YASKAWA
TOEPC7106170YB YASKAWA AC Drive GA500 Installation & Primary Operation
153
Code
Name
Causes
Possible Solutions
TrPC
IGBT Maintenance
Time (90%)
The IGBT is at 90% of its
expected performance life.
Replace the IGBT or the drive. For
information about replacing the control
board, contact Yaskawa or your nearest
sales representative.
UL3
Undertorque
Detection 1
A fault occurred on the
machine.
Example: There is a broken
pulley belt.
Examine the machine and remove the
cause of the fault
The parameters are incorrect for
the load.
Adjust
L6-02 [Torque Detection Level 1]
and
L6-03 [Torque Detection Time 1]
.
UL4
Undertorque
Detection 2
A fault occurred on the
machine.
Example: There is a broken
pulley belt.
Examine the machine and remove the
cause of the fault
The parameters are incorrect for
the load.
Adjust
L6-05 [Torque Detection Level 2]
and
L6-06 [Torque Detection Time 2]
.
UL5
Mechanical
Weakening Detection
2
The drive detected undertorque
as specified by the conditions
for mechanical weakening
detection set in
L6-08
[Mechanical Fatigue Detect
Select]
.
Examine the machine for deterioration.
Uv
DC Bus Undervoltage
The drive input power voltage is
changing too much.
•
Use a better power supply voltage to
align with the drive rated voltage.
•
Make the drive input power stable.
•
If there is not a fault with the input
power supply, examine the magnetic
contactor on the main circuit side for
faults.
A phase loss occurred in the
drive input power.
Correct errors with the wiring for main
circuit drive input power.
There is loose wiring in the
drive input power terminals.
Examine for loose screws and tighten
them as specified by the tightening
torque values in the manual.
There was a loss of power.
Use a better power supply.
The main circuit capacitors have
deteriorated.
Examine the capacitor maintenance time
in monitor
U4-05
[CapacitorMaintenance]
. If
U4-05
is
more than 90%, replace the control board
or the drive. For information about
replacing the control board, contact
Yaskawa or your nearest sales
representative.