HOA Keypad Display
Fault Name
SEr
Too Many Speed Search Restarts
The number of Speed Search restarts exceeded the value set to b3-19.
Cause
Possible Solution
Parameters related to Speed Search are set to the
wrong values
• 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).
The motor is coasting in the opposite direction of
the Run command
Set b3-14 to 1 to enable Bi-Directional Speed Search.
HOA Keypad Display
Fault Name
STo
Motor Pull Out or Step Out Detection
Motor pull out or step out has occurred. Motor has exceeded its pull-out torque.
Cause
Possible Solution
Load is too heavy
• Increase the pull-in current during accel/decel (n8-51).
• Reduce the load.
• Increase the motor or drive capacity.
Acceleration and deceleration times are too short
• Increase the acceleration and deceleration times (C1-01 and C1-02).
• Increase the S-curve acceleration and deceleration times (C2-01).
HOA Keypad Display
Fault Name
TdE
Time Data Error
Cause
Possible Solution
An error has occurred in the Real-Clock Time
function of the HOA keypad
Replace the HOA keypad. For instructions on replacing the HOA keypad, contact Yaskawa or your
nearest sales representative.
A communication error has occurred with the
Real-Clock Time function of the HOA keypad
HOA Keypad Display
Fault Name
TIM
Time Not Set
Cause
Possible Solution
The time for the HOA keypad has not been set
Set the time for the HOA keypad.
The HOA keypad battery is low or the battery has
been replaced
Replace the HOA keypad battery and set the current time.
An error has occurred in the Real-Time Clock
function of the HOA keypad
Replace the HOA keypad. For instructions on replacing the HOA keypad, contact Yaskawa or your
nearest sales representative.
HOA Keypad Display
Fault Name
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).
Cause
Possible Solution
Parameter settings are not appropriate for the load Check the settings of parameters L6-02 and L6-03.
There is a fault on the machine side
Check the load for any problems.
HOA Keypad Display
Fault Name
UL6
Motor Underload
The weight of the load has fallen below the underload curve defined in L6-14.
Cause
Possible Solution
The output current has fallen below the motor
underload curve defined in L6-14 for longer than
the time set to L6-03
Adjust the value set to L6-14 so that output current remains above the motor underload curve during
normal operation.
6.4 Fault Detection
242
YASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual
