7.5 Minor Faults/Alarms
244 SIEPCYEUOQ2V01A Q2V 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 C1-01 to C1-08 [Acceleration/
Deceleration Times].
• 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 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
A Voltage] and E1-10 [Min 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:
• The drive detects this fault if the motor overheat signal input from analog input terminal AI1 or AI2 is more than the fault detection level.
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 4 [MFDO Function Select = 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 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].
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 set to H2-01 to H2-03 = 4 [MFDO Function Select = Alarm] will activate.
• 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].
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 set to H2-01 to H2-03 = 4 [MFDO Function Select = Alarm] will activate.
• 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 set to H2-01 to H2-03 = 4 [MFDO Function Select = Alarm] will activate.
• If the drive detects this error, 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 H6-02 to H6-05 [Pulse Train
Input Setting Parameters].
There is 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 set to H2-01 to H2-03 = 4 [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 F1-03 [Overspeed Detection Selection].
Code Name Causes Possible Solutions
ov Overvoltage
There are surge voltages in the input power supply. Connect a DC reactor to the drive.
Note:
If you turn the phase advancing capacitors ON and OFF and
use thyristor converters in the same power supply system,
there can be surge voltages that irregularly increase the input
voltage.
The drive output cable or motor is shorted to ground
(the current short to ground is charging the main
circuit capacitor of the drive through the power
supply).
1. Examine the motor main circuit cable, terminals, and motor
terminal box, and then remove ground faults.
2. Re-energize the drive.
The power supply voltage is too high. Decrease the power supply voltage to match the drive rated
voltage.
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