Yaskawa AC Drive Z1000 Bypass Technical Manual - Manual (Page 236)

There is phase loss in the drive input power
• Check for wiring errors in the main circuit drive input power.
• Correct the wiring.
There is loose wiring in the drive input power
terminals
• Ensure the terminals are tightened properly.
• Apply the tightening torque as specified in this manual.
Refer to Wire Gauge and Tightening
Torque Specifications on page 62 for details.
There is excessive fluctuation in the drive input
power voltage
• Check the voltage from the drive input power.
• Review the possible solutions for stabilizing the drive input power.
There is poor balance between voltage phases Stabilize drive input power or disable phase loss detection.
The main circuit capacitors are worn
• Check the maintenance time for the capacitors (U4-05).
• Replace the capacitor if U4-05 is greater than 90%. For instructions on replacing the capacitor,
contact Yaskawa or a Yaskawa representative.
Check for problems with the drive input power. If drive input power appears normal but the alarm
continues to occur, replace either the control board or the entire drive. For instructions on replacing
the control board, contact Yaskawa or a Yaskawa representative.
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.
6.4 Fault Detection
236 YASKAWA ELECTRIC SIEP YAIZ1B 01D YASKAWA AC Drive – Z1000 Bypass Technical Manual