7.5 Minor Faults/Alarms
280 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
Code Name Causes Possible Solutions
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 Acceleration/Deceleration Times C1-
01 to C1-08.
• Set E2-01 [Mot 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 V/f Pattern Parameters E1-04 to E1-10. For motor 2,
adjust E3-04 to E3-10. Decrease the values set in E1-08 [Mid
A Voltage] and E1-10 [Min Output Voltage].
Note:
If the values set in E1-08 and E1-10 are too low, the load
tolerance will decrease when operating the drive in the low
speed range.
Note:
• The drive detects this fault if the motor overheat signal that was entered to an analog input terminal A3 is more than the alarm detection level when H3-06 = 16 [AI3
Function Selection = Motor Temperature (PTC Input)].
• If the drive detects this error, the terminal assigned to H2-01, H2-02, and H2-03 = 4 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-4CM Funct Selection =
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 oH AL Reaction 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 [Trq Det1 Level] and L6-03 [Trq Det1 Time]
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, H2-02, and H2-03 = 4 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-4CM Funct Selection =
Alarm] will be ON.
• Set the conditions that trigger the minor fault using L6-01 [Trq Det1 Select].
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 L6-05 [Trq Det2 Level] and L6-06 [Trq Det2 Time]
settings.
Note:
• The drive detects this error if the drive output current is more than the level set in L6-05 for longer than L6-06.
• If the drive detects this error, the terminal assigned to H2-01, H2-02, and H2-03 = 4 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-4CM Funct Selection =
Alarm] will be ON.
• Set the conditions that trigger the minor fault using L6-04 [Trq Det2 Select].
Code Name Causes Possible Solutions
oL5 Mechanical Weakening Detection 1
The drive detected overtorque as specified by the
conditions for mechanical weakening detection set
in L6-08 [MechF Enable].
Do a deterioration diagnostic test on the machine side.
Note:
• If the drive detects this error, the terminal assigned to H2-01, H2-02, and H2-03 = 4 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-4CM Funct Selection =
Alarm] will be ON.
• If the drive detects this minor fault, it will operate the motor as specified by the Stopping Method set in L6-08.
Code Name Causes Possible Solutions
oS Overspeed
There is overshoot. • Decrease C5-01 [ASR PGain 1] and increase C5-02 [ASR
ITime 1].
• Adjust the pulse train gain with Pulse Train Input Setting
Parameters H6-02 to H6-05 [PI Frequency Scale to PI Filter
Time].
There are an incorrect number of PG pulses set in
the drive.
Set H6-02 [PI Frequency Scale] to the pulse train frequency
during 100% reference (maximum motor rotation speed).
The oS detection level is set incorrectly. Adjust F1-08 [Overspeed Level] and F1-09 [Overspeed Delay
Time].
Note:
• The drive detects this error if the motor speed is more than the value set in F1-08 for longer than F1-09.
• If the drive detects this error, the terminal assigned to H2-01, H2-02, and H2-03 = 4 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-4CM Funct Selection =
Alarm] will be ON.
• If the drive detects this error, it will operate the motor as specified by the Stopping Method set in F1-03 [Overspeed Detection Selection].
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