6.4 Alarm Detection
302 YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
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. Refer to Cooling Fan Component Names on page 326.
• After replacing the drive, reset the cooling fan maintenance parameter to (o4-03 = “0”).
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 43.
• Allow for the specified space and ensure that there is sufficient circulation around the control panel.
• Check for dust or foreign materials clogging cooling fan.
• Clear debris caught in the fan that restricts air circulation.
Digital Operator Display Minor Fault Name
oH3
Motor Overheat Alarm (PTC thermistor input)
• The motor overheat signal to analog input terminal A1 or A2 exceeded the alarm detection level.
• Detection requires multi-function analog input H3-02 or H3-10 be set to “E”.
Cause Possible Solutions
Motor thermostat wiring is fault (PTC thermistor
input).
Repair the PTC thermistor 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 size of the load, the accel/decel times, and the cycle times.
• Decrease the load.
• Increase the acceleration and deceleration times (C1-01 through C1-08).
• Adjust the preset V/f pattern (E1-04 through E1-10). This will mainly involve reducing E1-08 and E1-10.
• Be careful not to lower E1-08 and E1-10 too much, as this reduces load tolerance at low speeds.
• Check the motor rated current.
• Enter the motor rated current as indicated on the motor nameplate (E2-01).
• Ensure the motor cooling system is operating normally.
• Repair or replace the motor cooling system.
Digital Operator Display Minor Fault Name
oL3
Overtorque Detection 1
Drive output current (or torque in OLV, CLV, CLV/PM) was greater than L6-02 for longer than the time set in L6-03.
Cause Possible Solutions
Inappropriate parameter settings. Check parameters L6-02 and L6-03.
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.
Digital Operator Display Minor Fault Name
oL4
Overtorque Detection 2
Drive output current (or torque in OLV, CLV, CLV/PM) was greater than L6-05 for longer than the time set in L6-06.
Cause Possible Solutions
Parameter settings are not appropriate. Check parameters L6-05 and L6-06.
There is a fault on the machine side (e.g., the
machine is locked up).
• Check the status of the machine being used.
• Remove the cause of the fault.
Digital Operator Display Minor Fault Name
oS
Overspeed (for Control Mode with Encoder)
The motor speed feedback exceeded the F1-08 setting.
Cause Possible Solutions
Inappropriate parameter settings. Check the setting for the overspeed detection level and the overspeed detection time (F1-08 and F1-09).
SIEP_C710616_38F_5_0.book 302 ページ ２０１５年１１月９日 月曜日 午後３時３６分
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