YASKAWA V1000 Quick Start Manual page 94

5.2 Fault Detection
Cause
The main circuit capacitors are
worn.
Cause
Deceleration time is too short and
excessive regenerative energy is
flowing back into the drive.
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.
Cause
The braking transistor is damaged.
The control circuit is damaged.
There is a fault on the machine side. Check the load for any problems.
94
• Check the maintenance time for the capacitors (U4-05).
• Replace the drive if U4-05 is greater than 90%.
• Check for anything wrong with the drive input power.
• If nothing is wrong with the drive input power, try the following solutions if
the alarm continues:
• Disable Input Phase Loss Protection selection (L8-05 = "0"). PF is detected if
DC bus ripple is too high. If it is disabled, there is no fault but the ripple is still
too high, thereby the capacitors are stressed more and lose lifetime.
• Replace the drive.
PG Disconnect (for Simple V/f with PG)
PGo
No PG pulses are received for longer than the time set to F1-14.
Braking Resistor Overheat
rH
Braking resistor protection was triggered.
Fault detection is enabled when L8-01 = 1 (disabled as a default).
• 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.
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.
and Resetting Faults on page
• Replace the drive if the fault continues.
Too Many Speed Search Restarts
SEr
The number of speed search restarts exceeded the number set to b3-19.
Pull-Out Detection
STO
Motor pull-out has occurred.
Undervoltage 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).
YASKAWA ELECTRIC TOEP C710606 14A YASKAWA AC Drive - V1000 Quick Start Guide
Possible Solution
Possible Solution
Possible Solution
103.
Refer to Diagnosing