YASKAWA V1000

PGo
PG Disconnect (for Simple V/f with PG)
No PG pulses are received for longer than the time set to F1-14.
rH
Braking Resistor Overheat
Braking resistor protection was triggered.
Fault detection is enabled when L8-01 = 1 (disabled as a default).
Cause Possible Solution
Deceleration time is too short and
excessive regenerative energy is
flowing back into the drive.
• Check the load, deceleration time and speed.
• Reduce the load.
• Increase the acceleration and deceleration times (C1-01 through C1-08).
• Replace the braking option with a larger device that can handle the power that
is discharged.
Excessive braking inertia.
Recalculate braking load and braking power. Then try reducing the braking load
and checking the braking resistor settings and improve braking capacity.
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 trips the alarm even when the braking resistor surface is not very
hot.
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 if the fault reoccurs. Refer to Diagnosing
and Resetting Faults on page 153.
• Replace the drive if the fault continues.
The control circuit is damaged.
SC IGBT Short Circuit
IGBT fault • Check motor wiring
• Cycle power to the drive.
• If the problem continues, contact your Yaskawa representative or the nearest
Yaskawa sales office.
IGBT short circuit detection and
circuit fault
SEr
Too Many Speed Search Restarts
The number of speed search restarts exceeded the number set to b3-19.
STo
Motor Pull Out or Step Out Detection
Motor pull out or step out has occurred. Motor has exceeded its pull out torque.
UL3
Undertorque Detection 1
The current has fallen below the minimum value set for torque detection (L6-02)
for longer than the allowable time (L6-03).
There is a fault on the machine side. Check the load for any problems.
UL4
Undertorque Detection 2
The current has fallen below the minimum value set for torque detection (L6-05)
for longer than the allowable time (L6-06).
5.2 Fault Detection
YASKAWA ELECTRIC TOEP C710606 47A YASKAWA AC Drive – V1000 Quick Start Guide
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Troubleshooting