7-6
Fault
display
Probable cause and remedyFault name and
meaning
f04 Initial memory fault
(F04)
An error in the built-in
EEPROM of the Inverter
has been detected.
•The internal circuitry of the Inverter has a fault.
→ Initialize the Inverter with n01 set to 8 or 9 and
turn the Inverter off and on.
→ Replace the Inverter if the same fault occurs
again.
f05 Analog-to-digital
converter fault (F05)
An analog-to-digital
converter fault has been
detected.
•The internal circuitry of the Inverter has a fault.
→ Turn the Inverter off and on.
→ Replace the Inverter if the same fault occurs
again.
f07 Digital Operator fault
(F07)
An error in the built-in
control circuit of the
Digital Operator has
been detected.
•The internal circuitry of the Digital Operator has a
fault.
→ Turn the Digital Operator off and on.
→ Replace the Digital Operator if the same fault
occurs again.
Emergency stop (STP)
An emergency stop
alarm is input to a
multi-function input. (A
multi-function input 1, 2,
3, or 4 set to 19 or 21
has operated.)
•An emergency stop alarm is input to a multi-func-
tion input.
→ Remove the cause of the fault.
•The sequence is incorrect.
→ Check and change the external fault input
sequence including the input timing and NO or
NC contact.
OFF Power supply error
•Insufficient power sup-
ply voltage
•Control power supply
fault
•Hardware fault
•No power supply is provided.
→ Check and correct the power supply wire and
voltage.
•Terminal screws are loosened.
→ Check and tighten the terminal screws.
•The Inverter is damaged.
→ Replace the Inverter.
Maintenance Operations Chapter
7
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