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.
The output voltage is too high
• 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.
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.
The base frequency is set incorrectly
• Check the rated frequency indicated on the motor nameplate.
• Enter the rated frequency to E1-06 (Base Frequency).
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.
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 C1-04).
The output voltage is too high
• 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.
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.
Digital Operator Display Fault Name
oL3
Overtorque Detection 1
The current has exceeded the value set for Torque Detection Level 1 (L6-02) for longer than the allowable
time (L6-03).
Cause Possible Solution
Parameter settings are not appropriate for the
load
Check L6-02 and L6-03 settings.
Fault on the machine side (e.g., machine is
locked up)
Check the status of the load. Remove the cause of the fault.
6.4 Fault Detection
304
YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
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