YASKAWA V1000 Series Installation & Start-Up Manual page 218

5.5 Fault Detection
Cause
Overshoot or undershoot is
occurring.
Incorrect PG pulse settings.
Inappropriate parameter settings.
LED Operator Display
Cause
Deceleration time is too short and
regenerative energy flows from the
motor into the drive.
Acceleration time is too short.
Excessive braking load.
Surge voltage entering from the
drive input power.
Ground fault in the output circuit
causing the DC bus capacitor to
overcharge.
Speed Search related parameters are
not set properly.
(Includes Speed Search after a
momentary power loss and after a
fault restart.)
Excessive regeneration when
overshoot occurs after acceleration.
Drive input power voltage is too
high.
The dynamic braking transistor is
damaged.
218
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07)
• Adjust the gain by using the pulse train input parameters
(H6-02 through H6-05).
• Increase the settings for C5-01 (Speed Control Proportional Gain 1) and
reduce C5-02 (Speed Control Integral Time 1).
Set the H6-02 (Pulse Train Input Scaling) = 100%, the number of pulses during
maximum motor revolutions.
Check the setting for the overspeed detection level and the overspeed detection
time (F1-08 and F1-09).
Overvoltage
Voltage in the DC bus has exceeded the overvoltage detection level.
ov
For 200 V class: approximately 410 V
For 400 V class: approximately 820 V (740 V when E1-01 is less than 400)
• Increase the deceleration time (C1-02, -04, -06, -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.
• Check if sudden drive acceleration triggers an overvoltage alarm.
• Increase the acceleration time.
• Use longer S-curve acceleration and deceleration times.
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.
Install a DC reactor. Note: Voltage surge can result from a thyristor convertor
and a phase advancing capacitor operating on the same drive main input power
supply.
• Check the motor wiring for ground faults.
• Correct grounding shorts and turn the power back on.
• Check the settings for Speed Search related parameters.
• Enable the Speed Search Retry function
• (b3-19 is 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").
• Enable the Overvoltage Suppression function (L3-11 = "1").
Lengthen the S curve at acceleration end.
• Check the voltage.
• Lower the voltage of the drive input power to within the limits listed in the
specifications.
Replace the drive.
Possible Solution
Fault Name
Possible Solution