YASKAWA CIMR-VU BA0001 Technical Manual page 279

Digital Operator Display
Excessive braking inertia.
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 trips 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 and circuit fault
Digital Operator Display
Cause
Speed Search parameters are set to the wrong
values.
The motor is coasting in the opposite direction
of the Run command.
Digital Operator Display
Cause
The wrong motor code has been set (Yaskawa
motors only).
Load is too heavy.
Load inertia is too heavy.
Acceleration and deceleration times are too
short.
Digital Operator Display
Cause
Parameter settings are not appropriate for the
type of load.
There is a fault on the machine side.
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
Recalculate braking load and braking power. Then try reducing the braking load and checking the braking
resistor settings and improve braking capacity.
• 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 if the fault reoccurs.
on page 298.
• Replace the drive if the fault continues.
SC IGBT Short Circuit
• Check motor wiring
• Cycle power to the drive.
• If the problem continues, contact your Yaskawa representative or the nearest Yaskawa sales office.
Too Many Speed Search Restarts
SEr
The number of speed search restarts exceeded the number 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.
Motor Pull Out or Step Out Detection
STo
Motor pull out or step out has occurred. Motor has exceeded its pull out torque.
• Enter the correct motor code for the PM being used into E5-01.
• For special-purpose motors, enter the correct data to all E5 parameters according to the Test Report
provided for the motor.
• Increase the value set to n8-55 (Load Inertia for PM).
• Increase the value set to n8-51 (Pull-In Current during Accel/Decel for PM).
• Reduce the load.
• Increase the motor or drive capacity.
Increase n8-55 (Load Inertia for PM).
• Increase the acceleration and deceleration times (C1-01 through C1-08).
• Increase the S-curve acceleration and deceleration times (C2-01).
Undertorque Detection 1
UL3
The current has fallen below the minimum value set for torque detection (L6-02) for longer than the
allowable time (L6-03).
Check the settings of parameters L6-02 and L6-03.
Check the load for any problems.
Fault Name
Fault Name
Possible Solution
Refer to Diagnosing and Resetting Faults
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
6.4 Fault Detection
6
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