Troubleshooting
6
6.6 Minor Faults/Alarms
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference 505
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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