Yaskawa AC Drive Z1000 Bypass Technical Manual User Manual
Page 243
HOA Keypad 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.
• 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 41
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.
HOA Keypad Display
Minor Fault Name
oH2
Drive Overheat Warning
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.
HOA Keypad 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 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 and C1-02).
• Adjust the preset V/f pattern. Set E1-03 to 6.
• 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.
HOA Keypad Display
Minor Fault Name
oL3
Overtorque 1
Drive output current was greater than L6-02 for longer than the time set to L6-03.
Cause
Possible Solutions
Inappropriate parameter settings
Check parameters L6-02 and L6-03.
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.
HOA Keypad Display
Minor Fault Name
ov
DC Bus Overvoltage
The DC bus voltage exceeded the trip point.
• For 208 V: approximately 410 V
• For 480 V: approximately 820 V
Cause
Possible Solutions
Surge voltage present in the drive input power
• Install an AC reactor.
• Voltage surge can result from a thyristor convertor and a phase advancing capacitor operating on
the same drive input power system.
6.5 Alarm Detection
YASKAWA ELECTRIC SIEP YAIZ1B 01D YASKAWA AC Drive – Z1000 Bypass Technical Manual
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Diagnostics & Troubleshooting