Yaskawa AC Drive-P1000 Industrial Fan User Manual
Page 315
The DC bus soft charge relay has reached
90% of 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.
Digital 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
IGBTs have reached 50% of their expected
performance life.
Check the load, carrier frequency, and output frequency.
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
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.
Internal cooling fan has stopped.
• Replace the cooling fan.
Refer to Cooling Fan Replacement: 2A0018 to 2A0081, 4A0007 to 4A0044,
and 5A0006 to 5A0032 on page 349
• After replacing the drive, set parameter o4-03 to 0 to reset the cooling fan operation time.
Airflow around the drive is restricted.
• Provide proper installation space around the drive as indicated in the manual.
Orientation and Spacing on page 48
for details.
• Allow for the proper space and ensure that there is sufficient circulation around the control panel.
• Check for dust or other foreign materials clogging the cooling fan.
• Clear debris caught in the fan that restricts air circulation.
Digital Operator Display
Minor Fault Name
oH2
Drive Overheat Warning
“Drive Overheat Warning” was input to a multi-function input terminal, S1 through S8 (H1-oo= B).
Cause
Possible Solutions
An external device triggered an overheat
warning in the drive.
Search for the device that tripped the overheat warning. Remove the cause of the problem.
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
Motor thermostat wiring is faulty (PTC
input).
Repair the PTC input wiring.
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 C1-04).
• Adjust the preset V/f pattern (E1-04 through E1-10). This involves reducing E1-08 and E1-10.
Note:
Refrain from lowering E1-08 and E1-10 excessively to prevent a reduction in 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.
6.5 Alarm Detection
YASKAWA SIEP YAIP1U 01B AC Drive - P1000 Technical Manual
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6
Troubleshooting