A special-purpose motor is being used, or
the drive is attempting to run a motor
greater than the maximum allowable
capacity.
• Check the motor capacity.
• Use a motor appropriate for the drive. Ensure the motor is within the allowable capacity
range.
YES
LED Operator Display Minor Fault Name
LT-1
Cooling Fan Maintenance Time
The cooling fan has reached its expected maintenance period and may need to be replaced.
Note: An alarm output (H2-oo = 10) will only be triggered if H2-oo = 2F.
Cause Possible Solutions
Minor Fault
Output
(H2-oo =
10)
The cooling fan has reached 90% of its
expected performance life.
Replace the cooling fan and reset the Maintenance Monitor by setting o4-03 to 0. –
LED Operator Display Minor Fault Name
LT-2
Capacitor Maintenance Time
The main circuit and control circuit capacitors are nearing the end of their expected performance life.
Note: An alarm output (H2-oo = 10) will only be triggered if H2-oo = 2F.
Cause Possible Solutions
Minor Fault
Output
(H2-oo =
10)
The main circuit and control circuit
capacitors have 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.
–
LED 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-oo = 10) will only be triggered if H2-oo = 2F.
Cause Possible Solutions
Minor Fault
Output
(H2-oo =
10)
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.
–
LED Operator Display Minor Fault Name
LT-4
IGBT Maintenance Time (50%)
IGBTs have reached 50% of their expected performance life.
Note: An alarm output (H2-oo = 10) will only be triggered if H2-oo = 2F.
Cause Possible Solutions
Minor Fault
Output
(H2-oo =
10)
IGBTs have reached 50% of their expected
performance life.
Check the load, carrier frequency, and output frequency. –
LED Operator Display Minor Fault Name
oH
Heatsink Overheat
The temperature exceeded the value set to L8-02.
Cause Possible Solutions
Minor Fault
Output
(H2-oo =
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 297.
• 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 38.
• 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
6.5 Alarm Detection
270
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
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