YASKAWA A1000 Series Quick Start Manual page 189

Digital Operator Display
Cause
Load is too heavy
Cycle times are too short during acceleration
and deceleration
A general-purpose motor is driven below the
rated speed with a high load
V/f characteristics (voltage and frequency) are
not suitable
The wrong motor rated current is set to E2-01
Multiple motors are running off the same drive Set L1-01 to 0 to disable the motor protection function and then install a thermal relay to each motor.
The electrical thermal protection
characteristics and motor overload
characteristics do not match
The electrical thermal relay is operating at the
wrong level
Motor overheated by overexcitation operation
Parameters related to Speed Search are set
incorrectly
Output current fluctuation due to power
supply loss
Digital Operator Display
Cause
Load is too heavy
Acceleration or deceleration time is too short Increase the settings for the acceleration and deceleration times (C1-01 through C1-08).
V/f characteristics (voltage) are not suitable
Drive capacity is too small
Overload occurred when operating at low
speeds
Excessive torque compensation
Parameters related to Speed Search are set
incorrectly
Output current fluctuation due to input phase
loss
YASKAWA ELECTRIC TOEP C710616 41G YASKAWA AC Drive - A1000 Quick Start Guide
Motor Overload
oL1
The electronic motor overload protection tripped
Reduce the load.
Note: Reset oL1 when the U4-16 value falls below 100.0%. U4-16 value must be less than 100.0%
before oL1 can be reset.
Increase the acceleration and deceleration times (C1-01 through C1-08).
• Reduce the load.
• Increase the speed.
• If the motor is supposed to operate at low speeds, either increase the motor capacity or use a motor
specifically designed to operate in the desired speed range.
Set the V/f pattern setting parameters (E1-04 to E1-10) to match the motor characteristics.
• Check the motor-rated current.
• Enter the motor rated current to parameter E2-01 as indicated on the motor nameplate.
• Check the motor characteristics.
• Correct the type of motor protection that has been selected (L1-01).
• Install an external thermal relay.
• Check the current rating listed on the motor nameplate.
• Check the value set for the motor rated current (E2-01).
• Overexcitation increases the motor loss and the motor temperature. Excessive duration of
overexcitation may cause motor damage. Prevent excessive overexcitation operation or apply proper
cooling to the motor.
• Reduce the excitation deceleration gain (n3-13).
• Set L3-04 (Stall Prevention during Deceleration) to a value other than 4.
• Set n3-23 (Overexcitation Operation Selection) to 0 (disabled).
• Check values set to Speed Search related parameters.
• Adjust the Speed Search current and Speed Search deceleration times (b3-02 and b3-03 respectively).
• After Auto-Tuning, set b3-24 to 1 to enable Speed Estimation Speed Search.
Check the power supply for phase loss.
Drive Overload
oL2
The thermal sensor of the drive triggered overload protection.
Reduce the load.
Set the V/f pattern setting parameters (E1-04 to E1-10) to match the motor characteristics.
Replace the drive with a larger model.
• Reduce the load when operating at low speeds.
• Replace the drive with a model that is one frame size larger.
• Lower the carrier frequency (C6-02).
Reduce the torque compensation gain in parameter C4-01 until there is no speed loss but less current.
• Check the settings for all Speed Search related parameters.
• Adjust the current used during Speed Search (b3-03) and the Speed Search deceleration time (b3-02).
• After Auto-Tuning, set b3-24 to 1 to enable Speed Estimation Speed Search.
Check the power supply for phase loss.
Fault Name
Possible Solution
Fault Name
Possible Solution
5.2 Fault Detection
5
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