Omron Q2A Series Technical Manual page 281

Code Name
ov DC Bus Overvoltage
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 [2NO-2CM Func Selection, 3NO-3CM Func Selection, and 4NO-4CM Funct Selection =
Alarm] will be ON.
Code Name
PASS Modbus Communication Test
Code Name
PF Input Phase Loss
Note:
• The drive detects this error if the DC bus voltage changes irregularly without regeneration.
• 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.
• Use L8-05 [In PhaseLoss Selection] to enable and disable PF detection.
Code Name
PGo Encoder (PG) Feedback Loss
Note:
• The drive detects this error if it does not receive the speed detection pulse signal from the encoder in the detection time set in F1-14 [Enc PGOpen Time for Detection].
• 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 F1-02 [PGOpen Detection Select].
Code Name
PGoH Encoder (PG) Hardware Fault
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 F1-02 [PGOpen Detection Select].
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
Causes
There are surge voltages in the input power supply.
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).
The power supply voltage is too high.
Electrical interference caused a drive malfunction.
Causes
The Modbus communications test is complete.
Causes
There is a phase loss in the drive input power.
Loose wiring in the input power terminals.
The drive input power voltage is changing too
much.
Unsatisfactory balance between voltage phases.
The main circuit capacitors have become
unserviceable.
Causes
The encoder cable is disconnected or wired
incorrectly.
The encoder is not receiving power.
The holding brake is stopping the motor.
Causes
The encoder cable is disconnected.
7.5 Minor Faults/Alarms
Possible Solutions
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.
1. Examine the motor main circuit cable, terminals, and motor
terminal box, and then remove ground faults.
2. Re-energize the drive.
Decrease the power supply voltage to match the drive rated
voltage.
• 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].
Possible Solutions
The PASS display will turn off after communications test mode is
cleared.
Possible Solutions
Correct errors with the wiring for main circuit drive input power.
Tighten the terminal screws to the correct tightening torque.
• Examine the input power for problems.
• Make the drive input power stable.
• 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.
• Examine the capacitor maintenance time in monitor U4-05
[Capacitor Maintenance].
• If U4-05 is more than 90%, replace the capacitor. Contact the
manufacturer or your nearest sales representative for more
information.
• Examine the input power for problems.
• Re-energize the drive.
• If the alarm stays, replace the circuit board or the drive.
Contact the manufacturer or your nearest sales representative
for more information.
Possible Solutions
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
Examine the encoder power supply.
Release the holding brake.
Possible Solutions
Correct any disconnected wires in the encoder cable.
7
281