YASKAWA CR700

Troubleshooting
6
6.4 Fault
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual 361
Code Name Causes Possible Solutions
SE1 Brake Sequence Fault 1 (SE1)
A forward and a reverse command were input
simultaneously.
Examine the forward and reverse command sequence circuit.
Note:
• Detected if the status that a forward a reverse command were input simultaneously reaches the detection time set in S1-16 [Sequence Fault SE1 Detect Time].
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
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.
The brake release current and torque setting value is
too high.
Decrease the parameter setting values appropriately for the load.
Brake grinding occurs and it does not reach the
brake release torque.
Examine the brake torque.
Note:
• Detected if the status that there is no brake release command signal (BX) reaches the detection time set in S1-17 [Sequence Fault SE2 Detect Time].
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
SE3 Brake Sequence Fault 3 (SE3)
Sequence Error of the Brake Circuit.
The response (scan) of the Sequence circuit is slow.
Examine the sequence circuit of brake release check signal (BX).
Loose connection or disconnection of the relay,
electromagnetic contactor and brake.
Examine the relay, electromagnetic contactor and brake.
Note:
• Detected if the status that there is no brake release check signal (BX) from the sequence circuit reaches the detection time set in S1-18 [Sequence Fault SE3 Detect Time].
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
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).
Loose connection or disconnection of the relay,
electromagnetic contactor and brake.
Examine the relay, electromagnetic contactor and brake.
Note:
• Detected if the status that there is no response from the sequence circuit reaches the detection time set in S1-19 [Sequence Fault SE4 Detect Time].
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
SvE Zero Servo Fault
The value set in the torque limit is too small. Adjust torque limit-related parameters L7-01 to L7-04.
The load torque is too large. Decrease the load torque.
Noise interference along the encoder cable Isolate the encoder cable from the drive output line or a different
source of electrical interference.
Note:
• The drive detects this error if motor rotation position moves during Zero Servo.
• Do a Fault Reset to clear the fault.
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.
Use the keypad to set the date and time.
Note:
• Do a Fault Reset to clear the fault.
• Parameter o4-24 [bAT Detection Selection] enables and disables TiM detection.
Code Name Causes Possible Solutions
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.