Parameter Write Selection (Pr. 77) - Mitsubishi Electric FR-F740 EC Instruction Manual

Misoperation prevention and parameter setting restriction
6.16.2

Parameter write 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.
Pr.
Name
No.
77
Parameter write selection
The above parameter can be set when Pr. 160 = 0.
Pr. 77 can be always set independent of the operation mode and operation status.
Write parameters only at a stop (Pr. 77 = 0)
Parameters can be written only during a stop in the PU operation mode.
The half-tone screened parameters in the parameter list (Tab. 6-1) can always be written, re-
gardless of the operation mode and operation status. However, Pr. 72 "PWM frequency selec-
tion" and Pr. 240 "Soft-PWM operation selection" can be written during operation in the PU op-
eration mode, but cannot be written in external operation mode.
Disable parameter write (Pr. 77 = 1)
Parameter write is not enabled. (Reading is enabled.)
Parameter clear and all parameter clear cannot be performed, either.
The parameters given below can be written if Pr. 77 = 1.
Parameter
Tab. 6-39:
6 - 218
Initial Setting
Description
Value Range
0 Write is enabled only during a stop.
1 Parameter write is not enabled.
0
Parameter write is enabled in any opera-
2
tion mode regardless of operation status.
Name
22 Stall prevention operation level
75 Reset selection/disconnected PU detection/PU stop selection
77 Parameter write selection
79 Operation mode selection
160 User group read selection
296 Password lock level
297 Password lock/unlock
997 Fault initiation
Parameters that can be written even if Pr. 77 = 1
Parameter
Refer to
Parameters referred to
Section
79 Operation mode 6.17.1
selection