Although a special type of motor is being
used, the motor protection selection is set for
a general-purpose motor (L1-01 = 1).
Set L1-01 = “2”.
Voltage is too high for the V/f characteristics.
• Adjust the user set V/f patterns (E1-04 through E1-10). Parameters E1-08 and E1-10 may need to
be reduced.
• If E1-08 and E1-10 are set too high, there may be very little load tolerance at low speed.
The wrong motor-rated current is set to
E2-01.
• Check the motor-rated current.
• Enter the value written on the motor nameplate to parameter E2-01.
The maximum frequency for the drive input
power is set too low.
• Check the rated frequency indicated on the motor nameplate.
• Enter the rated frequency to E1-06 (Base Frequency).
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.
• Check the motor characteristics.
• Correct the value set to L1-01 (Motor Protection Function).
• 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 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.
Speed Search related parameters are not set
to the proper values.
• 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”).
Output current fluctuation due to input phase
loss
Check the power supply for phase loss.
LED 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.
Cycle times are too short during acceleration
and deceleration.
Increase the settings for the acceleration and deceleration times (C1-01 through C1-08).
Voltage is too high for the V/f characteristics.
• 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.
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 not set
correctly.
• 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”).
Output current fluctuation due to input phase
loss
Check the power supply for phase loss.
LED 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
type of load.
Check the settings of parameters L6-02 and L6-03.
There is a fault on the machine side (e.g., the
machine is locked up).
Check the status of the load. Remove the cause of the fault.
LED 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
type of load.
Check the settings of parameters L6-05 and L6-06.
LED Operator Display Fault Name
oL5
Mechanical Weakening Detection 1
Overtorque occurred, matching the conditions specified in L6-08.
Cause Possible Solution
Overtorque occurred, triggering the
mechanical weakening level set to L6-08.
Check for the cause of mechanical weakening.
6.4 Fault Detection
236
SIEP C710606 20 OYMC AC Drive - V1000 User Manual
7/16/2008-13:23
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