YASKAWA L1000A Technical Manual page 294

6.3 Fault Detection
Digital Operator Display
Cause
Motor thermostat wiring is fault (PTC thermistor input). Repair the PTC thermistor input wiring.
There is a fault on the machine side (e.g., the machine is
locked up).
Motor has overheated.
Digital Operator Display
Cause
Load is too heavy.
Cycle times are too short during acceleration and
deceleration.
A general purpose motor is driven below the rated speed
with too high load.
The output voltage is too high.
The wrong motor rated current is set to E2-01.
The Base Frequency is set incorrectly.
Multiple motors are running off the same drive.
The electrical thermal protection characteristics and
motor overload characteristics do not match.
The electrical thermal relay is operating at the wrong
level.
Output current fluctuation due to power supply loss
Digital Operator Display
Cause
Load is too heavy.
Accel/decel ramp is too short.
The output voltage is too high.
Drive capacity is too small.
Overload occurred when operating at low speeds.
Excessive torque compensation.
Output current fluctuation due to input phase loss
Digital Operator Display
Cause
Parameter settings are not appropriate for the load.
Fault on the machine side (e.g., machine is locked up).
Digital Operator Display
Cause
Parameter settings are not appropriate for the load.
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Motor Overheat Fault (PTC thermistor input)
oH4
• The motor overheat signal to analog input terminal A1 or A2 exceeded the fault detection level.
• Detection requires that multi-function analog input H3-02 or H3-10 = "E".
• Check the status of the machine.
• Remove the cause of the fault.
• Check the size of the load, the accel/decel times, and the cycle times.
• Decrease the load.
• Increase the acceleration and deceleration times (C1-01 through C1-08).
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 too much because this reduces load tolerance at low speeds.
• Check the motor rated current.
• Enter the motor rated current as indicated on the motor nameplate (E2-01).
• Ensure the motor cooling system is operating normally.
• Repair or replace the motor cooling system.
Motor Overload
oL1
The electronic motor overload protection tripped.
Reduce 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.
Increase the acceleration and deceleration times (C1-01 through C1-08).
• Reduce the load.
• Increase the speed.
• If the motor is supposed to operate at low speeds, either increase the motor capacity or use a motor specifically designed to
operate in the desired speed range.
• Adjust the user-set V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10.
• Do not set E1-08 and E1-10 too low. This reduces load tolerance at low speeds.
• Check the motor-rated current.
• Enter the value written on the motor nameplate to parameter E2-01.
• Check the rated frequency indicated on the motor nameplate.
• Enter the rated frequency to E1-06 (Base Frequency).
Disable the motor protection function (L1-01 = 0) and install a thermal relay to each motor.
• Check the motor characteristics.
• Correct the type of motor protection that has been selected (L1-01).
• Install an external thermal relay.
• Check the current rating listed on the motor nameplate.
• Check the value set for the motor rated current (E2-01).
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 C1-08).
• Adjust the preset V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10.
• Do not lower E1-08 and E1-10 excessively. 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 (C6-03).
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.
Overtorque Detection 2
oL4
The current has exceeded the value set for Overtorque Detection 2 (L6-05) for longer than the allowable time (L6-06).
Check the settings of parameters L6-05 and L6-06.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual