YASKAWA CR700

Troubleshooting
6
6.5 Minor Faults/Alarms
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 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 [CoolingFan OperationTime 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 H2-05 = 10 [MFDO Function Select = Alarm] will be ON.
• Set the stopping method for this error in L8-03 [Overheat Pre-Alarm Selection].
Code Name Causes Possible Solutions
oH2 External Overheat (H1-XX=B)
oH2 [External Overheat (H1-XX=B)] signal was
input from an external device.
1. Identify the external device that output the overheat alarm
and remove the cause of the problem.
2. Clear the Overheat Alarm (oH2) [H1-xx = B] that was set to
MFDI terminals S1 to S10.
Note:
If the drive detects this error, the terminal assigned to H2-01 to H2-05 = 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 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. • Examine the load level, acceleration/deceleration times, 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-xx [V/f Pattern Parameters] settings. Decrease the
values set in E1-08 [Mid Point A Voltage] and E1-10
[Minimum Output Voltage]. For motor 2, adjust E3-xx [V/f
Pattern for Motor 2] settings. Decrease the values set in E3-08
[Motor 2 Mid Point A Voltage] and E3-10 [Motor 2 Minimum
Output Voltage]. For motor 3, adjust E7-xx [V/f Pattern for
Motor 3] settings. Decrease the values set in E7-08 [Motor 3
Mid Point A Voltage] and E7-10 [Motor 3 Minimum Output
Voltage].
Note:
If Ex-08 and Ex-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 H2-05 = 10 [MFDO Function Select = Alarm] will be ON.
• 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].
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 the overtorque detection parameters.
Note:
• The drive detects this error if the motor current and torque are more than the value set in S6-02 for longer than S6-03.
• If the drive detects this error, the terminal assigned to H2-01 to H2-05 = 10 [MFDO Function Select = Alarm] will be ON.
• Set the conditions that trigger the minor fault using S6-01 [OverT Detect Operation Select 1].
Code Name Causes Possible Solutions
oL4 Overtorque 2
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 the overtorque detection parameters.
Note:
• The drive detects this error if the motor current and torque are more than the value set in S6-05 [Overtorque Detection Level 2] for longer than S6-06 [Overtorque Detection
Time 2].
• If the drive detects this error, the terminal assigned to H2-01 to H2-05 = 10 [MFDO Function Select = Alarm] will be ON.
• Set the conditions that trigger the minor fault using S6-04 [OverT Detect Operation Select 2].