LED Operator Display
Minor Fault Name
EF1
External fault (input terminal S1)
External fault at multi-function input terminal S1.
EF2
External fault (input terminal S2)
External fault at multi-function input terminal S2.
EF3
External fault (input terminal S3)
External fault at multi-function input terminal S3.
EF4
External fault (input terminal S4)
External fault at multi-function input terminal S4.
EF5
External fault (input terminal S5)
External fault at multi-function input terminal S5.
Cause
Possible Solutions
Minor Fault
Output
(H2-01 = 10)
An external device has tripped an alarm
function.
Remove the cause of the external fault and reset the multi-function input value.
YES
Wiring is incorrect.
• Ensure the signal lines have been connected properly to the terminals assigned for
external fault detection (H1-
= 20 to 2F).
• Reconnect the signal line.
YES
Multi-function contact inputs are set
incorrectly.
• Check if the unused terminals have been set for H1-
= 20 to 2F (External Fault).
• Change the terminal settings.
YES
LED Operator Display
Minor Fault Name
oH
Heatsink Overheat
The temperature exceeded 90-100 °C
Cause
Possible Solutions
Minor Fault
Output
(H2-01 = 10)
Surrounding temperature is too high
• Check the surrounding temperature.
• Improve the air circulation within the enclosure panel.
• Install a fan or air conditioner to cool surrounding area.
• Remove anything near drive that may cause extra heat.
YES
Internal cooling fan has stopped.
• Replace the cooling fan.
Refer to Cooling Fan Replacement on page 145
.
• After replacing the drive, reset the cooling fan maintenance parameter to (o4-03 = “0”).
YES
Airflow around the drive is restricted.
• Provide proper installation space around the drive as indicated in the manual.
Refer
to Correct Installation Orientation on page 27
.
• Allow for the specified space and ensure that there is sufficient circulation around the
control panel.
YES
• Check for dust or foreign materials clogging cooling fan.
• Clear debris caught in the fan that restricts air circulation.
YES
LED Operator Display
Minor Fault Name
oL3
Overtorque 1
Drive output current was greater than L6-02 for longer than the time set in L6-03.
Cause
Possible Solutions
Minor Fault
Output
(H2-01 = 10)
Inappropriate parameter settings.
Check parameters L6-02 and L6-03.
YES
There is a fault on the machine side (e.g.,
the machine is locked up).
• Check the status of the machine.
• Remove the cause of the fault.
YES
LED Operator Display
Minor Fault Name
ov
DC Bus Overvoltage
The DC bus voltage exceeded the trip point.
For 200 V class: approximately 410 V
For 400 V class: approximately 820 V (740 V when E1-01 < 400)
Cause
Possible Solutions
Minor Fault
Output
(H2-01 = 10)
Surge voltage present in the drive input
power.
• Install a DC reactor or an AC reactor.
• Voltage surge can result from a thyristor convertor and a phase advancing capacitor
operating on the same drive input power system.
YES
• The motor is short-circuited.
• Ground current has over-charged the
main circuit capacitors via the drive
input power.
• Check the motor power cable, relay terminals and motor terminal box for short circuits.
• Correct grounding shorts and turn the power back on.
YES
Noise interference causes the drive to
operate incorrectly.
• Review possible solutions for handling noise interference.
• Review section on handling noise interference and check control circuit lines, main
circuit lines and ground wiring.
• If the magnetic contactor is identified as a source of noise, install a surge protector to
the MC coil.
YES
Set number of fault restarts (L5-01) to a value other than 0.
YES
LED Operator Display
Minor Fault Name
PASS
MEMOBUS/Modbus Communication Test Mode Complete
6.5 Alarm Detection
130
SIEP C710606 33A OYMC AC Drive – J1000 User Manual
