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Cause

Possible Solution

HOA keypad is not properly connected to

the drive

• Check the connection between the keypad and the drive.
• Replace the cable if damaged.
• Turn off the drive input power and disconnect the keypad. Reconnect the keypad and reapply drive input

power.

HOA Keypad Display

Fault Name

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)
• For 600 V class drives: approximately 1040 V

Cause

Possible Solution

Deceleration time is too short and

regenerative energy is flowing from the

motor into the drive

• Increase the deceleration time (C1-02 and C1-04).
• Install a dynamic braking resistor or a dynamic braking resistor unit.
• Set L3-04 to 1 to enable stall prevention during deceleration. 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.
• Enable the Overvoltage Suppression function (L3-11 = 1).
• Lengthen the S-curve at acceleration end.

Excessive braking load

The braking torque was too high, causing regenerative energy to charge the DC bus. Reduce the braking

torque, use a dynamic 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 a thyristor convertor and phase advancing capacitor using the

same input power supply.

Ground fault in the output circuit causes the

DC bus capacitor to overcharge

• Check the motor wiring for ground faults.
• Correct grounding shorts and reapply power.

Improper parameters related to Speed

Search (including Speed Search after a

momentary power loss and after a fault

restart)

• 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.

Drive input power voltage is too high

• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.

The braking transistor or braking resistor

are wired incorrectly

• Check braking transistor and braking resistor 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 is set incorrectly

• 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.

Motor hunting occurs

• Adjust the parameters that control hunting.
• Set the gain for Hunting Prevention (n1-02).
• Adjust the AFR time constant (n2-02 and n2-03).

HOA Keypad Display

Fault Name

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).

Cause