Yaskawa 600V - Manual (Page 49)

HOA Keypad ALM FLT Cause Possible Solution
Overvoltage
ov
O O
Deceleration time is too short and regenerative
energy is flowing from the motor into the drive
• Increase the deceleration time (C1-02 and C1-04).
• Install a dynamic braking resistor or a dynamic braking
resistor unit.
• Set L3-04 to 1 to enable stall prevention during deceleration.
Stall Prevention is enabled as the default setting.
Fast acceleration time causes the motor to
overshoot the speed reference
• Check if sudden drive acceleration triggers an overvoltage
alarm.
• Increase the acceleration time.
• Use longer S-curve acceleration and deceleration times.
• Enable the Overvoltage Suppression function (L3-11 = 1).
• Lengthen the S-curve at acceleration end.
Excessive braking load
The braking torque was too high, causing regenerative energy
to charge the DC bus. Reduce the braking torque, use a dynamic
braking option, or lengthen decel time.
MEMOBUS/Modbus
Comm. Test Mode
Complete
PASS
O MEMOBUS/Modbus test has finished normally This verifies that the test was successful.
Input Phase Loss
PF
O
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 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.
Too Many Speed
Search Restarts
SEr
O
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).
• Repeat Auto-Tuning.
The motor is coasting in the opposite direction of
the Run command
Set b3-14 to 1 to enable Bi-Directional Speed Search.
Time Data Error
TdE
O
An error has occurred in the Real-Time Clock
function of the HOA keypad
Replace the HOA keypad. For replacement instructions,
contact Yaskawa or your nearest sales representative.
Time Not Set
TIM
O O
The Real-Time Clock for the HOA keypad is not
set in parameter o4-17
Set o4-17 to 1 to set the time for the HOA keypad.
The drive will display the "TIM" alarm (Time Not Set) when
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.
Undertorque
Detection 1
UL3
O O
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.
Motor Underload
UL6
O O
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.
Undervoltage
Uv
O
There is a problem with the drive input power
voltage
• Check the voltage.
• Lower the voltage of the drive input power so that it is within
the limits listed in the specifications.
Phase loss in the drive input power.
Check for wiring errors in the main circuit drive input power.
Correct the wiring.
Drive internal circuitry is worn.
• Check the maintenance time for the capacitors (U4-05).
• Replace either the control board or the entire drive if U4-05
exceeds 90%. For instructions on replacing the control
board, contact Yaskawa or your nearest sales representative.
i.8 Troubleshooting
YASKAWA ELECTRIC TOEP YAIZ1U 02A YASKAWA AC Drive – Z1000 Safety Precautions 49