YASKAWA Z1000 Technical Manual page 242

6.4 Fault Detection
HOA Keypad Display
SEr
Cause
Parameters related to Speed Search are set to the
wrong values
The motor is coasting in the opposite direction of
the Run command
HOA Keypad Display
STo
Cause
Load is too heavy
Acceleration and deceleration times are too short
HOA Keypad Display
TdE
Cause
An error has occurred in the Real-Clock Time
function of the HOA keypad
A communication error has occurred with the
Real-Clock Time function of the HOA keypad
HOA Keypad Display
TIM
Cause
The time for the HOA keypad has not been set
The HOA keypad battery is low or the battery has
been replaced
An error has occurred in the Real-Time Clock
function of the HOA keypad
HOA Keypad Display
UL3
Cause
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
HOA Keypad Display
UL6
Cause
The output current has fallen below the motor
underload curve defined in L6-14 for longer than
the time set to L6-03
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Too Many Speed Search Restarts
The number of Speed Search restarts exceeded the value set to 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).
Set b3-14 to 1 to enable Bi-Directional Speed Search.
Motor Pull Out or Step Out Detection
Motor pull out or step out has occurred. Motor has exceeded its pull-out torque.
• Increase the pull-in current during accel/decel (n8-51).
• Reduce the load.
• Increase the motor or drive capacity.
• Increase the acceleration and deceleration times (C1-01 and C1-02).
• Increase the S-curve acceleration and deceleration times (C2-01).
Time Data Error
Replace the HOA keypad. For instructions on replacing the HOA keypad, contact Yaskawa or your
nearest sales representative.
Time Not Set
Possible Solution
Set the time for the HOA keypad.
Replace the HOA keypad battery and set the current time.
Replace the HOA keypad. For instructions on replacing the HOA keypad, contact Yaskawa or your
nearest sales representative.
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).
Check the load for any problems.
Motor Underload
The weight of the load has fallen below the underload curve defined in L6-14.
Adjust the value set to L6-14 so that output current remains above the motor underload curve during
normal operation.
YASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual
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