Yaskawa iQpump1000 AC Drive Quick Start - Manual (Page 251)

HOA Keypad Display Fault Name
oH
Heatsink Overheat
The heatsink temperature exceeded the overheat pre-alarm level set to L8-02.
Cause Possible Solution
Surrounding temperature is too high
• Check the temperature surrounding the drive. Verify temperature is within drive specifications.
• Improve the air circulation within the enclosure panel.
• Install a fan or air conditioner to cool the surrounding area.
• Remove anything near the drive that might be producing excessive heat.
Load is too heavy
• Measure the output current.
• Decrease the load.
• Lower the carrier frequency (C6-02).
Internal cooling fan is stopped
• Replace the cooling fan. .
• After replacing the cooling fan, set parameter o4-03 to 0 to reset the cooling fan maintenance.
HOA Keypad Display Fault Name
oH1
Overheat 1 (Heatsink Overheat)
The heatsink temperature exceeded the drive overheat level.
Cause Possible Solution
Surrounding temperature is too high
• Check the temperature surrounding the drive.
• Improve the air circulation within the enclosure panel.
• Install a fan or air conditioner to cool the surrounding area.
• Remove anything near the drive that might be producing excessive heat.
Load is too heavy
• Measure the output current.
• Lower the carrier frequency (C6-02).
• Reduce the load.
HOA Keypad Display Fault Name
oH4
Motor Overheat Fault (PTC Input)
• The motor overheat signal to analog input terminal A1, A2, or A3 exceeded the fault detection level.
• Detection requires setting multi-function analog inputs H3-02, H3-10, or H3-06 to E.
Cause Possible Solution
Motor has overheated
• Check the size of the load, the accel/decel times, and the cycle times.
• Decrease the load.
• Increase the acceleration and deceleration times (C1-01 through C1-04).
• Adjust the preset V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10.
• Do not set E1-08 and E1-10 too low. This reduces load tolerance at low speeds.
• Check the motor rated current.
• Enter the motor rated current to parameter E2-01 as indicated on the motor nameplate.
• Ensure the motor cooling system is operating normally.
• Repair or replace the motor cooling system.
HOA Keypad Display Fault Name
oH5
<1>
Motor Overheat (NTC Input)
The motor temperature exceeded the level set to L1-16 (or L1-18 for motor 2)
Cause Possible Solution
Motor has overheated
• Reduce the load.
• Check the ambient temperature.
<1> Detected in models 4A0930 and 4A1200.
HOA Keypad Display Fault Name
oL1
Motor Overload
The electronic motor overload protection tripped
Cause Possible Solution
Load is too heavy Reduce the load.
5.2 Fault Detection
YASKAWA TOEP YAIP1W 01B YASKAWA AC Drive - iQpump1000 Quick Start Guide 251
5
Troubleshooting