Yaskawa Z1000 AC Drive HVAC - Manual (Page 215)

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.
• 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. Refer to Installation
Orientation and Spacing on page 38 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 S7 (H1-= 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.
Digital Operator 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
5.5 Alarm Detection
YASKAWA ELECTRIC TOEP YAIZ1U 03A YASKAWA AC Drive – Z1000 User Manual 215
5
Troubleshooting