YASKAWA Z1000U Technical Manual page 226

6.5 Alarm Detection
HOA Keypad Display
LT-1
Cause
The cooling fan has reached 90% of its expected
performance life
HOA Keypad Display
LT-2
Cause
The main circuit and control circuit capacitors have
reached 90% of their expected performance lives
HOA Keypad Display
LT-3
Cause
The DC bus soft charge relay has reached 90% of
expected performance life
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).
226
Cooling Fan Maintenance Time
The cooling fan has reached its expected maintenance period and may need to be replaced.
Note: An alarm output (H2-oo = 10) will only be triggered if both (H2-oo = 2F
and H2-oo = 10) are set.
Replace the cooling fan and set o4-03 to 0 to reset the Maintenance Monitor.
Capacitor Maintenance Time
The main circuit and control circuit capacitors are nearing the end of their expected performance life.
Note: An alarm output (H2-oo = 10) will only be triggered if H2-oo = 2F.
Replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
Soft Charge Bypass Relay Maintenance Time
The DC bus soft charge relay is nearing the end of its expected performance life.
Note: An alarm output (H2-oo = 10) will only be triggered if H2-oo = 2F.
Replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
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).
• 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 39
• 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 or H3-10 = E).
Repair the PTC input wiring.
YASKAWA SIEP YAIZ1D 01C Z1000U HVAC MATRIX Drive Bypass Technical Manual
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
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for details.
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Refer to Installation