YASKAWA V1000 Quick Start Manual page 140

5.2 Fault Detection
Motor overheated by
overexcitation operation.
Speed Search related parameters
are not set to the proper values.
Output current fluctuation due to
input phase loss
Cause
Load is too heavy.
Cycle times are too short during
acceleration and deceleration.
Voltage is too high for the V/f
characteristics.
Drive capacity is too small.
Overload occurred when operating
at low speeds.
Excessive torque compensation.
Speed Search related parameters
are not set correctly.
Output current fluctuation due to
input phase loss
140
• Overexcitation increases the motor losses and the motor temperature. If applied
too long, motor damage can occur. 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 Type 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). This will mainly involve
reducing E1-08 and E1-10.
• Be careful not to lower E1-08 and E1-10 excessively because 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 and the Speed Search deceleration
time (b3-03 and b3-02 respectively).
• After Auto-Tuning the drive, enable the Speed Search Estimation Type (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).
Overtorque Detection 2
oL4
The current has exceeded the value set for Overtorque Detection 2 (L6-05) for
longer than the allowable time (L6-06).
Mechanical Weakening Detection 1
oL5
Overtorque occurred, matching the conditions specified in L6-08.
YASKAWA ELECTRIC TOEP C710606 47A YASKAWA AC Drive – V1000 Quick Start Guide
Possible Solution