Omron J1000 User Manual page 128

6.4 Fault Detection
Motor overheated by overexcitation
operation.
Output current fluctuation due to input phase
loss
LED Operator Display
Cause
Load is too heavy.
Cycle times are too short during acceleration
and deceleration.
Voltage is too high for the V/f characteristics.
Drive capacity is too small.
Overload occurred when operating at low
speeds.
Excessive torque compensation.
Output current fluctuation due to input phase
loss
LED Operator Display
Cause
Parameter settings are not appropriate for the
type of load.
There is a fault on the machine side (e.g., the
machine is locked up).
LED Operator Display
Cause
External operator is not properly connected to
the drive.
LED Operator Display
Cause
Deceleration time is too short and
regenerative energy flows from the motor
into the drive.
Excessive braking load.
Surge voltage entering from the drive input
power.
Ground fault in the output circuit causing the
DC bus capacitor to overcharge.
Excessive regeneration when overshoot
occurs after acceleration.
Drive input power voltage is too high.
The dynamic braking transistor is damaged. Replace the drive.
The braking transistor is wired incorrectly.
Drive fails to operate properly due to noise
interference.
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• 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.
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 C1-04).
• 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 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).
Check the settings of parameters L6-02 and L6-03.
Check the status of the load. Remove the cause of the fault.
External Digital Operator Connection Fault
The external operator has been disconnected from the drive.
oPr
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)
• 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.
Overvoltage
Voltage in the DC bus has exceeded the overvoltage detection level.
ov
• For 200 V class: approximately 410 V
• For 400 V class: approximately 820 V (740 V when E1-01 is less than 400)
• Increase the deceleration time (C1-02, -04).
• Install a braking resistor or a dynamic braking resistor unit.
• Enable stall prevention during deceleration (L3-04 = "1").
Stall prevention is enabled as the default setting.
The braking torque was too high, causing regenerative energy to charge the DC bus.
Reduce the braking torque, use a braking option, or lengthen decel time.
Install a DC reactor.
Note: Voltage surge can result from thyristor convertor and phase advancing capacitor using same
drive main input power supply.
• Check the motor wiring for ground faults.
• Correct grounding shorts and turn the power back on.
• Lengthen the S-curve at acceleration end.
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
• Check braking transistor wiring for errors.
• Properly rewire the braking resistor device.
• Review the list of possible solutions provided for controlling noise.
• Review the section on handling noise interference and check the control circuit lines, main circuit
lines and ground wiring.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
SIEP C710606 33A OYMC AC Drive – J1000 User Manual