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6.5 Alarm Detection
372
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
Digital Operator Display
Minor Fault Name
UL3
Undertorque Detection 1
Drive output current (or torque in OLV, CLV, AOLV/PM, CLV/PM) less than L6-02 for longer than L6-03 time.
Cause
Possible Solutions
Minor Fault
(H2-01 = 10)
Inappropriate parameter settings.
Check parameters L6-02 and L6-03.
YES
Load has dropped or decreased significantly.
Check for broken parts in the transmission system.
Digital Operator Display
Minor Fault Name
UL4
Undertorque Detection 2
Drive output current (or torque in OLV, CLV, AOLV/PM, CLV/PM) less than L6-05 for longer than L6-06 time.
Cause
Possible Solutions
Minor Fault
(H2-01 = 10)
Inappropriate parameter settings.
Check parameters L6-05 and L6-06.
YES
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 control power supply voltage is under
L2-05.
Cause
Possible Solutions
Minor Fault
(H2-01 = 10)
Phase loss in the drive input power.
Check for wiring errors in the main circuit drive input power. Correct the wiring.
YES
Loose wiring in the drive input power terminals.
• Ensure the terminals have been properly tightened.
• Apply the tightening torque to the terminals as specified.
Refer to Main Circuit Wire Gauges and Tightening
There is a problem with the drive input power
voltage.
• Check the voltage.
• Lower the voltage of the drive input power so that it is within the limits listed in the specifications.
Drive internal circuitry is worn.
• Check the maintenance time for the capacitors (U4-05).
• Replace either the control board or the entire drive if U4-05 exceeds 90%. For instructions on replacing the
control board, 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.
SIEP_C710636_02B_1_0.book 372 ページ 2015年11月25日 水曜日 午後4時56分