YASKAWA A1000 Technical Manual page 135

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
The output voltage is too high
The wrong motor rated current is set to E2-01
The maximum output frequency is set
incorrectly
Multiple motors are running off the same drive Disable the motor protection function (L1-01 = 0) and 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
Speed Search related parameters are set
incorrectly
Output current fluctuation due to input phase
loss
Digital Operator Display
Cause
Load is too heavy
Acceleration or deceleration times are too
short
The output voltage is too high
Drive capacity is too small
Overload occurred when operating at low
speeds
Excessive torque compensation
Speed Search related parameters are set
incorrectly
Output current fluctuation due to input phase
loss
Digital Operator Display
YASKAWA ELECTRIC TOEP C710616 41B YASKAWA AC Drive - A1000 Quick Start Guide
Motor Overload
oL1
The electronic motor overload protection tripped.
Reduce the load.
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.
• Adjust the user-set V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10.
• Do not set E1-08 and E1-10 too low. This reduces load tolerance at low speeds.
• Check the motor-rated current.
• Enter the value written on the motor nameplate to parameter E2-01.
• Check the rated frequency indicated on the motor nameplate.
• Enter the rated frequency to E1-06 (Base Frequency).
• 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 losses 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.
• 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, enable Speed Estimation Speed Search (b3-24 = 1).
Check the power supply for phase loss.
Drive Overload
oL2
The thermal sensor of the drive triggered overload protection.
Reduce the load.
Increase the settings for the acceleration and deceleration times (C1-01 through C1-08).
• Adjust the preset V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10.
• Do not lower E1-08 and E1-10 excessively. This reduces load tolerance at low speeds.
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 (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 the drive, enable the Speed Estimation Speed Search (b3-24 = 1).
Check the power supply for phase loss.
Overtorque Detection 1
oL3
The current has exceeded the value set for torque detection (L6-02) for longer than the allowable time
(L6-03).
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
5.2 Fault Detection
5
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