Yaskawa iQpump Micro Manuel d'utilisateur télécharger pdf (Page 178)

Digital Operator Display Fault Name

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.

Digital Operator Display Fault Name

Uv1

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)

• 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.

Cause Possible Solution

Input power phase loss

• The main circuit drive input power is wired incorrectly.

• Correct the wiring.

One of the drive input power wiring

terminals is loose

• Ensure there are no loose terminals.

• Apply the tightening torque specified in this manual to fasten the terminals. Refer to Wire Gauges and

Tightening Torques on page 70 for details.

There is a problem with the voltage from

the drive input power

• 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.

The power has been interrupted Correct the drive input power.

The main circuit capacitors are worn

• Check the maintenance time for the capacitors (U4-05).

• Replace the drive if U4-05 exceeds 90%.

The relay or contactor on the soft-charge

bypass circuit is damaged

• 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%.

Digital Operator Display Fault Name

Uv2

Control Power Supply Voltage Fault

Voltage is too low for the control drive input power.

Cause Possible Solution

L2-02 changed from its default value in

drive that is 7.5 kW or smaller without

installing a Momentary Power Loss Ride-

Thru.

Correct the setting to L2-02 or install an optional Momentary Power Loss Ride-Thru unit.

Control power supply wiring is damaged

• 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.

Internal circuitry is damaged

• Cycle power to the drive. Check if the fault reoccurs.

• If the problem continues, replace the drive.

Digital Operator Display Fault Name

Uv3

Undervoltage 3 (Soft-Charge Bypass Circuit Fault)

The soft-charge bypass circuit failed.

Cause Possible Solution

The relay or contactor on the soft-charge

bypass circuit is damaged

• 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%.

Digital Operator Display Fault Name

VLTS Volute-Thermostat Fault

Cause Possible Solution

5.2 Fault Detection

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Yaskawa iQpump Micro Manuel d'utilisateur Page 178

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