Troubleshooting
5
5.6 Minor Faults/Alarms
YASKAWA TOEPYAIH6B01A HV600 AC Drive Narrow Bypass Installation & Startup 139
Code Name Causes Possible Solutions
OD Output Disconnect
The output circuit between the drive and the motor is
open, and the drive output current is less than 5% of
E2-01 [Motor Rated Current (FLA)].
• Close the disconnected output circuit between the drive and the
motor.
• If you do not use a motor disconnect, set Y4-42 = 0 [Disabled].
Note:
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
• If the drive detects this error, it will respond as specified by the setting of Y4-42 [Output Disconnect Detection Sel].
Code Name Causes Possible Solutions
oH Heatsink Overheat
The ambient temperature is high and the heatsink
temperature is more than the L8-02 [Overheat Alarm
Level].
• Measure the ambient temperature.
• Increase the airflow around the drive.
• Install a cooling device (cooling fan or air conditioner) to
decrease the ambient temperature.
• Remove objects near the drive that are producing too much heat.
There is not sufficient airflow around the drive. • Give the drive the correct installation space as shown in the
manual.
• Make sure that there is sufficient circulation around the control
panel.
• Examine the drive for dust or other unwanted materials that
could clog the cooling fan.
• Remove unwanted materials that prevent air circulation.
The internal cooling fan or fans stopped. 1. Replace the cooling fan.
2. Set o4-03 = 0 [Fan Operation Time Setting = 0 h] to reset the
cooling fan operation time.
Note:
• The drive detects this error if the heatsink temperature of the drive is more than L8-02.
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
• Use L8-03 [Overheat Pre-Alarm Selection] to the stopping method for this fault.
Code Name Causes Possible Solutions
oH2 External Overheat (H1-XX=B)
An external device sent an oH2 alarm. 1. Find the external device that output the overheat alarm.
2. Remove the cause of the problem.
3. Clear the Overheat Alarm (oH2) [H1-xx = B] in MFDI
terminals S1 to S7.
Note:
If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
Code Name Causes Possible Solutions
oH3 Motor Overheat (PTC Input)
The thermistor wiring that detects motor temperature
is defective.
Correct wiring errors.
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the fault
The motor has overheated. • Check the load level, acceleration/deceleration time, and motor
start/stop frequency (cycle time).
• Decrease the load.
• Increase the values set in C1-01 to C1-04 [Acceleration/
Deceleration Times].
• Set E2-01 [Motor Rated Current (FLA)] correctly to the value
specified by the motor nameplate.
• Make sure that the motor cooling system is operating correctly,
and repair or replace it if it is damaged.
• Adjust E1-04 to E1-10 [V/f Pattern Parameters]. Decrease the
values set in E1-08 [Mid Point A Voltage] and E1-10 [Minimum
Output Voltage].
Note:
If the values set in E1-08 and E1-10 are too low, the overload
tolerance will decrease at low speeds.
Note:
• When H3-02 or H3-10 = E [MFAI Function Selection = Motor Temperature (PTC Input)], the drive detects this fault if the motor overheat signal entered to analog input terminals
A1 and A2 is more than the alarm detection level.
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
• If the drive detects this error, it will operate the motor as specified by the stopping method set in L1-03 [Motor Thermistor oH Alarm Select].
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