YASKAWA FSDrive-MV1000 Instructions Manual page 135

Digital Operator Display
oL2
Cause
Load is too heavy.
Acceleration or deceleration times are too
short.
The output voltage is too high.
Drive capacity is too small.
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
Inappropriate parameter settings.
Fault on the machine side (e.g., machine is
locked up).
Digital Operator Display
oL4
Cause
Inappropriate parameter settings.
Fault on the machine side (e.g., machine is
locked up).
Digital Operator Display
oL5
Cause
Overtorque triggered mechanical weakening
detection level set to L6-08.
YASKAWA ELECTRIC EZZ010928 FSDrive-MV1000 Instructions
Drive Overload
The thermal sensor of the drive triggered overload protection.
Possible Solutions
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.
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 Estimation Speed
Search (b3-24 = 1).
Check the power supply for phase loss.
Overtorque 1
Drive output current (or torque in OLV, CLV, AOLV/PM, CLV/PM) was greater than L6-02
for longer than the time set in L6-03.
Possible Solutions
⇒Check parameters L6-02 and L6-03.
Check the status of the machine.
⇒Remove the cause of the fault.
Overtorque 2
Drive output current (or torque in OLV, CLV, AOLV/PM, CLV/PM) was greater than L6-05
for longer than the time set in L6-06.
Possible Solutions
⇒Check parameters L6-05 and L6-06.
Check the status of the machine.
⇒Remove the cause of the fault.
Mechanical Weakening Detection 1
Overtorque occurred, matching the conditions specified in L6-08.
Possible Solutions
Check for the cause of mechanical weakening.
Minor Fault Name
Minor Fault Name
Minor Fault Name
Minor Fault Name
5.5 Alarm Detection
Minor Fault
Output
H2- =10
Yes
Minor Fault
Output
H2- =10
Yes
Minor Fault
Output
H2- =10
Yes
Minor Fault
Output
H2- =10
Yes
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