Digital Operator Display Fault Name
oL1
Motor Overload
The electronic motor overload protection tripped
Cause Possible Solution
Load is too heavy
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.
Cycle times are too short during acceleration
and deceleration
Increase the acceleration and deceleration times (C1-01 through C1-08).
A general-purpose motor is driven below the
rated speed with a high load
• 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.
V/f characteristics (voltage and frequency) are
not suitable
Set the V/f pattern setting parameters (E1-04 to E1-10) to match the motor characteristics.
The wrong motor rated current is set to E2-01
• Check the motor-rated current.
• Enter the motor rated current to parameter E2-01 as indicated on the motor nameplate.
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
• Check the motor characteristics.
• Correct the type of motor protection that has been selected (L1-01).
• Install an external thermal relay.
The electrical thermal relay is operating at the
wrong level
• Check the current rating listed on the motor nameplate.
• Check the value set for the motor rated current (E2-01).
Motor overheated by overexcitation operation
• 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).
Parameters related to Speed Search are set
incorrectly
• 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.
Output current fluctuation due to power
supply loss
Check the power supply for phase loss.
Digital Operator Display Fault Name
oL2
Drive Overload
The thermal sensor of the drive triggered overload protection.
Cause Possible Solution
Load is too heavy Reduce the load.
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 Set the V/f pattern setting parameters (E1-04 to E1-10) to match the motor characteristics.
Drive capacity is too small Replace the drive with a larger model.
Overload occurred when operating at low
speeds
• 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).
Excessive torque compensation Reduce the torque compensation gain in parameter C4-01 until there is no speed loss but less current.
Parameters related to Speed Search are set
incorrectly
• 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.
Output current fluctuation due to input phase
loss
Check the power supply for phase loss.
5.2 Fault Detection
YASKAWA ELECTRIC TOEP C710616 41G YASKAWA AC Drive - A1000 Quick Start Guide
189
5
Troubleshooting
To Next Page
Loading...
Need help?
General
