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6. PROTECTIVE FUNCTIONS
6.5 Check first when you have a trouble
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8
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10
6.5.13 Unable to write parameter setting
6.5.14 Power lamp is not lit
Check
points
Possible cause Countermeasure Refer to
page
Input signal Operation is being performed (signal STF or
STR is ON).
Stop the operation.
When Pr.77 Parameter write selection = "0" (initial value),
write is enabled only during a stop.
168
Parameter
setting
You are attempting to set the parameter in the
External operation mode.
Choose the PU operation mode.
Or, set Pr.77 Parameter write selection = "2" to enable
parameter write regardless of the operation mode.
168, 204
Parameter write is disabled by the Pr.77
Parameter write selection setting.
Check the Pr.77 setting. 168
Operation mode and a writing device do not
correspond.
Check Pr.79, Pr.338, Pr.339, Pr.550 and Pr.551, and select an
operation mode suitable for the purpose.
204, 214
Check
points
Possible cause Countermeasure Refer to
page
Main circuit Wiring or installation is improper. Check for the wiring and the installation.
Power lamp is lit when power is supplied to the control circuit
(R1/L11, S1/L21).
41
Control
circuit
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