HOA Keypad Display Fault Name
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 Gauges and Tightening
Torque on page 83 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 load inertia for PM motor (n8-55).
• Increase the pull-in current during accel/decel (n8-51).
• Reduce the load.
• Increase the motor or drive capacity.
Load inertia is too heavy Increase the load inertia for PM motor (n8-55).
Acceleration and deceleration times are too short
• Increase the acceleration and deceleration times (C1-01 to C1-04).
• Increase the S-curve acceleration and deceleration times (C2-01).
Speed response is too slow Increase the load inertia for PM motor (n8-55).
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 Real-Time Clock for the HOA keypad is not
set in parameter o4-17
• The drive is a new drive, first power-up
condition
• o4-17 was set to (2: Reset), by the user, manually
clearing the Real-Time Clock data.
Set the time for the HOA keypad. Parameter o4-17 = 1.
• For drive software PRG: 1012 and earlier, the drive will display the "TIM" alarm (Time Not Set)
whenever the Real time Clock is not set.
• For drive software PRG: 1013 and later, the drive will display the "TIM" alarm (Time Not Set)
whenever the Real time Clock is not set . Additionally, at power up, if the "TIM" condition is
present, the drive will automatically switch to the time setting screen (o4-17 = 1) for 30 seconds
to prompt the user to set the Real-Time Clock.
The user did not set the Real Time Clock when
prompted following power-up.
Cycle power to the drive and set the Real Time Clock within 30 seconds of power-up, or set the clock
manually via parameter o4-17.
5.4 Fault Detection
YASKAWA ELECTRIC TOEP C710616 45F YASKAWA AC Drive – Z1000 User Manual
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5
Troubleshooting
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