life display
257 Control circuit capacitor life display
258 Main circuit capacitor life display
329 Digital input unit selection (Parameter for the plug-in option FR-A7AX)
343 Communication error count
563 Energization time carrying-over times
564 Operating time carrying-over times
570 Multiple rating setting
♦ Parameters referred to ♦
Pr. 79 Operation mode selection
Initial Value
0
Refer to page 142
Misoperation prevention and parameter
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 operation status.
can always be written, regardless of the operation
Parameter
Number
22 Stall prevention operation level
Reset selection/disconnected PU
75
detection/PU stop selection
77 Parameter write selection
79 Operation mode selection
Name
setting restriction
Description
Name
139
Pr.76
page 116
Pr.78
page 140
3