YASKAWA L1000A Technical Manual page 272

6.4 Alarm Detection
Digital Operator Display
Cause
Surrounding temperature is too high
Internal cooling fan has stopped.
Airflow around the drive is restricted.
Digital Operator Display
Cause
Inappropriate parameter settings.
There is a fault on the machine side (e.g., the
machine is locked up).
Digital Operator Display
Cause
Parameter settings are not appropriate.
There is a fault on the machine side (e.g., the
machine is locked up).
Digital Operator Display
Cause
Inappropriate parameter settings.
Digital Operator Display
Cause
Surge voltage present in the drive input power.
The motor is short-circuited.
Ground current has over-charged the main circuit
capacitors via the drive input power.
Noise interference causes the drive to operate
incorrectly.
Encoder cable is disconnected.
Encoder cable wiring is wrong.
Noise interference along encoder wiring.
Digital Operator Display
Cause
MEMOBUS/Modbus test has finished normally.
Digital Operator Display
Cause
Encoder cable is disconnected.
Encoder cable wiring is wrong.
Encoder does not have enough power.
Motor brake is not released.
272
Heatsink Overheat
The temperature of the heatsink exceeded the overheat pre-alarm level set to L8-02 (90-100 °C). Default value for L8-02 is
oH
determined by drive capacity (o2-04).
• 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.
• Replace the cooling fan.
• After replacing the drive, reset the cooling fan maintenance parameter to (o4-03 = "0").
• Provide proper installation space around the drive as indicated in the manual.
page 39.
• Allow for the specified space and ensure that there is sufficient circulation around the control panel.
• Check for dust or foreign materials clogging cooling fan.
• Clear debris caught in the fan that restricts air circulation.
Overtorque Detection 1
oL3
Drive output current (or torque in OLV, CLV, CLV/PM) was greater than L6-02 for longer than the time set in L6-03.
Check parameters L6-02 and L6-03.
• Check the status of the machine.
• Remove the cause of the fault.
Overtorque Detection 2
oL4
Drive output current (or torque in OLV, CLV, CLV/PM) was greater than L6-05 for longer than the time set in L6-06.
Check parameters L6-05 and L6-06.
• Check the status of the machine being used.
• Remove the cause of the fault.
Overspeed (for Control Mode with Encoder)
oS
The motor speed feedback exceeded the F1-08 setting.
Check the setting for the overspeed detection level and the overspeed detection time (F1-08 and F1-09).
DC Bus Overvoltage
The DC bus voltage exceeded the trip point.
ov
For 200 V class: approximately 410 V
For 400 V class: approximately 820 V
• Install a DC link choke 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.
• Check the motor power cable, relay terminals and motor terminal box for short circuits.
• Correct grounding shorts and turn the power back on.
• 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.
Set number of fault reset (L5-01) to a value other than 0.
Reconnect the cable.
Correct the wiring.
Separate encoder wiring from the source of the noise (often output wiring from the drive).
PASS MEMOBUS/Modbus Comm. Test Mode Complete
This verifies that the test was successful.
Encoder Disconnected (for Control Mode with Encoder)
PGo
Detected when no encoder signal is received for a time longer than setting in F1-14.
Reconnect the cable.
Correct the wiring.
Make sure the correct power supply is properly connected to the encoder.
Ensure the brake releases properly
Minor Fault Name
Possible Solutions
Refer to Cooling Fan Component Names on page
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
YASKAWA ELECTRIC SIEP C710616 38A YASKAWA AC Drive L1000A Technical Manual
294.
Refer to Installation Orientation and Spacing on