YASKAWA GA700 Technical Manual page 282

6.4 Fault
Code Name
Note:
• Detected if balance is lost between the three phases of the output current from the PM motor.
• Perform Fault Reset to clear the fault.
Code Name
LSo LSo Fault
Note:
• Detected if step-out is detected while running at low speed.
• Perform Fault Reset to clear the fault.
• LSo is a protective function which stops the motor to discontinue reverse running if a motor without a motor code mistakenly detects
the initial polarity. To detect motor reversal quickly, lower the values set in L8-93 to L8-95 to a range in which the drive does not
malfunction.
Code Name
nSE Node Setup Error
Note:
Perform Fault Reset to clear the fault.
Code Name
oC Overcurrent
282
Cause
The drive output circuit is broken.
Cause
The motor code is not set correctly.
The load is too heavy.
An external force on the load side
caused the motor to move at start.
The drive incorrectly detected the motor
magnetic pole position.
Values set in parameters L8-93 [LSo
Detection Time at Low Speed], L8-94
[LSo Detection Level at Low Speed],
and L8-95 [Average LSo Freq at Low
Speed] are incorrect.
Cause
The terminal to which H1-xx = 47
[Node Setup] was set was triggered
during run.
The Run command was input while the
Node Setup function was active.
Cause
The load is too heavy.
The motor is damaged from overheat or
the motor insulation is deteriorated.
The contact with a damaged motor main
circuit cable is creating a short circuit.
The output transistor of the drive has
been damaged due to a short circuit or
ground fault on the drive output side.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Possible Solution
Replace the control board or the entire drive if the
fault still remains even after all counter-measures
have been taken. For more information on
replacing the control board, contact Yaskawa or
your nearest sales representative.
Possible Solution
• Set E5-01 [PM Motor Code Selection] correctly
based on the motor being used.
• For specialized motors, refer to the motor's test
report and set E5-xx correctly.
• Reduce the load.
• Replace the drive and motor with a larger model.
Identify and fix any problems on the load side
causing the motor to rotate from the load side.
• Set b3-01 = 1 [Speed Search Selection at Start =
Enabled].
• Check U6-57 [PoleDis IdDifVal], and if the
value is lower than 819, increase the value set in
n8-84 [InitPolarityEstimationTimeoutCur].
Increase the values set in L8-93 to L8-95.
Possible Solution
Stop the drive when using the Node Setup function.
Possible Solution
• Measure the current flowing into the motor.
• Replace the drive with a larger capacity model if
the current value exceeds the drive rated current.
• If the current value changes suddenly, reduce the
load change or switch to a larger drive.
Measure the motor insulation resistance, and
replace the motor if there is electrical conduction or
worn insulation.
• Check whether the motor main circuit cable is
damaged, and remove any short circuits.
• Measure the resistance between the motor main
circuit cable and the ground terminal. If there is
electrical conduction, replace the cable.
• Make sure terminal B1 and terminals U/T1, V/
T2, and W/T3 are not shorted. Also make sure
terminal - and terminals U/T1, V/T2, and W/T3
are not shorted.
• If a short circuit has occurred, contact Yaskawa
or your nearest sales representative.