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 thereby 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.
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
C1-04).
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.
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.
5.4 Fault Detection
YASKAWA ELECTRIC TOEP C710606 25D YASKAWA AC Drive J1000 Installation & Start-Up Manual
143
5
Troubleshooting
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