YASKAWA V1000 Quick Start Manual page 95

UL4
UL5
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.
Uv2
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.
Uv3
YASKAWA ELECTRIC TOEP C710606 14A YASKAWA AC Drive - V1000 Quick Start Guide
Undertorque Detection 2
The current has fallen below the minimum value set for torque detection
(L6-05) for longer than the allowable time (L6-06).
Mechanical Weakening Detection 2
The operation conditions matched the conditions set to L6-08.
DC Bus Undervoltage
One of the following conditions occurred while the drive was stopped:
• 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 then 400)
The fault is output only if L2-01 = 0 or L2-01 = 1 and the DC bus voltage is
under L1-05 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.
• 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's internal temperature.
Replace the drive.
Control Power Supply Voltage Fault
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)
The inrush prevention circuit has failed.
5.2 Fault Detection
Possible Solution
Possible Solution
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