YASKAWA CR700

13 Troubleshooting
70 YASKAWA TOEPC71061723A YASKAWA AC Drive CR700 Quick Start Guide
Code Name Causes Possible Solutions
FWdL Fwd Limit (FWdL)
The terminal assigned to H1-xx = 31, 32 [MFDI
Function Select = Forward Travel Limit (N.O.),
Forward Travel Limit (N.C.)] is input, the Run
command has been disabled.
Turn OFF the Travel Limit to input the Reverse run command.
HCA High Current Alarm
The load is too heavy. • Decrease the load for applications with repetitive starts and
stops.
• Replace the drive with a larger capacity model.
The acceleration/deceleration 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 to C1-08 [Acceleration/
Deceleration Time] until you 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 and reevaluate the motor and
drive to make sure that the drive rated current is larger than the
motor rated current.
• Replace the drive with a larger capacity model.
L24v Loss of External Power 24 Supply
The voltage of the backup 24 V power supply has
decreased. The main circuit power supply is
operating correctly.
• Examine the external 24 V power supply for disconnected
wires and wiring errors and repair the problems.
• Examine the external 24 V power supply for problems.
LoG Log Com Error
There is not a micro SD in the keypad. Put a micro SD card in the keypad.
• USB connected
• The number of log communication files is more
than 1000.
• The capacity of the micro SD card has been
exceeded.
• The line number data in a log communication
file is incorrect.
• A communication error between the keypad and
drive occurred during a log communication.
Set o5-01 = 0 [Log Start/Stop Selection = OFF].
LT-1 Cooling Fan Maintenance Time
The cooling fan is at 90% of its expected
performance life.
1. Use the procedures in this manual to replace the cooling fan.
2. Set o4-03 = 0 [Fan Operation Time Setting = 0 h] to reset
the cooling fan operation time.
LT-2 Capacitor Maintenance Time
The capacitors for the main circuit and control
circuit are at 90% of expected performance life.
Replace the control board or the drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
LT-3
SoftChargeBypassRelay
MainteTime
The soft charge bypass relay is at 90% of its
expected performance life.
Replace the control board or the drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
LT-4 IGBT Maintenance Time (50%)
The IGBT is at 50% of its expected performance
life.
Check the load, carrier frequency, and output frequency.
oH Heatsink Overheat
The ambient temperature is high and the heatsink
temperature is more than L8-02 [Overheat Alarm
Level].
• Measure the ambient temperature.
• Increase the airflow in the control panel.
• Install a cooling device (cooling fan or air conditioner) to
lower the ambient temperature.
• Remove objects near the drive that are producing too much
heat.
There is not sufficient airflow around the drive. • Give the drive the correct installation space as shown in the
manual.
• Make sure that there is sufficient circulation around the control
panel.
• Examine the drive for dust or other unwanted materials that
could clog the cooling fan.
• Remove unwanted materials that prevent air circulation.
The internal cooling fan or fans have stopped. 1. Use the procedures in this manual to replace the cooling fan.
2. Set o4-03 = 0 [CoolingFan OperationTime Setting = 0 h] to
reset the cooling fan operation time.
oH2 External Overheat (H1-XX=B)
oH2 [External Overheat (H1-XX=B)] signal was
input from an external device.
1. Identify the external device that output the overheat alarm
and remove the cause of the problem.
2. Clear the Overheat Alarm (oH2) [H1-xx = B] that was set to
MFDI terminals S1 to S10.
oH3 Motor Overheat (PTC Input)
The thermistor wiring that detects motor
temperature is defective.
Correct wiring errors.
oL3 Overtorque 1
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the fault.
oL4 Overtorque 2
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the fault.
oL5 Overload Detection (oL5)
A fault occurred on the machine.
Example: Overload occurred.
Examine the machine and remove the cause of the fault.
oL6 Light-load Accel 2 Fault (oL6)
The setting for hold level and fault detection level
of Light-load 2 functions are not appropriate.
Adjust S4-10 [L-L 2 Motoring Hold Level], S4-12 [L-L 2 Regen
Hold Level], and S4-15 [L-L 2 Fault Detection Level] settings.