YASKAWA
TOEPC71061782C GA800 Drive Installation & Primary Operation
93
Code
Name
Causes
Possible Solutions
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
Com Error / Abnormal SD card
There is not a micro SD in the keypad.
Put a micro SD card in the keypad.
•
The drive is connected to USB.
•
The number of log communication files is more
than 1000.
•
The micro SD card does not have available
memory space.
•
The line number data in a log communication file
is not correct.
•
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.
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 the
L8-02 [Overheat Alarm
Level]
.
•
Measure the ambient temperature.
•
Increase the airflow around the drive.
•
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.
oH2
External Overheat (H1-XX=B)
An external device sent an
oH2
.
1.
Find the external device that output the overheat alarm.
2.
Remove the cause of the problem.
3.
Clear the
Overheat Alarm (oH2) [H1-xx = B]
that was set to
MFDI terminals S1 to S6.
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
Mechanical Weakening Detection 1
The drive detected overtorque as specified by the
conditions for mechanical weakening detection set in
L6-08 [Mechanical Fatigue Detect Select]
.
Do a deterioration diagnostic test on the machine side.
oS
Overspeed
There is overshoot.
•
Decrease
C5-01 [ASR Proportional Gain 1]
and increase
C5-02
[ASR Integral Time 1]
.
•
Use
H6-02 to H6-05 [Pulse Train Input Setting Parameters]
to
adjust the pulse train gain.
ov
Overvoltage
There are surge voltages in the input power supply.
Connect a DC link choke to the drive.
Note:
If you turn the phase advancing capacitors ON and OFF and use
thyristor converters in the same power supply system, there can
be surge voltages that irregularly increase the input voltage.
The drive output cable or motor is shorted to ground.
(The current short to ground is charging the main
circuit capacitor of the drive through the power
supply.)
1.
Examine the motor main circuit cable, terminals, and motor
terminal box, and then remove ground faults.
2.
Re-energize the drive.
The power supply voltage is too high.
Decrease the power supply voltage to match the drive rated voltage.
Electrical interference caused a drive malfunction.
•
Examine the control circuit lines, main circuit lines, and ground
wiring, and decrease the effects of electrical interference.
•
Make sure that a magnetic contactor is not the source of the
electrical interference, then use a Surge Protective Device if
necessary.
•
Set
L5-01 ≠ 0 [Number of Auto-Restart Attempts ≠ 0 times]
.
