5.5 Faults
118 YASKAWA TOEPYAIH6B01A HV600 AC Drive Narrow Bypass Installation & Startup
Code Name Causes Possible Solutions
LOAUX Low PI Aux Feedback Level
When the drive operates in AUTO Mode or HAND
Mode, PI Auxiliary Feedback is less than the level set
in YF-09 [PI Aux Control Low Lvl Detection] for the
time set in YF-10 [PI Aux Control Low Lvl Det Time]
and the drive is running.
• Increase the PI Auxiliary Feedback level to be more than YF-09.
• Set YF-09 and YF-10 correctly.
Note:
• Do a Fault Reset to clear the fault.
• Parameter YF-11 [PI Aux Control Low Level Det Sel] sets the Auto Restart function of this fault.
Code Name Causes Possible Solutions
LOP Loss of Prime
The drive used the Y1-18 [Prime Loss Detection
Method] setting and measured a pump load that is
less than the level set in Y1-19 [Prime Loss Level] for
the time set in Y1-20 [Prime Loss Time], and the
output frequency is Y1-21 [Prime Loss Activation
Freq] or more.
• Examine for a dry well, air in the system, or no water in the
system. Use preferred priming method suggested by the pump
manufacturer to restart the pump.
• When there is resistance in the pump, let the system pump water
again.
• Set Y1-18 to Y1-21 correctly.
Note:
• Do a Fault Reset to clear the fault.
• If the drive detects this fault, it will respond as specified by the setting of Y1-22 [Prime Loss Selection].
• Parameters L5-51 [Loss of Prime Fault Retry Select] and Y1-23 [Prime Loss Max Restart Time] set the Auto Restart function of this fault.
Code Name Causes Possible Solutions
NMS Setpoint Not Met
The feedback deviates from the setpoint at a level
more than Y1-15 [Maximum Setpoint Difference] for
the time set in Y1-16 [Not Maintaining Setpoint
Time].
• Examine for a blocked impeller, over cycling, or broken pipe.
• Set Y1-15 and Y1-16 correctly.
Note:
• Do a Fault Reset to clear the fault.
• If the drive detects this fault, it will respond as specified by the setting of Y1-17 [Not Maintaining Setpoint Sel].
• Parameter L5-50 [Setpoint Not Met Fault Retry Sel] sets the Auto Restart function of this fault.
Code Name Causes Possible Solutions
nSE Node Setup Error
The drive received a Run command while the Node
Setup function was active.
Stop the drive when the Node Setup function is in use.
Note:
Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
oC Overcurrent
The load is too large. • 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.
Overheating caused damage to the motor or the motor
insulation is not satisfactory.
Measure the motor insulation resistance, and replace the motor if
there is electrical conduction or unserviceable insulation.
The motor main circuit cable is contacting ground to
make a short circuit.
• 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.
A short circuit or ground fault on the drive output
side caused damage to the output transistor of the
drive.
• 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.
The acceleration time is too short. • Calculate the torque necessary during acceleration related to the
load inertia and the specified acceleration time.
• Increase the values set in C1-01 or C1-03 [Acceleration Times]
to get the necessary torque.
• Increase the values set in C2-01 to C2-04 [S-Curve
Characteristics] to get the necessary torque.
• Replace the drive with a larger capacity model.
The drive is trying to operate a specialized motor or a
motor that is larger than the maximum applicable
motor output of the drive.
• Examine the motor nameplate, the motor, and the drive to make
sure that the drive rated current is larger than the motor rated
current.
• Replace the drive with a larger capacity model.
A magnetic contactor was switched at the output. Set the operation sequence to not turn ON or OFF the magnetic
contactor while the drive is outputting voltage.
The V/f pattern settings are incorrect. • Examine the ratios between the V/f pattern frequency and
voltage. Decrease the voltage if it is too high compared to the
frequency.
• Adjust E1-04 to E1-10 [V/f Pattern Parameters].
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