Mitsubishi Electric 800 Series Instruction Manual page 594

6.5.13 Unable to write parameter setting
Check Possible cause
points
Input signal Operation is being performed (signal STF or
STR is ON).
Parameter You are attempting to set the parameter in the
setting External operation mode.
Parameter write is disabled by the Pr.77
Parameter write selection setting.
Operation mode and a writing device do not
correspond.
6.5.14 Power lamp is not lit
Check Possible cause
points
Main circuit Wiring or installation is improper.
Control
circuit
Countermeasure
Stop the operation.
When Pr.77 Parameter write selection = "0" (initial value),
write is enabled only during a stop.
Choose the PU operation mode.
Or, set Pr.77 Parameter write selection = "2" to enable
parameter write regardless of the operation mode.
Check the Pr.77 setting.
Check Pr.79, Pr.338, Pr.339, Pr.550 and Pr.551, and select an
operation mode suitable for the purpose.
Countermeasure
Check for the wiring and the installation.
Power lamp is lit when power is supplied to the control circuit
(R1/L11, S1/L21).
Refer to
168
168,
168
204,
Refer to
41
6. PROTECTIVE FUNCTIONS
6.5 Check first when you have a trouble
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