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.
LED Operator Display Fault Name
oPr
External Digital Operator Connection Fault
The external operator has been disconnected from the drive.
Note: An oPr fault will occur when both 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)
Cause Possible Solution
External operator is not properly connected to
the drive.
• Check the connection between the operator and the drive
• Replace the cable if damaged
• Turn off the drive input power and disconnect the operator. Next reconnect the operator and turn the
drive input power back on.
LED Operator Display Fault Name
ov
Overvoltage
Voltage in the DC bus has exceeded the overvoltage detection level.
•
For 200 V class: approximately 410 V
• For 400 V class: approximately 820 V (740 V when E1-01 is less than 400)
Cause Possible Solution
6.4 Fault Detection
YASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manual
137
6
Troubleshooting
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