YASKAWA iQpump Micro CIMR-PW Series User Manual page 266

6.3 Fault Detection
LED Display LCD Display
The output current has fallen below the motor
underload curve defined in L6-14 for longer
than the time set to L6-03
LED Display LCD Display
vu1
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
LED Display LCD Display
vu2
Cause
L2-02 changed from its default value in drive
that is 7.5 kW or smaller without installing a
Momentary Power Loss Ride-Thru.
Control power supply wiring is damaged
Internal circuitry is damaged
LED Display LCD Display
vu3
Cause
The relay or contactor on the soft-charge
bypass circuit is damaged
LED Display LCD Display
ult5
Cause
266
Adjust the value set to L6-14 so that output current remains above the motor underload curve during normal
operation.
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: approximately 190 V (160 V for single phase drives)
Uv1
• 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 is under L2-05 for longer than L2-02.
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.
Tightening Torques on page 50
• 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 the drive if U4-05 exceeds 90%.
• Cycle power to the drive and see if the fault reoccurs.
• If the problem continues, replace the drive.
• Check monitor U4-06 for the performance life of the soft-charge bypass.
• Replace the drive if U4-06 exceeds 90%.
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. For
instructions on replacing the control board, contact Yaskawa or a Yaskawa representative.
• Cycle power to the drive. Check if the fault reoccurs.
• If the problem continues, replace the drive.
Undervoltage 3 (Soft-Charge Bypass Circuit Fault)
Uv3
The soft-charge bypass circuit failed.
• Cycle power to the drive and see if the fault reoccurs.
• If the problem continues, replace the drive.
• Check monitor U4-06 for the performance life of the soft-charge bypass.
• Replace the drive if U4-06 exceeds 90%.
Volute-Thermostat Fault
VLTS
Fault Name
Fault Name
Possible Solution
for details.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA TOEP YAIQPM 03B YASKAWA AC Drive - iQpump Micro User Manual
Refer to Wire Gauges and