6.3 Fault Detection
296 YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
Digital Operator Display Fault Name
PGo
Encoder Disconnected (for Control Mode with Encoder)
No encoder pulses are received for longer than the time set to F1-14.
Cause Possible Solution
Encoder cable is disconnected. Reconnect the cable.
Encoder cable wiring is wrong. Correct the wiring.
Encoder has no power. Check the power line to the encoder.
Motor brake is not released. Ensure the motor brake releases properly.
During Rescue Operation, either the DC bus voltage
dropped below S4-12 × (S4-13 - 10%), or 100 ms after
triggering Rescue Operation, the DC bus voltage did not
reach S4-12 × S4-13 before the motor started.
• Check the DC bus voltage setting for Rescue Operation (S4-12).
• Lower the speed reference set for Rescue Operation (S4-15).
• Check the backup power supply. It may need to be replaced with another UPS if it has become worn and can no longer provide
enough power.
Digital Operator Display Fault Name
PGoH
Encoder Disconnected (detected when using an encoder)
Encoder cable is not connected properly.
Cause Possible Solution
Encoder cable is disconnected. Reconnect the cable.
Digital Operator Display Fault Name
rF
Braking Resistor Fault
The resistance of the braking resistor being used is too low.
Cause Possible Solution
The proper braking resistor option has not been
installed.
Select the braking resistor option so that fits to the drives braking transistor specification.
A regenerative converter, regenerative unit or braking
unit is being used and the +1 or +3 terminal is connected
to - terminal.
Disable the braking transistor protection selection (set L8-55 to 1).
Digital Operator Display Fault Name
rr
Dynamic Braking Transistor Fault
The built-in dynamic braking transistor failed.
Cause Possible Solution
The braking transistor is damaged. • Cycle power to the drive and check if the fault reoccurs. Refer to Diagnosing and Resetting Faults on page 314.
• Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or a
Yaskawa representative.
The control circuit is damaged.
Digital Operator Display Fault Name
SC
IGBT Short Circuit
Short Circuit or Ground Fault is detected
Cause Possible Solution
IGBT fault. • Check the wiring to the motor.
• Turn the power supply off and then on again to check operation.
If the problem continues, contact your Yaskawa representative or nearest Yaskawa sales office.
IGBT short circuit detection circuit fault.
The drive is damaged.
• Check the drive output side short circuit for broken output transistor.
B1 and U/V/W
- (negative) and U/V/W
• Contact your Yaskawa representative or nearest Yaskawa sales office.
Digital Operator Display Fault Name
<2>
SCF
Safety Circuit Fault
Safety Circuit Fault is detected.
Cause Possible Solution
The safety circuit is damaged.
If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa representative for
instructions on replacing the control board.
Digital Operator Display Fault Name
SE1
Motor Contactor Response Error
Motor contactor does not respond within the time set to S1-10 (Run Command Delay Time).
Cause Possible Solution
There is a problem with the motor contactor or auxiliary
switch.
Check the motor contactor, auxiliary switches and the wiring of the contactor feedback signal.
Digital Operator Display Fault Name
SE2
Starting Current Error
The output current was lower than 25% of the motor no-load current at start.
Cause Possible Solution
The motor contactor is open. Check the contactor for any problems.
Digital Operator Display Fault Name
SE3
Output Current Error
The output current was lower than 25% of the motor no-load current during operation.
Cause Possible Solution
The motor contactor opened. Check the contactor for any problems.
SIEP_C710616_38F_5_0.book 296 ページ ２０１５年１１月９日 月曜日 午後３時３６分
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