YASKAWA iQpump1000 User Manual page 268

5.2 Fault Detection
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
HOA Keypad Display
UnbC
<1>
Cause
The internal current sensor has detected a
current unbalance situation.
<1> Detected in models 4A0930 and 4A1200.
HOA Keypad Display
Uv1
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
HOA Keypad Display
Uv2
Cause
In drive models 2A0004 to 2A0056 or
4A0002 to 4A0031, L2-02 was changed
from its default value without installing a
Momentary Power Loss Ride-Thru unit
Control power supply wiring is damaged
268
Motor Underload
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.
Current Unbalance
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).
• For 200 V class drives: approximately 190 V
• For 400 V class drives: approximately 380 V (350 V when E1-01 is less than 400)
• For 600 V class drives: approximately 475 V
The fault is output only if L2-01 is set to 0 or 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.
Gauges and Tightening Torques on page 110
• 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 a Yaskawa 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 a Yaskawa 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 a Yaskawa representative.
Control Power Supply Voltage Fault
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. For
instructions on replacing the control board, contact Yaskawa or a Yaskawa representative.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
for details.
Fault Name
Possible Solution
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
Refer to Main Circuit Wire