YASKAWA GA700 Technical Manual page 307

Code Name
SToF Safe Torque OFF
Note:
If detected, H2-xx = 10 [MFDO Function Select = Minor Fault] will be ON.
Code Name
TrPC IGBT Maintenance Time
(90%)
Note:
If detected, H2-xx = 10 [MFDO Function Select = Minor Fault] will be ON.
Code Name
UL3 Undertorque Detection 1
Note:
• Detected if the drive output current remains below the level set in L6-02 [Torque Detection Level 1] for longer than L6-03 [Torque
Detection Time 1].
• If detected, H2-xx = 10 [MFDO Function Select = Minor Fault] will be ON.
• If detected, the drive will operate the motor according to the stop method set in L6-01 [Torque Detection Selection 1].
Code Name
UL4 Undertorque Detection 2
Note:
• Detected if the drive output current remains below the level set in L6-05 [Torque Detection Level 2] for longer than L6-06 [Torque
Detection Time 2].
• If detected, H2-xx = 10 [MFDO Function Select = Minor Fault] will be ON.
• If detected, the drive will operate the motor according to the stop method set in L6-04 [Torque Detection Selection 2].
Code Name
UL5 Mechanical Weakening
Detection 2
Note:
• If detected, H2-xx = 10 [MFDO Function Select = Minor Fault] will be ON.
• If detected, the drive will operate the motor according to the stop method set in L6-08 [Mechanical Weakening Detect Ope].
Code Name
Uv DC Bus Undervoltage
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Cause
The Safe Disable input signal was input
to terminal H1-HC or H2-HC but not
both.
The Safe Disable input signal is wired
incorrectly.
One Safe Disable channel is internally
damaged.
Cause
IGBTs have reached 90% of their
expected performance life.
Cause
A fault occurred on the machine side.
Example: The pulley belt has broken.
The parameters for load are not
appropriate.
Cause
A fault occurred on the machine side.
Example: The pulley belt has broken.
The parameters for load are not
appropriate.
Cause
Undertorque was detected based on the
conditions for mechanical weakening
detection set in L6-08 [Mechanical
Weakening Detect Ope].
Cause
Excessive fluctuation in the drive input
power voltage.
Phase loss in the drive input power.
There is loose wiring in the drive input
power terminals.
Power loss occurred.
6.5 Minor Faults/Alarms
Possible Solution
• Check whether the Safe Disable signal is input
from an external source to terminal H1-HC or
H2-HC.
• If the Safe Disable input function is not to be
used, insert wire jumpers across the terminals
H1-HC and H2-HC.
Replace the board or the entire drive. For
instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
Possible Solution
Replace the IGBT or the entire drive. For
instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
Possible Solution
Check the condition of the machine and remove the
cause of the fault.
Adjust L6-02 and L6-03.
Possible Solution
Check the condition of the machine and remove the
cause of the fault.
Adjust L6-05 and L6-06.
Possible Solution
Check whether the machine exhibits any
deterioration.
Possible Solution
• Review the possible solutions for stabilizing the
drive input power.
• Take steps to stabilize the power supply.
• Check for any problems with the magnetic
contactor on the main circuit side if no problems
are found with the power supply.
Correct any wiring errors in the main circuit drive
input power.
Properly tighten the terminals according to the
specified tightening torque.
Improve the power supply.
6
307