YASKAWA A1000 Series Quick Start Manual page 106

5 Troubleshooting
Multiple motors are running off the same
drive.
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
106
Disable the motor protection function (L1-01 = 0) and install a thermal relay to each motor.
• 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. 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 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). 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 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).
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.
High Slip Braking oL
oL7
The output frequency stayed constant for longer than the time set in n3-04 during High Slip Braking.
External Digital Operator Connection Fault
• The external operator has been disconnected from the drive.
oPr
Note: An oPr fault will occur when all of the following conditions are true:
• Output is interrupted when the operator is disconnected (o2-06 = 1).
• The Run command is assigned to the operator (b1-02 = 0 and LOCAL has been selected).
Overspeed (for Control Mode with PG)
oS
The motor speed feedback exceeded the F1-08 setting.
Fault Name
Possible Solution
Fault Name
YASKAWA ELECTRIC TOEP C710616 21C YASKAWA AC Drive - A1000 Quick Start Guide