Parameter Write Disable Selection (Pr. 77) - Mitsubishi Electric FR-A500 Instruction Manual

4.2.34 Parameter write disable selection (Pr. 77)

Pr. 77 "parameter write disable selection"
You can select between write-enable and disable for parameters. This function is used to prevent parameter
values from being rewritten by accident.
Parameter Factory
Number Setting
77 0
<Setting>
Pr. 77 Setting
Write enabled during a stop only.
0
Parameter values may only be written during a stop in the PU operation mode. (Note 1)
Write disabled.
1
Values of Pr. 22, Pr. 75, Pr. 77 and Pr. 79 "operation mode selection" can be written.
2 Write enabled even during operation.
Note: 1. The shaded parameters in the parameter list can be set at any time. (Refer to page 62.)
(Pr. 72 and Pr. 240 values cannot be set during external operation.)
2. If Pr. 77 = "2", the values of the following parameters cannot be written during operation. Stop
operation when changing their parameter settings.
Parameter
Number
Stall prevention operation level compensation
23
factor at double speed
48 Second stall prevention operation current
49 Second stall prevention operation frequency
60 Intelligent mode 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
83 Rated motor voltage
84 Rated motor frequency
95 Advanced mode selection
96 Auto tuning setting/status
100 V/F1 (first frequency)
101 V/F1 (first frequency voltage)
102 V/F2 (second frequency)
103 V/F2 (second frequency voltage)
104 V/F3 (third frequency)
105 V/F3 (third frequency voltage)
106 V/F4 (fourth frequency)
107 V/F4 (fourth frequency voltage)
3. By setting "1" in Pr. 77, the following clear operations can be inhibited:
•Parameter clear
•All clear
•User clear
Setting Range
0, 1, 2
Function
Name
109
Related parameters
Pr. 79 "operation mode selection"
Parameter
Number
108 V/F5 (fifth frequency)
109 V/F5 (fifth frequency voltage)
Commercial power supply-inverter switchover
135
sequence output terminal selection
136 MC switchover interlock time
137 Start waiting time
Commercial power supply-inverter switchover
138
selection at alarm occurrenc
Automatic inverter-commercial power supply
139
switchover frequency
180 RL terminal function selection
181 RM terminal function selection
182 RH terminal function selection
183 RT terminal function selection
184 AU terminal function selection
185 JOG terminal function selection
186 CS terminal function selection
190 RUN terminal function selection
191 SU terminal function selection
192 IPF terminal function selection
193 OL terminal function selection
194 FU terminal function selection
195 A, B, C terminal function selection
PARAMETERS
Name
4