YASKAWA V1000 Series Installation & Start-Up Manual page 221

LED Operator Display
Cause
Speed Search parameters are set to
the wrong values.
The motor is coasting in the opposite
direction of the run command.
LED Operator Display
STO
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.
LED Operator Display
UL3
Cause
Parameter settings are not
appropriate for the type of load.
There is a problem with the load.
LED Operator Display
UL4
Cause
Parameter settings are not
appropriate for the type of load.
There is a problem with the load.
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07)
Too Many Speed Search Restarts
SEr
The number of speed search restarts has exceeded the number set to parameter
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.
Enable Bi-directional Speed Search (b3-14 = "1").
Pull-Out Detection
Motor pull-out has occurred.
• 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 n8-51 (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).
Undervoltage Detection 1
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.
Remove the cause of the fault.
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).
Check the settings of parameters L6-05 and L6-06.
Remove the cause of the fault.
5.5 Fault Detection
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
5
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