YASKAWA A1000 Technical Manual page 349

Digital Operator Display
<2>
Cause
The internal current sensor has detected a current
unbalance situation.
Digital Operator Display
Cause
Input power phase loss.
One of the drive input power wiring terminals is loose.
There is a problem with the voltage from the drive input
power.
The power has been interrupted.
The main circuit capacitors are worn.
The relay or contactor on the soft-charge bypass circuit
is damaged.
Digital Operator Display
Cause
For models CIMR-A2A0004 through 2A0056 and
CIMR-A4A0002 through 4A0031: L2-02 was
changed from its default value without installing a
Momentary Power Loss Ride-Thru unit.
Control power supply wiring is damaged.
Internal circuitry is damaged.
Digital Operator Display
Cause
The relay or contactor on the soft-charge bypass circuit
is damaged.
Digital Operator Display
<2>
Cause
Not enough power is being supplied to the gate drive
board.
Digital Operator Display
Cause
Hardware is damaged.
<1> Displayed as or
display will show
<2> Occurs in models CIMR-A4A0930 and 4A1200.
<3> This function prevents continuous operation in reverse when using high frequency injection (n8-57 = 1) in the Advanced Open Loop Vector
Control mode for PM motors (A1-02 = 6) with a motor for which no motor code has been entered (it does not simply prevent reverse
operation). To quickly detect undesirable reverse operation, set L8-93, L8-94, and L8-95 to low values within range of erroneous detection.
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Current Unbalance
UnbC
Current flow has become unbalanced.
• Check wiring.
• Check for damaged transistors.
• Check for short circuits or grounding problems on the connected motor.
DC Bus Undervoltage
One of the following conditions occurred while the drive was running:
• Voltage in the DC bus fell below the undervoltage detection level (L2-05)
Uv1
• For 200 V class: approximately 190 V
• For 400 V class: approximately 380 V (350 V when E1-01 is less than 400) The fault is output only if L2-01 = 0 or L2-01 = 1
and the DC bus voltage has fallen below the level set to L2-05 for longer than the time set to L2-02.
• The main circuit drive input power is wired incorrectly.
• Correct the wiring.
• Ensure there are no loose terminals.
• Apply the tightening torque specified in this manual to fasten the terminals.
page 76
• Check the voltage.
• Correct the voltage to be within the range listed in drive input power specifications.
• If there is no problem with the power supply to the main circuit, check for problems with the main circuit magnetic contactor.
Correct the drive input power.
• 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.
• Cycle power to the drive and see if the fault reoccurs.
• If the problem continues, replace either the control board or the entire drive. For instructions on replacing the control board,
contact YASKAWA or your nearest sales representative.
• Check monitor U4-06 for the performance life of the soft-charge bypass.
• Replace either the control board or the entire drive if U4-06 exceeds 90%. For instructions on replacing the control board,
contact YASKAWA or your nearest sales representative.
Control Power Supply Voltage Fault
Uv2
Voltage is too low for the control drive input power.
Correct the setting to L2-02 or install an optional Momentary Power Loss Ride-Thru unit.
• Cycle power to the drive. Check if the fault reoccurs.
• If the problem continues, replace the control board, the entire drive, or the control power supply.
• Cycle power to the drive. Check if the fault reoccurs.
• If the problem continues, replace either the control board or the entire drive. For instructions on replacing the control board,
contact YASKAWA or your nearest sales representative.
Undervoltage 3 (Soft-Charge Bypass Circuit Fault)
Uv3
The soft-charge bypass circuit has failed.
• Cycle power to the drive and see if the fault reoccurs.
• If the problem continues, replace either the control board or the entire drive. For instructions on replacing the control board,
contact YASKAWA or your nearest sales representative.
• Check monitor U4-06 for the performance life of the soft-charge bypass.
• Replace either the control board or the entire drive if U4-06 exceeds 90%. For instructions on replacing the control board,
contact YASKAWA or your nearest sales representative.
Gate Drive Board Undervoltage
Uv4
Voltage drop in the gate drive board circuit.
• Cycle power to the drive and see if the fault reoccurs.
• If the problem continues, replace either the gate drive board or the entire drive. For instructions on replacing the gate board,
contact YASKAWA or a YASKAWA representative.
Output Voltage Detection Fault
voF
Problem detected with the voltage on the output side of the drive.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact YASKAWA or your
nearest sales representative.
when occurring at drive power up. When one of the faults occurs after successfully starting the drive, the
or .
6.4 Fault Detection
Fault Name
Possible Solution
Fault Name
Possible Solution
Refer to Wire Gauges and Tightening Torque on
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Refer to Diagnosing and Resetting Faults on page
Fault Name
Possible Solution
6
366.
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