YASKAWA FSDrive-MV1000 Series Instructions For Use Manual page 157

Digital Operator Display
oL1
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.
When using a general-purpose motor, the
operation with less than rated current could
result in the overload at the time of low-speed
operation.
When using the drive dedicated motor, L1-01
(Motor Overload Protection Selection) was 1
(General-purpose motor).
The wrong motor rated current is set to E2-01.
The base frequency setting is too low.
Multiple motors are running off the same the
drive.
The electrical thermal protection characteristics
and motor overload characteristics do not match.
The electrical thermal relay is operating at the
wrong level.
Speed Search related parameters are set
incorrectly.
Output current fluctuation due to phase loss in
the input power supply
Digital Operator Display
oL2
Cause
Load is too heavy.
Cycle times are too short during acceleration and
deceleration.
Overload occurred when operating at low
speeds.
Excessive torque compensation
Speed Search related parameters are set
incorrectly.
Output current fluctuation due to input phase
loss
Digital Operator Display
oL3
Cause
Parameter settings are not appropriate for the
load.
Fault on the machine side (e.g., machine is
locked up)
YASKAWA ELECTRIC TOEP C710687 02B FSDrive-MV1000 Instructions
Motor Overload
The electronic motor overload protection tripped.
Reduce the load.
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.
Set L1-01 to 2.
• 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).
Set L1-01 to 0 to disable the motor protection function and then 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 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, set b3-24 to 1 to enable the Speed Estimation Speed Search.
Check whether input phase loss is present and improve the phase loss.
Drive Overload
The thermal sensor of the drive triggered overload protection.
• Check the size of the load.
• Reduce the load.
• Check the acceleration/deceleration time and cycle time.
• Increase the acceleration and deceleration times (C1-01 through C1-08).
Reduce the load when operating at low speeds.
• Check the amount of torque compensation.
• Reduce the torque compensation gain (C4-01) until there is no speed loss but less current.
• Check the settings for all Speed Search related parameters.
• Adjust the current used during Speed Search (b3-03) and the Speed Search deceleration time
(b3-02).
• After Auto-Tuning the drive, set b3-24 to 1 to enable Speed Estimation Speed Search.
Check the power supply for phase loss.
Overtorque Detection 1
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 machine.
• Remove the cause of the fault.
Fault Name
Possible Solutions
Fault Name
Possible Solutions
Fault Name
Possible Solutions
5.4 Fault Detection
5
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