Troubleshooting
6
6.5 Minor Faults/Alarms
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 369
Code Name Causes Possible Solutions
The internal cooling fan or fans have
stopped.
1. Use the procedures in this manual to 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 assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
• Set the stopping method for this fault in L8-03 [Overheat Pre-Alarm Selection].
Code Name Causes Possible Solutions
oH2 External Overheat (H1-
XX=B)
An external device sent an oH2. 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]
that was set to MFDI terminals S1 to S8.
Note:
If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
Code Name Causes Possible Solutions
oH3 Motor Overheat (PTC
Input)
The thermistor wiring that detects motor
temperature is defective.
Correct any wiring errors.
A fault occurred on the machine side.
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 C1-08
[Acceleration/Deceleration Time].
• 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].
For motor 2, adjust E3-04 to E3-10. Decrease
the values set in E1-08 [Mid Point A Voltage]
and E1-10 [Minimum Output Voltage].
Note:
If E1-08 and E1-10 are set too low, the overload
tolerance will decrease at low speeds.
Note:
• The drive detects this error if the motor overheat signal that was entered to an analog input terminals A1, A2, or A3 is more than the
alarm detection level. (If H3-02, H3-10, or H3-06 = E [MFAI Function Select = Motor Temperature (PTC Input)] was set.)
• If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
• If the drive detects this fault, it will operate the motor as specified by the Stopping Method set in L1-03 [Motor Thermistor oH Alarm
Select].
Code Name Causes Possible Solutions
oL3 Overtorque 1 A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the
fault.
The parameters are incorrect for the
load.
Adjust L6-02 [Torque Detection Level 1] and L6-
03 [Torque Detection Time 1] settings.
Note:
• The drive detects this fault if the drive output current is more than the level set in L6-02 for longer than L6-03.
• If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
• Set the conditions that trigger the minor fault using L6-01 [Torque Detection Selection 1].
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