YASKAWA GA700 Series Technical Manual page 331

Code Name
LF2 Output Current Imbalance
Note:
• The drive detects this fault if there is not balance between the three phases of the output current from the PM motor.
• Do a Fault Reset to clear the fault.
Code Name
LSo Low Speed Motor Step-Out
Note:
• The drive detects this fault if it detects step-out while running at low speed.
• Do a Fault Reset to clear the fault.
• LSo is a protective function that stops the motor and stops the reverse run if a motor without a motor code incorrectly detects the initial polarity. To quickly detect motor
reversal, decrease 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:
Do a Fault Reset to clear the fault.
Code Name
oC Overcurrent
YASKAWA SIEPC71061705H GA700 Series Technical Manual
Causes
Phase loss occurred in the wiring on the output side
of the drive.
The output terminal screws of the drive are loose.
There is not balance between the three phases of the
PM motor impedance.
The drive output circuit is broken.
Causes
The motor code set incorrectly.
The load is too large.
An external force on the load side caused the motor
to move at start.
The drive incorrectly detected the motor magnetic
pole position.
The setting of n8-84 [Polarity Detection Current] is
too low.
Incorrect values set in L8-93 [Low Speed Pull-out
DetectionTime], L8-94 [Low Speed Pull-out Detect
Level], and L8-95 [Low Speed Pull-out Amount].
The drive incorrectly detected the motor magnetic
pole position.
Causes
The H1-xx = 47 [Node Setup (CANopen)] terminal
was activated during run.
The drive received a Run command while the Node
Setup function was active.
Causes
The load is too heavy.
Overheating caused damage to the motor or the
motor insulation is not satisfactory.
The motor main circuit cable is contacting ground
to make a short circuit.
A short circuit or ground fault on the drive output
side caused damage to the output transistor of the
drive.
Possible Solutions
Examine for wiring errors or disconnected wires on the output
side of the drive, and repair problems.
Tighten the terminal screws to the correct tightening torque.
• Measure the Line-to-Line Resistance for each motor phase and
make sure that resistance is equal in the three phases, and that
all wires are connected correctly.
• Replace the motor.
• Re-energize the drive.
• If the fault stays, replace the control board or the drive. For
information about replacing the control board, contact
Yaskawa or your nearest sales representative.
Possible Solutions
• Set E5-01 [PM Motor Code Selection] correctly as specified
by the motor.
• For specialized motors, refer to the motor test report and set
E5-xx correctly.
• Decrease the load.
• Replace the drive and motor with larger capacity models.
Find and repair problems on the load side that cause the motor to
rotate from the load side.
• Set b3-01 = 1 [Speed Search at Start Selection = Enabled].
• If the value for U6-57 [PolePolarityDeterVal] is lower than
819, increase the value set in n8-84 [Polarity Detection
Current]. Consult the motor manufacturer for information
about maximum setting values.
Increase the n8-84 setting from the default. Consult the motor
manufacturer for information about maximum setting values.
Increase the values set in L8-93 to L8-95.
If you are using an IPM motor, do High Frequency Injection
Auto-Tuning.
Possible Solutions
Stop the drive when the Node Setup function is in use.
Possible Solutions
• Measure the current flowing into the motor.
• Replace the drive with a larger capacity model if the current
value is more than the drive rated current.
• Decrease the load or replace with a larger drive to prevent
sudden changes in the current level.
Measure the motor insulation resistance, and replace the motor if
there is electrical conduction or unserviceable insulation.
• Examine the motor main circuit cable for damage, and repair
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 that there is not a short circuit in terminal B1 and
terminals U/T1, V/T2, and W/T3. Make sure that there is not a
short circuit in terminals - and terminals U/T1, V/T2, and W/
T3.
• If there is a short circuit, contact Yaskawa or your nearest sales
representative.
7.4 Fault
7
331