YASKAWA iQpump1000 User Manual page 279

HOA Keypad Display
No message was received from the master
within the time set in P9-28.
HOA Keypad Display
NMS
Cause
When the feedback deviates from the
setpoint at a level greater than P1-15, for a
time set in P1-16. This is effective only
when P1-17 is set to 1 (alarm).
HOA Keypad Display
oH
Cause
Surrounding temperature is too high
Internal cooling fan has stopped.
Airflow around the drive is restricted.
HOA Keypad Display
oH2
Cause
An external device triggered an overheat
warning in the drive.
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.
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
• Increase the P9-26 setting to account for network latency.
• Verify that there is a drive on the network with parameter P1-01 set to 3 and P9-27 to 0.
• Check network connections and verify H5-01 and P9-25 settings for all drives on the network.
Not Maintaining Setpoint
The setpoint cannot be maintained and P1-17 is set to 1.
• Check for a blocked impeller, over cycling, or broken pipe.
• Set the Not Maintaining Setpoint alarm characteristics in P1-16 and P1-17.
• Drive response to this condition is controlled by P1-17, Not Maintaining Setpoint Selection.
Heatsink Overheat
The temperature of the heatsink exceeded the overheat pre-alarm level set to L8-02.
• 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.
• Replace the cooling fan.
• After replacing the drive, set parameter o4-03 to 0 to reset the cooling fan operation time.
• Provide proper installation space around the drive as indicated in the manual.
Orientation and Spacing on page 36
• 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.
Drive Overheat Warning
"Drive Overheat Warning" was input to a multi-function input terminal, S1 through S8 (H1-oo= B).
Search for the device that tripped the overheat warning. Remove the cause of the problem.
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).
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 C1-04).
• 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.
Minor Fault Name
Minor Fault Name
Possible Solution
Minor Fault Name
Possible Solution
for details.
Minor Fault Name
Possible Solution
Minor Fault Name
Possible Solutions
5.3 Alarm Detection
Refer to Installation
279
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