7.5 Minor Faults/Alarms
292 SIEPYEUOQ2A01G AC Drive Q2A Technical Manual
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 [Multi-Function Digital Output 1, Multi-Function Digital Output 2, and Multi-Function
Digital Output 3 = 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 [Multi-Function Digital Output 1, Multi-Function Digital Output 2, and Multi-Function
Digital Output 3 = 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 [Multi-Function Digital Output 1, Multi-Function Digital Output 2, and Multi-Function
Digital Output 3 = 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].
Code Name Causes Possible Solutions
ov DC Bus 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.
Electrical interference caused a drive malfunction. • Examine the control circuit lines, main circuit lines, and
ground wiring, and decrease the effects of electrical
interference.
• Check whether a magnetic contactor is the noise source, and
use Surge Protective Device if necessary.
• Set L5-01 ≠ 0 [Auto-Reset Attempts ≠ 0 times].
Note:
• The drive detects this error if the DC bus voltage is more than the ov detection level when the Run command has not been input (while the drive is stopped).
• The ov detection level is approximately 410 V with 200 V class drives. The detection level is approximately 820 V with 400 V class drives.
• If the drive detects this error, the terminal assigned to H2-01, H2-02, and H2-03 = 4 [Multi-Function Digital Output 1, Multi-Function Digital Output 2, and Multi-Function
Digital Output 3 = Alarm] will be ON.
Code Name Causes Possible Solutions
PASS Modbus Communication Test
The Modbus communications test is complete. The PASS display will turn off after communications test mode is
cleared.
Code Name Causes Possible Solutions
PF Input Phase Loss
There is a phase loss in the drive input power. Correct errors with the wiring for main circuit drive input power.
Loose wiring in the input power terminals. Tighten the terminal screws to the correct tightening torque.
The drive input power voltage is changing too
much.
• Examine the input power for problems.
• Make the drive input power stable.
Unsatisfactory balance between voltage phases. • Examine the input power for problems.
• Make the drive input power stable.
• If the input power supply is good, examine the magnetic
contactor on the main circuit side for problems.
To Next Page
Loading...
Need help?
General