Omron Q2A Installations- Und Bedienungsanleitung Seite 21

Code Name
ov Overvoltage
PF Input Phase Loss
TOMPYEUOQ2A03C AC Drive Q2A Installation and Operation Instructions
Causes
Deceleration time is too short and regenerative
energy is flowing from the motor into the drive.
The acceleration time is too short.
The braking load is too large.
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).
If the drive detects ov in these conditions, the speed
search-related parameters are incorrect:
• During speed search
• During momentary power loss recovery
• When the drive starts again automatically
The power supply voltage is too high.
The braking resistor or braking resistor unit wiring
is incorrect.
The encoder cable is disconnected or wired
incorrectly.
Noise interference along the encoder cable.
Electrical interference caused a drive malfunction.
The load inertia is set incorrectly.
The Short Circuit Braking function used in OLV/
PM control method.
There is motor hunting.
Speed search does not complete at start when you
use an induction motor in EZOLV control.
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.
Possible Solutions
• Set L3-04 = 1 [StallP@Decel Enable = Enabled] and L3-50 =
0 [StallP@Decel Mode = General Purpose].
• Increase the values set in C1-02 [Decel Time 1], C1-04 [Decel
Time 2], C1-06 [Decel Time 3], or C1-08 [Decel Time 4].
• Connect a dynamic braking option to the drive.
• Perform Deceleration Rate Auto-Tuning.
• Make sure that sudden drive acceleration does not cause the
fault.
• Increase the values set in C1-01 [Accel Time 1], C1-03 [Accel
Time 2], C1-05 [Accel Time 3], or C1-07 [Accel Time 4].
• Increase the value set in C2-02 [Jerk@End of Accel].
• Set L3-11 = 1 [Overvolt Supression Select = Enabled].
Connect a dynamic braking option to the drive.
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.
• Examine the settings for all speed search related parameters.
• Set b3-19 ≠ 0 [Speed Retry Times ≠ 0 times].
• Adjust b3-03 [SpSrch Deceleration Time] settings.
• Do Stationary Auto-Tuning for Line-to-Line Resistance and
then set b3-24 = 1 [SpSrch Method Selection = Speed
Estimation].
Decrease the power supply voltage to match the drive rated
voltage.
Correct wiring errors in the connection to the braking resistor or
braking resistor unit.
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
Isolate the encoder cable from the drive output line or a different
source of electrical interference.
• Examine the control circuit lines, main circuit lines, and
ground wiring, and decrease the effects of electrical
interference.
• Make sure that a magnetic contactor is not the source of the
electrical interference, then use a Surge Protective Device if
necessary.
• Examine the load inertia settings with KEB, overvoltage
suppression, or stall prevention during deceleration.
• Adjust L3-25 [Load Inertia Ratio] to match the qualities of the
machine.
Connect a braking resistor to the drive.
• Adjust n1-02 [HuntPrev Gain Setting] settings.
• Adjust n2-02 [AFR Time 1] and n2-03 [AFR Time 2] settings.
• Adjust n8-45 [SpdFbck Det.Gain] and n8-47 [Pull-In Comp.
Time Constant] settings.
When E9-01 = 0 [Motor Type Selection = IM], set b3-24 = 2
[SpSrch Method Selection = Current Det2].
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.
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