YASKAWA GA50U Series

13 Troubleshooting
YASKAWA TOEPC71061752B GA500 Drive Installation & Primary Operation 107
Code Name Causes Possible Solutions
SEr
Speed Search Retries
Exceeded
The speed search-related
parameters are set incorrectly.
• Decrease the value set in b3-10 [Speed
Estimation Detection Gain].
• Increase the value set in b3-17 [Speed
Est Retry Current Level].
• Increase the value set in b3-18 [Speed
Est Retry Detection Time].
• Do Auto-Tuning again.
The motor is coasting in the
opposite direction of the Run
command.
Set b3-14 = 1 [Bi-directional Speed Search
= Enabled].
STPo
Motor Step-Out
Detected
The motor code is set incorrectly
for PM Control Methods.
• Set E5-01 [PM Motor Code Selection]
correctly as specified by the motor.
• For specialized motors, refer to the motor
test report and set E5-xx correctly.
The load is too large. • Increase the value set in n8-55 [Motor to
Load Inertia Ratio].
• Increase the value set in n8-51 [Pull-in
Current @ Acceleration]. If the drive
detects STPo during deceleration when
increasing the value set in n8-51, set the
value of n8-79 [Pull-in Current @
Deceleration] lower than n8-51.
• Decrease the load.
• Replace the drive and motor with larger
capacity models.
The load inertia is too large. Increase the value set in n8-55.
The acceleration/deceleration
times are too short.
• Increase the values set in C1-01 to C1-08
[Acceleration/Deceleration Times].
• Increase the value set in C2-01 [S-Curve
Time @ Start of Accel].
Speed response is too slow. Increase the value set in n8-55.
TiM Keypad Time Not Set
There is a battery in the keypad,
but the date and time are not set.
Use the keypad to set the date and time.
UL3
Undertorque Detection
1
A fault occurred on the machine.
Example: There is a broken pulley
belt.
Examine the machine and remove the cause
of the fault.
The parameters are incorrect for
the load.
Adjust L6-02 [Torque Detection Level 1]
and L6-03 [Torque Detection Time 1]
settings.
UL4
Undertorque Detection
2
A fault occurred on the machine.
Example: There is a broken pulley
belt.
Examine the machine and remove the cause
of the fault.
The parameters are incorrect for
the load.
Adjust L6-05 [Torque Detection Level 2]
and L6-06 [Torque Detection Time 2]
settings.
UL5
Mechanical Weakening
Detection 2
The drive detected undertorque as
specified by the conditions for
mechanical weakening detection
set in L6-08 [Mechanical Fatigue
Detect Select].
Examine the machine for deterioration.