YASKAWA CIMR-VU BA0001 Technical Manual page 280

6.4 Fault Detection
Digital Operator Display
Cause
Parameter settings are not appropriate for the
type of load.
There is a fault on the machine side.
Digital Operator Display
Cause
Undertorque was detected and matched the
condition of mechanical loss detection
operation selection (L6-08).
Digital Operator Display
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.
Digital Operator Display
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.
Digital Operator Display
Cause
280
Undertorque Detection 2
UL4
The current has fallen below the minimum value set for torque detection (L6-05) for longer than the
allowable time (L6-06).
Check the settings of parameters L6-05 and L6-06.
Check the load for any problems.
Mechanical Weakening Detection 2
UL5
The operation conditions matched the conditions set to L6-08.
Check the load side for any problems.
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.
and Tightening Torques on page 58
• 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.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
for details.
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
Refer to Wire Gauges