YASKAWA V1000 Quick Start Manual page 144

5.2 Fault Detection
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.
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.
The wiring for the control power
supply is damaged.
Internal circuitry is damaged.
Cause
144
Mechanical Weakening Detection 2
UL5
The operation conditions matched the conditions set to L6-08.
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 (L2-05).
Uv1
• 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 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.
for details.
• 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.
Control Power Supply Voltage Fault
Uv2
Voltage is too low for the control drive input power.
Correct parameter L2-02 setting or install optional Momentary Power Loss Ride-
Thru unit.
• Cycle power to the drive. Check if the fault reoccurs.
• Replace the drive if the fault continues to occur.
• Cycle power to the drive. Check if the fault reoccurs.
• Replace the drive if the fault continues to occur.
Undervoltage 3 (Inrush Prevention Circuit Fault)
Uv3
The inrush prevention circuit has failed.
YASKAWA ELECTRIC TOEP C710606 47A YASKAWA AC Drive – V1000 Quick Start Guide
Possible Solution
Possible Solution
Possible Solution