The duty cycle is too high
Check the duty cycle. Maximum of 3% duty cycle is available when L8-01 = 1.
Excessive braking inertia
Recalculate braking load and braking power. Reduce the braking load by adjusting braking resistor
settings.
The braking operation duty cycle is too high Check the braking operation duty cycle. Braking resistor protection for ERF-type braking resistors
(L8-01 = 1) allows a braking duty cycle of maximum 3%.
The proper braking resistor has not been
installed
• Check the specifications and conditions for the braking resistor device.
• Select the optimal braking resistor.
Note:
The magnitude of the braking load trips the braking resistor overheat alarm, NOT the surface temperature. Using the braking resistor more
frequently than its rating permits will trip the alarm even when the braking resistor surface is not very hot.
Digital Operator Display
Fault Name
rr
Dynamic Braking Transistor
The built-in dynamic braking transistor failed.
Cause
Possible Solution
The braking transistor is damaged
• Cycle power to the drive and check for reoccurrence of the fault.
• 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 or Ground Fault
Cause
Possible Solution
IGBT fault
• Check motor wiring.
• Turn off the power supply, then turn it on. If the problem continues, contact your Yaskawa
representative or the nearest Yaskawa sales office.
IGBT short circuit detection circuit fault
The drive is damaged
• Check the drive output side short circuit for a broken output transistor
B1 and U/T1, V/T2, W/T3
– and U/T1, V/T2, W/T3
• Contact your Yaskawa representative or nearest Yaskawa sales office.
Digital Operator Display
Fault Name
SEr
Too Many Speed Search Restarts
The number of Speed Search restarts exceeded the value set to b3-19.
Cause
Possible Solution
Parameters related to Speed Search are set to
the wrong values
• Reduce the detection compensation gain during Speed Search (b3-10).
• Increase the current level when attempting Speed Search (b3-17).
• Increase the detection time during Speed Search (b3-18).
• Repeat Auto-Tuning.
The motor is coasting in the opposite direction
of the Run command
Set b3-14 to 1 to enable Bi-Directional Speed Search.
Digital Operator Display
Fault Name
TdE
TdE
Time Data Error
Cause
Possible Solution
An error has occurred in the Real-Clock Time
function of the digital operator
Replace the digital operator. For instructions on replacing the digital operator, contact Yaskawa or your
nearest sales representative.
Digital Operator Display
Fault Name
THo
Thermistor Disconnect
The thermistor that detects motor temperature has become disconnected.
Cause
Possible Solution
The motor thermistor is not connected
properly.
Check the thermistor wiring.
<1> Detected in models 4A0930 and 4A1200.
Digital Operator Display
Fault Name
TIE
TIE
Time Interval Error
Cause
Possible Solution
6.4 Fault Detection
YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
307
6
Troubleshooting
