6.5 Alarm Detection
370 YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
Digital Operator Display Minor Fault Name
LT-3
Soft Charge Bypass Relay Maintenance Time
The DC bus soft charge relay is nearing the end of its expected performance life.
Note: An alarm output (H2- = 10) will only be triggered if H2- = 2F.
Cause Possible Solutions
Minor Fault
(H2-01 = 2F)
The DC bus soft charge relay has reached 90% of
their expected performance life.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
YES
Digital Operator Display Minor Fault Name
oH
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
determined by drive capacity (o2-04).
Cause Possible Solutions
Minor Fault
(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 Component Names on page 399.
• After replacing the drive, reset the cooling fan maintenance parameter to (o4-03 = “0”).
Airflow around the drive is restricted.
• Provide proper installation space around the drive as indicated in the manual. Refer to Installation Orientation
and Spacing on page 51.
• 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.
Digital Operator Display Minor Fault Name
oH2
Heatsink Overheat Warning
“Heatsink Overheat Warning” was input to a multi-function input terminal, S1 through S8 (H1-= B)
Cause Possible Solutions
Minor Fault
(H2-01 = 10)
An external device triggered an overheat warning in
the drive.
• Search for the device that tripped the overheat warning.
• Solving the problem will clear the warning.
YES
Digital Operator Display Minor Fault Name
oH3
Motor Overheat
The motor overheat signal entered to a multi-function analog input terminal exceeded the alarm level (H3-02, H3-06 or H3-10 = E).
Cause Possible Solutions
Minor Fault
(H2-01 = 10)
Motor thermostat wiring is fault (PTC input). Repair the PTC input wiring.
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.
Motor has overheated.
• Check the load size, accel/decel times, and cycle times.
• Decrease the load.
• Increase accel and decel times (C1-01 to C1-08).
• Adjust the preset V/f pattern (E1-04 through E1-10). This will mainly involve reducing E1-08 and E1-10.
Note: Do not lower E1-08 and E1-10 excessively, because this reduces load tolerance at low speeds.
• Check the motor-rated current.
• Enter motor-rated current on motor nameplate (E2-01).
• Ensure the motor cooling system is operating normally.
• Repair or replace the motor cooling system.
Digital Operator Display Minor Fault Name
oL3
Overtorque 1
Drive output current (or torque in OLV, CLV, AOLV/PM, CLV/PM) was greater than L6-02 for longer than the time set in L6-03.
Cause Possible Solutions
Minor Fault
(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.
Digital Operator Display Minor Fault Name
oL4
Overtorque 2
Drive output current (or torque in OLV, CLV, AOLV/PM, CLV/PM) was greater than L6-05 for longer than the time set in L6-06.
Cause Possible Solutions
Minor Fault
(H2-01 = 10)
Parameter settings are not appropriate. Check parameters L6-05 and L6-06.
YES
There is a fault on the machine side (e.g., the
machine is locked up).
• Check the status of the machine being used.
• Remove the cause of the fault.
Digital Operator Display Minor Fault Name
oL5
Mechanical Weakening Detection 1
Overtorque occurred, matching the conditions specified in L6-08.
Cause Possible Solutions
Minor Fault
(H2-01 = 10)
Overtorque occurred, triggering the mechanical
weakening level set to L6-08.
Check for the cause of mechanical weakening. YES
SIEP_C710636_02B_1_0.book 370 ページ ２０１５年１１月２５日 水曜日 午後４時５６分
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