Omron Q2A Series Technical Manual page 283

Code Name
UL5 Mechanical Weakening Detection 2
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 error, it will operate the motor as specified by the Stopping Method set in L6-08.
Code Name
Uv Undervoltage
Note:
• The drive detects this error if one of these conditions is correct when the Run command has not been input (while the drive is stopped).
–The DC bus voltage < L2-05 [UV Detection Lvl (Uv1)].
–The Contactor that prevents inrush current in the drive was opened.
–There is low voltage in the control drive input power.
• 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.
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
Causes
The drive detected undertorque as specified by the
conditions for mechanical weakening detection set
in L6-08 [MechF Enable].
Causes
The drive input power voltage is changing too
much.
There is a phase loss in the drive input power.
There is loose wiring in the drive input power
terminals.
There was a loss of power.
The main circuit capacitors have become
unserviceable.
The drive input power transformer is too small and
voltage drops when the power is switched on.
Air inside the drive is too hot.
The Charge LED is broken.
7.5 Minor Faults/Alarms
Possible Solutions
Examine the machine for deterioration.
Possible Solutions
• 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.
Correct errors with the wiring for main circuit drive input power.
Tighten the terminal screws to the correct tightening torque.
Use a better power supply.
Examine the capacitor maintenance time in monitor U4-05
[Capacitor Maintenance]. If U4-05 is more than 90%, replace the
control board or the drive. For information about replacing the
control board, contact the manufacturer or your nearest sales
representative.
• Check for an alarm when a molded-case circuit breaker,
Leakage Breaker (ELCB, GFCI, or RCM/RCD) (with
overcurrent protective function), or magnetic contactor is ON.
• Check the capacity of the drive power supply transformer.
Check the ambient temperature of the drive.
Replace the control board or the entire drive. For information
about replacing the control board, contact the manufacturer or
your nearest sales representative.
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