YASKAWA V1000 Technical Manual page 261

Speed Search related parameters are not set
to the proper values.
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.
Speed Search related parameters are not set
correctly.
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
Parameter settings are not appropriate for the
type of load.
LED Operator Display
Cause
Overtorque occurred, triggering the
mechanical weakening level set to L6-08.
LED Operator Display
Cause
Excessive load inertia.
Motor is driven by the load.
Something on the load side is restricting
deceleration.
The overload time during High-slip Braking
is too short.
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
• 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, enable Speed Estimation Type Search (b3-24 = "1").
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). 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 settings for all Speed Search related parameters.
• Adjust the current used during Speed Search and the Speed Search deceleration time (b3-03 and
b3-02 respectively).
• After Auto-Tuning the drive, enable the Speed Search Estimation Type (b3-24 = "1").
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.
Mechanical Weakening Detection 1
oL5
Overtorque occurred, matching the conditions specified in L6-08.
Check for the cause of mechanical weakening.
High-Slip Braking oL
oL7
The output frequency stayed constant for longer than the time set in n3-04 during High-slip Braking.
• Reduce deceleration times using parameters C1-02, -04, -06 and -08 in applications that do not use
High-slip Braking.
• Use a braking resistor to shorten deceleration time.
• Increase parameter n3-04 (High-slip Braking Overload Time).
• Install a thermal relay and increase the parameter setting of n3-04 to the maximum value.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
6.4 Fault Detection
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