YASKAWA T103 Installation & Primary Operation page 94

20 Troubleshooting
Code Name
PASS Modbus Communication Test
PF Input Phase Loss
PGo Encoder (PG) Feedback Loss
PGoH Encoder (PG) Hardware Fault
rUn Motor Switch during Run
SE Modbus Test Mode Error
STo Safe Torque OFF
SToF Safe Torque OFF
TiM Keypad Time Not Set
TrPC IGBT Maintenance Time (90%)
UL3 Undertorque Detection 1
UL4 Undertorque Detection 2
94
Causes
The drive detects ov [Overvoltage] when:
• The acceleration completes
• The deceleration starts
• The load changes suddenly
The MEMOBUS/Modbus communications test is
complete.
There is a phase loss in the drive input power.
Loose wiring in the input power terminals.
The drive input power voltage is changing too much.
Unsatisfactory balance between voltage phases.
The main circuit capacitors have become
unserviceable.
The encoder cable is disconnected or wired
incorrectly.
The encoder cable is disconnected.
The drive received a Motor 2 Selection [H1-xx = 16]
during run.
MEMOBUS/Modbus communications self-
diagnostics [H1-xx = 67] was done while the drive
was running.
Safe Disable inputs H1-HC and H2-HC are open.
There is internal damage to the two Safe Disable
channels.
One of the two terminals H1-HC or H2-HC received
the Safe Disable input signal.
The Safe Disable input signal is wired incorrectly.
There is internal damage to one Safe Disable channel.
You put a battery in the keypad, but you have not set
the date and time.
The IGBT is at 90% of its expected performance life.
A fault occurred on the machine.
Example: There is a broken pulley belt.
A fault occurred on the machine.
Example: There is a broken pulley belt.
YASKAWA TOEPC71061782C GA800 Drive Installation & Primary Operation
Possible Solutions
• Increase the value set in n2-03 [Automatic Freq Regulator Time
2] in 50 ms increments.
Note:
Make sure that you set n2-02 ≤ n2-03. When you adjust n2-03,
you must also increase the C4-06 [Motor 2 Torque Comp Delay
Time] value by same ratio.
• Increase C4-06 in 10 ms increments.
Note:
Make sure that you set C4-02 ≤ C4-06. When you adjust C4-06,
you must also increase the n2-03 value by same ratio.
The PASS display will turn off after communications test mode is
cleared.
Correct all wiring errors with the main circuit power supply.
Tighten the screws to the correct tightening torque.
• Examine the supply voltage for problems.
• Make the drive input power stable.
• Examine the supply voltage for problems.
• Make the drive input power stable.
• If the supply voltage is good, examine the magnetic contactor on
the main circuit side for problems.
• Examine the capacitor maintenance time in monitor U4-05
[CapacitorMaintenance].
• If U4-05 is more than 90%, replace the capacitor. Contact
Yaskawa or your nearest sales representative for more
information.
• Examine the supply voltage for problems.
• Re-energize the drive.
• If the alarm stays, replace the circuit board or the drive. Contact
Yaskawa or your nearest sales representative for more
information.
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
Correct any disconnected wires in the encoder cable.
Make sure that the drive receives the Motor 2 Selection while the
drive is stopped.
Stop the drive and do MEMOBUS/Modbus communications self-
diagnostics.
• 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, use a jumper to
connect terminals H1-HC and H2-HC.
Replace the board or the drive. Contact Yaskawa or your nearest
sales representative to replace the board.
• 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, use a jumper to
connect terminals H1-HC and H2-HC.
Replace the board or the drive. For information about replacing the
control board, contact Yaskawa or your nearest sales representative.
Set the date and time with the keypad.
Replace the IGBT or the drive. Contact Yaskawa or your nearest
sales representative for more information.
Examine the machine and remove the cause of the fault.
Examine the machine and remove the cause of the fault.