Yeskawa VFD Fault OV Overvoltage Voltage in the DC bus has exceeded the overvoltage detection level

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Overvoltage
Voltage in the DC bus has exceeded the overvoltage detection level.
• For 200 V class: approximately 410 V
• For 400 V class: approximately 820 V (740 V when E1-01 is less than 400)
Cause Possible Solution
Deceleration time is too short and regenerative
energy flows from the motor into the drive.
• Increase the deceleration time (C1-02, C1-04, C1-06, C1-08).
• Install a braking resistor or a dynamic braking resistor unit.
• Enable stall prevention during deceleration (L3-04 = “1”).
Stall prevention is enabled as the default setting.
Fast acceleration time causes the motor to
overshoot the speed reference.
• Check if sudden drive acceleration triggers an overvoltage alarm.
• Increase the acceleration time.
• Use longer S-curve acceleration and deceleration times.
Excessive braking load. The braking torque was too high, causing regenerative energy to charge the DC bus.
Reduce the braking torque, use a braking option, or lengthen decel time.
Surge voltage entering from the drive input
power.
Install a DC link choke.
Note: Voltage surge can result from thyristor convertor and phase advancing capacitor using same drive
main input power supply.
Ground fault in the output circuit causing the
DC bus capacitor to overcharge.
• Check the motor wiring for ground faults.
• Correct grounding shorts and turn the power back on.
Improper Setting of Speed Search related
parameters. (Includes Speed Search after a
momentary power loss and after a fault
restart.)
• Check the settings for Speed Search related parameters.
• Enable Speed Search Retry function
(b3-19 greater than or equal to 1 to 10).
• Adjust the current level during Speed Search and the deceleration time (b3-02 and b3-03 respectively).
• Perform Line-to-Line Resistance Auto-Tuning and then enable Speed Estimation Type Speed Search
(b3-24 = 1).
Excessive regeneration when overshoot
occurs after acceleration.
• Enable the Overvoltage Suppression function (L3-11 = 1).
• Lengthen the S-curve at acceleration end.
Drive input power voltage is too high.
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
The dynamic braking transistor is damaged. Replace the drive.
The braking transistor is wired incorrectly.
• Check braking transistor wiring for errors.
• Properly rewire the braking resistor device.
Drive fails to operate properly due to noise
interference.
• Review the list of possible solutions provided for controlling noise.
• Review the section on handling noise interference and check the control circuit lines, main circuit lines
and ground wiring.
Load inertia has been set incorrectly.
• Check the load inertia settings when using KEB, overvoltage suppression or Stall Prevention during
deceleration.
• Adjust L3-25 (Load Inertia Ratio) in accordance with the load.
Braking function is being used in PM Open
Loop Vector Control. Connect a braking resistor.
Motor hunting occurs.
• Adjust the parameters that control hunting.
• Set the hunting prevention gain (n1-02).
• Adjust the AFR time constant 1 (n2-02) and the AFR time constant 2 (n2-03) when in OLV Control.
• Use parameters n8-45 (PM Speed Feedback Detection Suppression Gain)
and n8-47 (Pull-In Current Compensation Time Constant).
BA0001B - BA0001F
BA0002B - BA0002F
BA0003B - BA0003F
BA0006B - BA0006F
BA0010B - BA0010F
BA0012B - BA0012F
BA0018B - BA0018F
2A0001B - 2A0001F
2A0002B - 2A0002F
2A0004B - 2A0004F
2A0006B - 2A0006F
2A0010B - 2A0010F
2A0012B - 2A0012F
2A0020B - 2A0020F
- 2A0030A 2A0030F
- 2A0040A 2A0040F
- 2A0056A 2A0056F
- 2A0069A 2A0069F
4A0001B - 4A0001F
4A0002B - 4A0002F
4A0004B - 4A0004F
4A0005B - 4A0005F
4A0007B - 4A0007F
4A0009B - 4A0009F
4A0011B - 4A0011F
- 4A0018A 4A0018F
- 4A0023A 4A0023F
- 4A0031A 4A0031F
- 4A0038A 4A0038F
BA0001B
BA0002B
BA0003B
2A0001B
2A0002B
2A0004B
2A0006B
BA0006B
BA0010B
BA0012B
BA0018B
2A0010B
2A0012B
2A0020B
4A0001B
4A0002B
4A0004B
4A0005B
4A0007B
4A0009B
4A0011B
2A0030A
2A0040A
2A0056A
2A0069A
4A0018A
4A0023A
4A0031A
4A0038A
43
IP20/NEMA Type 1
BA0001F
BA0002F
BA0003F
2A0001F
2A0002F
2A0004F
- 44
BA0006F
BA0010F
BA0012F
BA0018F
2A0006F
2A0010F
2A0012F
2A0020F
4A0001F
4A0002F
4A0004F 4A0005F 4A0007F 4A0009F 4A0011F 2A0030F 2A0040F 2A0056F 2A0069F 4A0018F 4A0023F 4A0031F 4A0038F
A1-02 Control Method Selection
b1-01 Frequency Reference Selection 1
b1-02 Run Command Selection 1
b1-03 Stop Method Selection
C1-01 Acceleration Time 1
C1-02 Deceleration Time 1
C6-01 Duty Selection
C6-02 Carrier Frequency Selection
d1-01 Frequency Reference 1
d1-02 Frequency Reference 2
d1-03 Frequency Reference 3
d1-04 Frequency Reference 4
d1-17 Jog Frequency Reference
E1-01 Input Voltage Reference
E1-03 V/f Pattern Selection
E1-04 Maximum Output Frequency
E1-05 Maximum Voltage
E1-06 Base Frequency
E1-09 Minimum Output Frequency
E1-13 Base Voltage
E2-01 Motor Rated Current
E2-04 Number of Motor Poles
E2-11 Motor Rate Capacity