YASKAWA CR700

13 Troubleshooting
66 YASKAWA TOEPC71061723A YASKAWA AC Drive CR700 Quick Start Guide
Code Name Causes Possible Solutions
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.
• If drive input power is correct and the fault stays, replace the
control board or the drive. For information about replacing the
control board, contact Yaskawa or your nearest sales
representative.
PGo Encoder (PG) Feedback Loss
The encoder cable is disconnected or wired
incorrectly.
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
PGoH Encoder (PG) Hardware Fault
The encoder cable is disconnected. Connect any disconnected wires in the encoder cable.
rF Braking Resistor Fault
The resistance of the dynamic braking option that is
connected to the drive is too low.
Use a dynamic braking option that fits the model and duty rating
of the drive.
rH Braking Resistor Overheat
The deceleration time is too short and excessive
regenerative energy is flowing back into the drive.
• Check the load level, deceleration time, and speed.
• Decrease the load.
• Increase the values set in C1-02, C1-04, C1-06, or C1-08
[Deceleration Times].
• Use a dynamic braking option that lets you use more power.
The duty cycle is too high. Examine the duty cycle.
Note:
When L8-01 = 1 [3% ERF DB Resistor Protection =
Enabled], the maximum braking duty cycle is 3%.
The braking load is too heavy. • Calculate the braking load and braking power again, and
decrease the braking load.
• Use a braking resistor that improves braking power.
The braking resistor is not sufficient. Use the braking resistor specifications to select a sufficient
braking resistor.
rr Dynamic Braking Transistor Fault
The drive control circuit is damaged. • Re-energize the drive.
• If the fault stays, replace the control board or the drive. For
information about replacing the control board, contact
Yaskawa or your nearest sales representative.
SC Short Circuit/IGBT Failure
Overheating caused damage to the motor or the
motor insulation is not satisfactory.
Measure the motor insulation resistance, and replace the motor if
there is electrical conduction or unserviceable insulation.
SCF Safety Circuit Fault
The safety circuit is broken. Replace the control board or the drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
SE1 Brake Sequence Fault 1 (SE1)
A forward and a reverse command were input
simultaneously.
Examine the forward and reverse command sequence circuit.
SE2 Brake Sequence Fault 2 (SE2)
The motor is not connected and the current does not
flow. The break release command (BR) does not
turn ON.
Examine the motor circuit.
SE3 Brake Sequence Fault 3 (SE3)
Sequence Error of the Brake Circuit. Examine the sequence circuit of brake release check signal (BX).
SE4 Brake Sequence Fault 4 (SE4)
The break release check (BX) turns ON when the
break release command (BR) is OFF.
Examine the sequence circuit of brake release check signal (BX).
SvE Zero Servo Fault
The value set in the torque limit is too small. Adjust torque limit-related parameters L7-01 to L7-04.
TiM Keypad Time Not Set
There is a battery in the keypad, but the date and
time are not set.
Use the keypad to set the date and time.
Uv1 DC Bus Undervoltage
There is a phase loss in the drive input power. Examine for wiring errors or disconnected wires in main circuit
drive input power, and repair problems.
There is loose wiring in the drive input power
terminals.
Tighten the terminal screws to the correct tightening torque.
The drive input power voltage is changing too
much.
• Review the power supply voltage so that it matches the drive
rated voltage.
• 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 was a loss of power. Improve the 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 more information about replacing
the control board, contact Yaskawa or your nearest sales
representative.
The relay or contactor on the soft-charge bypass
relay is damaged.
Examine the soft-charge bypass relay maintenance time in
monitor U4-06 [PreChargeRelayMainte]. If U4-06 is more than
90%, replace the control board or the drive. For more information
about replacing the control board, contact Yaskawa or your
nearest sales representative.