6.4 Fault Detection
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 345
Digital Operator Display Fault Name
<2>
oH5
Motor Overheat (NTC Input)
The motor t
emperature exceeded the level set in L1-16 (or L1-18 for motor 2).
Cause Possible Solution
Motor has overheated.
• Reduce the load.
• Check the ambient temperature.
Digital Operator Display Fault Name
oL1
Motor Overload
The electroni
c motor overload protection tripped.
Cause Possible Solution
Load is too heavy.
Re
duce the load.
Note: After the value of U4-16 has decreased to one less than 100, reset oL1. The value of U4-16 must be less than 100 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 too high load.
• Reduce the load.
• Increase the speed.
• If the motor is supposed to operate at low speeds, either increas
e 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 value written on the moto
r nameplate to parameter E2-01.
Multiple motors are running off the same drive. Disable the motor prot
ection function (L1-01 = 0) and 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 t
hat has been selected (L1-01).
• Install an external thermal relay.
The electrical thermal relay is operating at the wrong
le
vel.
• Check the current rating listed on the motor nameplate.
• Check the value set for the mo
tor rated current (E2-01).
Motor overheated by overexcitation operation.
• Overexcitation increases the motor losses and the motor temperature. If appli
ed 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 Decel
eration) to a value other than 4.
• Set n3-23 (Overexcitation Operation
Selection) to 0 (disabled).
Speed Search related parameters are set incorrectly.
• Check values set to Speed Sea
rch related parameters.
• Adjust the Speed Search current and Speed Se
arch deceleration times (b3-02 and b3-03 respectively).
• After Auto-Tuning, enable Speed Esti
mation Speed Search (b3-24 = 1).
Output current fluctuation due to power supply loss Check the power supply for phase loss.
Digital Operator Display Fault Name
oL2
Drive Overload
The t
hermal sensor of the drive triggered overload protection.
Cause Possible Solution
Load is too heavy. Reduce the load.
Ac
celeration or deceleration times are 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
(C4-01) until there is no speed loss but less current.
Speed Search related parameters are set incorrectly.
• Check the settings for all Speed Search related parameters.
• Adjust the current used during Speed Search and the Speed Sear
ch deceleration time (b3-03 and b3-02 respectively).
• After Auto-Tuning the drive, enable the Speed Es
timation Speed Search (b3-24 = 1).
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 (L6-02) for longer than the allowable time (L6-03).
Cause Possible Solution
Parameter settings are not appropriate for the load. Check the settings of parameters L6-02 and L6-03.
Fault on the machine side (e.g., machine is locked up). Check the status of the load. Remove the cause of the fault.
Digital Operator Display Fault Name
oL4
Overtorque Detection 2
The current
has exceeded the value set for Overtorque Detection 2 (L6-05) for longer than the allowable time (L6-06).
Cause Possible Solution
Parameter settings are not appropriate for the load. Check the settings of parameters L6-05 and L6-06.
Digital Operator Display Fault Name
oL5
Mechanical Weakening
Detection 1
Overtorque occurred, matching the conditions specified in L6-08.
Cause Possible Solution
Overtorque triggered mechanical weakening detection
le
vel set to L6-08.
Check for the cause of mechanical weakening.
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