YASKAWA CIMR-JC4A0002BAA Quick Start Manual page 140

The proper braking resistor has not
been installed.
LED Operator 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.
Drive internal circuitry has become
worn.
The drive input power transformer
is not large enough and voltage
drops after switching on power.
Air inside the drive is too hot.
Problem with the CHARGE
indicator.
LED Operator Display
Uv3
Cause
The contactor on the inrush
prevention circuit is damaged.
YASKAWA ELECTRIC TOEP C710606 26B YASKAWA AC Drive – J1000 Quick Start Guide
• Check the specifications and conditions for the braking resistor device.
• Select the optimal braking resistor.
DC Bus Undervoltage
One of the following conditions occurred while the drive was in operation:
• Voltage in the DC bus fell below the undervoltage detection level.
• 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 the DC bus voltage is below the Uv
detection level for a certain time while L2-01 = 1.
• 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.
Refer to Wire Gauges and Tightening Torque on page 46
• Check the voltage.
• Correct the voltage to within range listed in drive input power specifications.
Correct the drive input power.
• Check the maintenance time for the capacitors (U4-05).
• Replace the drive if U4-05 exceeds 90%.
Check the capacity of the drive input power transformer.
Check the drive internal temperature.
Replace the drive.
Undervoltage 3 (Inrush Prevention Circuit Fault)
The inrush prevention circuit has failed.
• Cycle power to the drive. Check if the fault reoccurs.
• Replace the drive if the fault continues to occur.
• Check monitor U4-06 for the performance life of the inrush prevention circuit.
• Replace the drive if U4-06 exceeds 90%.
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5.4 Fault Detection
Fault Name
Possible Solution
Fault Name
Possible Solution
5
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