Digital Operator Display
Minor Fault Name
Inappropriate parameter settings.
Check parameters L6-05 and L6-06.
The load has dropped or decreased
significantly.
Check for broken parts in the transmission system.
Digital Operator Display
Minor Fault Name
Uv
Control Circuit Undervoltage
One of the following conditions occurred:
• Contactor to suppress inrush current in the drive was opened.
• Low voltage in the control drive input power. This alarm outputs only if L2-01 is not 0 and DC bus voltage
is under L2-05.
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.
Gauges and Tightening Torque on page 98
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 capacitors are worn.
• Check the maintenance time for the capacitors (U4-05).
• Replace the entire drive if U4-05 exceeds 90%. Contact Yaskawa or your nearest sales representative.
The drive input power transformer is too
small and voltage drops when the power is
switched on.
• Check for an alarm when the magnetic contactor, line breaker, and leakage breaker are closed.
• Check the capacity of the drive input power transformer.
6.5 Alarm Detection
392
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual
Summary of Contents for U1000 iQpump Drive
Page 705: ......
