YASKAWA Z1000 User Manual page 208

5.4 Fault Detection
Digital Operator Display
Cause
Surrounding temperature is too high
Load is too heavy
Internal cooling fan is stopped
Digital Operator Display
Cause
Surrounding temperature is too high
Load is too heavy
HOA Keypad Display
oH3
Cause
Motor thermostat wiring is faulty (PTC input).
There is a fault on the machine side (e.g., the
machine is locked up)
Motor has overheated
208
Heatsink Overheat
oH
The heatsink temperature exceeded the overheat pre-alarm level set to L8-02. The default value for L8-02
is determined by drive model selection (o2-04).
• 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.
• Measure the output current.
• Decrease the load.
• Lower the carrier frequency selection (C6-02).
• Replace the cooling fan.
• After replacing the cooling fan, set parameter o4-03 to 0 to reset the cooling fan maintenance.
Overheat 1 (Heatsink Overheat)
oH1
The heatsink temperature exceeded the drive overheat level. Overheat level is determined by drive
capacity (o2-04).
• 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.
• Measure the output current.
• Lower the carrier frequency selection (C6-02).
• Reduce the load.
Motor Overheat
The motor overheat signal entered to a multi-function analog input terminal exceeded the alarm level
(H3-02 or H3-10 = E).
Repair the PTC input wiring.
• Check the status of the machine.
• Remove the cause of the fault.
• Check the load size, accel/decel times, and cycle times.
• Decrease the load.
• Increase accel and decel times (C1-01 to C1-08).
• Adjust the preset V/f pattern (E1-04 through E1-10). This involves reducing E1-08 and E1-10.
Note:
• 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.
Fault Name
Possible Solution
Fault Name
Possible Solution
Minor Fault Name
Possible Solutions
Refrain from lowering E1-08 and E1-10 excessively to prevent a reduction in load
tolerance at low speeds.
YASKAWA TOEP YAIZ1U 03B YASKAWA AC Drive – Z1000 User Manual