YASKAWA P1000 Technical Manual page 307

The duty cycle is too high
Excessive braking inertia
The braking operation duty cycle is too high Check the braking operation duty cycle. Braking resistor protection for ERF-type braking resistors
The proper braking resistor has not been
installed
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
Cause
The braking transistor is damaged
The control circuit is damaged
Digital Operator Display
Cause
IGBT fault
IGBT short circuit detection circuit fault
The drive is damaged
Digital Operator Display
Cause
Parameters related to Speed Search are set to
the wrong values
The motor is coasting in the opposite direction
of the Run command
Digital Operator Display
TdE
Cause
An error has occurred in the Real-Clock Time
function of the digital operator
Digital Operator Display
<1>
Cause
The motor thermistor is not connected
properly.
<1> Detected in models 4A0930 and 4A1200.
Digital Operator Display
TIE
Cause
YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
Check the duty cycle. Maximum of 3% duty cycle is available when L8-01 = 1.
Recalculate braking load and braking power. Reduce the braking load by adjusting braking resistor
settings.
(L8-01 = 1) allows a braking duty cycle of maximum 3%.
• Check the specifications and conditions for the braking resistor device.
• Select the optimal braking resistor.
Dynamic Braking Transistor
rr
The built-in dynamic braking transistor failed.
• 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.
SC IGBT Short Circuit or Ground 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.
• 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.
Too Many Speed Search Restarts
SEr
The number of Speed Search restarts exceeded the value set to b3-19.
• 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.
Set b3-14 to 1 to enable Bi-Directional Speed Search.
TdE Time Data Error
Replace the digital operator. For instructions on replacing the digital operator, contact Yaskawa or your
nearest sales representative.
Thermistor Disconnect
THo
The thermistor that detects motor temperature has become disconnected.
Check the thermistor wiring.
TIE Time Interval Error
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6.4 Fault Detection
6
307