YASKAWA Z1000 User Manual page 216

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5.4 Fault Detection
HOA Keypad Display
External operator is not properly connected to the
drive
HOA Keypad Display
ov
Cause
Deceleration time is too short and regenerative
energy is flowing from the motor into the drive
Fast acceleration time causes the motor to
overshoot the speed reference
Ground fault in the output circuit causes the DC
bus capacitor to overcharge
Improper parameters related to Speed Search
(including Speed Search after a momentary power
loss and after a fault restart)
Drive input power voltage is too high
Drive fails to operate properly due to noise
interference
Load inertia is set incorrectly
Motor hunting occurs
HOA Keypad Display
ov2
Cause
The wiring is too long
HOA Keypad Display
PF
Cause
There is phase loss in the drive input power
216
• Check the connection between the operator and the drive.
• Replace the cable if damaged.
• Turn off the drive input power and disconnect the operator. Reconnect the operator and reapply
drive input power.
Overvoltage
Voltage in the DC bus has exceeded the overvoltage detection level.
• For 200 V class drives: approximately 410 V
• For 400 V class drives: approximately 820 V (740 V when E1-01 is less than 400)
• Increase the deceleration time (C1-02 and C1-04).
• Set L3-04 to 1 to enable stall prevention during deceleration. 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.
• Enable the Overvoltage Suppression function (L3-11 = 1).
• Lengthen the S-curve at acceleration end.
• Check the motor wiring for ground faults.
• Correct grounding shorts and reapply power.
• Check the settings for Speed Search-related parameters.
• Enable Speed Search restart 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 Stationary Auto-Tuning for line-to-line resistance and then set b3-14 to 1 to enable Speed
Estimation Speed Search.
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
• 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.
• Check the load inertia settings when using KEB, overvoltage suppression, or Stall Prevention
during deceleration.
• Adjust the load inertia ratio in L3-25 to better match the load.
• Adjust the parameters that control hunting.
• Set the gain for Hunting Prevention (n1-02).
• Adjust the speed feedback detection suppression gain for PM motors (n8-45) and the time constant
for pull-in current (n8-47).
Overvoltage 2
Bus voltage is boosted because the motor cable is too long.
• Shorten the shielded motor cable
• Lower the carrier frequency
• Switch on the internal EMC filter if the power supply has a neutral ground
Input Phase Loss
Drive input power has an open phase or has a large imbalance of voltage between phases. Detected
when L8-05 is set 1 (enabled).
• Check for wiring errors in the main circuit drive input power.
• Correct the wiring.
YASKAWA ELECTRIC TOEP C710616 45F YASKAWA AC Drive – Z1000 User Manual
Fault Name
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution

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