6.5 Minor Faults/Alarms
372 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Code Name Causes Possible Solutions
STo Safe Torque OFF Safe Disable inputs H1-HC and H2-HC
are open.
• Make sure that the Safe Disable signal is input
from an external source to terminal H1-HC and
H2-HC.
• When the Safe Disable function is not in use,
connect terminals H1-HC and H2-HC.
There is internal damage to the two Safe
Disable channels.
Replace the control board or the drive. For
information about replacing the control board,
contact Yaskawa or your nearest sales
representative.
Note:
If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
Code Name Causes Possible Solutions
SToF Safe Torque OFF Hardware One of the two terminals H1-HC or H2-
HC received the Safe Disable input
signal.
The Safe Disable input signal is wired
incorrectly.
• Make sure that the Safe Disable signal is input
from an external source to terminal H1-HC and
H2-HC.
• When the Safe Disable function is not in use,
connect terminals H1-HC and H2-HC.
There is internal damage to one Safe
Disable channel.
Replace the control board or the drive. For
information about replacing the control board,
contact Yaskawa or your nearest sales
representative.
Note:
If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
Code Name Causes Possible Solutions
TiM Keypad Time Not Set There is a battery in the keypad, but the
date and time are not set.
Set the date and time with the keypad.
Note:
• o4-24 [bAT Detection selection] enables and disables TiM detection.
• If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
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.
Note:
If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
Code Name Causes Possible Solutions
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] settings.
Note:
• The drive detects this error if the drive output current is less than the level set in L6-02 for longer than L6-03.
• If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
• If the drive detects this error, it will operate the motor as specified by the Stopping Method set in L6-01 [Torque Detection Selection
1].
Code Name Causes Possible Solutions
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] settings.
Note:
• The drive detects this error if the drive output current is less than the level set in L6-05 for longer than L6-06.
• If detected, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
• If the drive detects this error, it will operate the motor as specified by the Stopping Method set in L6-04 [Torque Detection Selection
2].
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