Parameter Write Inhibit Selection (Pr. 77); Reverse Rotation Prevention Selection (Pr. 78) - Mitsubishi FR-E500 Series Instruction Manual

4.2.24 Parameter write inhibit 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 incorrect operation.
Parameter Factory
Number Setting
77
<Setting>
Pr. 77
Setting
Parameter values may only be written while the inverter is
0
at a stop in the PU or DeviceNet operation mode. (Note 1)
2 Write enabled even while the inverter is running.
Note: 1. The parameters half-tone screened in the parameter list can be set at any
time.
2. If Pr. 77 = 2, the values of Pr. 23, Pr. 66, Pr. 71, Pr. 79, Pr. 80, Pr. 83, Pr. 84,
Pr. 96, Pr. 180 to Pr.183 and Pr. 190 to Pr. 192 cannot be written during
operation. Stop operation when changing their parameter settings.
3. When the parameter unit (FR-PU04) is used, setting "1" in Pr. 77 can inhibit
parameter write. At this time, values may be written to Pr. 75, Pr. 77 and
Pr. 79.
Parameter clear and parameter all clear are also be inhibited.

" Reverse rotation prevention selection (Pr. 78)

4.2.25 Reverse rotation prevention selection (Pr. 78)
Pr. 78 "reverse rotation prevention
selection"
This function can prevent any reverse rotation fault resulting from the incorrect input of
the start signal.
! Used for a machine which runs only in one direction, e.g. fan, pump.
(The setting of this function is valid for the PU and DeviceNet operations.)
Parameter Factory
Number Setting
78
<Setting>
Pr. 78 Setting
Both forward and reverse
0
rotations allowed
1 Reverse rotation disallowed
2 Forward rotation disallowed
Setting Range
0 0, 2
Function
Setting
Range
0 0, 1, 2
Function
90
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PARAMETERS
Related parameters
Pr. 79 "operation mode selection"
Related parameters
Pr. 79 "operation mode selection"
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