YASKAWA GA700 Series

7.5 Minor Faults/Alarms
358 YASKAWA SIEPC71061705H GA700 Series Technical Manual
Code Name Causes Possible Solutions
SToF Safe Torque OFF
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 terminals H1-HC or 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 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
You put a battery in the keypad, but you have not
set the date and time.
Set the date and time with the keypad.
Note:
• Parameter o4-24 [bAT Detection Selection] enables and disables TiM detection.
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
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. Contact Yaskawa or your nearest
sales representative for more information.
Note:
If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
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].
Code Name Causes Possible Solutions
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.
Note:
• 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 L6-08.
Code Name Causes Possible Solutions
Uv Undervoltage
The drive input power voltage is changing too
much.
• Examine the input power for problems.
• Make the drive input power stable.
• If the input power supply is good, examine the magnetic
contactor on the main circuit side for problems.
There is a phase loss 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.
Tighten the terminal screws to the correct tightening torque.
There was a loss of power. Use a better power supply.
The main circuit capacitors have become
unserviceable.
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.
The drive input power transformer is too small and
voltage drops when the power is switched on.
• Check for an alarm when a molded-case circuit breaker,
Leakage Breaker (ELCB, GFCI, or RCM/RCD) (with
overcurrent protective function), or magnetic contactor is ON.
• Check the capacity of the drive power supply transformer.
Air inside the drive is too hot. Check the ambient temperature of the drive.