YASKAWA T1000V Technical Manual page 262

6.5 Alarm Detection
LED Operator Display
Cause
Inappropriate parameter settings.
Load has dropped or decreased
significantly.
LED Operator Display
Cause
Inappropriate parameter settings.
The load has dropped or decreased
significantly.
LED Operator Display
Cause
Phase loss in the drive input power.
Loose wiring in the drive input power
terminals.
There is a problem with the drive input
power voltage.
Drive internal circuitry is worn.
The drive input power transformer is not
large enough and voltage drops when the
power is switched on.
Air inside the drive is too hot.
The CHARGE indicator light is broken
or disconnected.
262
Undertorque Detection 1
UL3
Drive output current (or torque in OLV) less than L6-02 for longer than L6-03 time.
Check parameters L6-02 and L6-03.
• Check for broken parts in the transmission system.
Undertorque Detection 2
UL4
Drive output current (or torque in OLV) less than L6-05 for longer than L6-06 time.
Check parameters L6-05 and L6-06.
• Check for broken parts in the transmission system.
Undervoltage
One of the following conditions was true when the drive was stopped and a run command was entered:
• DC bus voltage dropped below the level specified in L2-05.
Uv
• Contactor to suppress inrush current in the drive was open.
• 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.
Check for wiring errors in the main circuit drive input power. Correct the wiring.
• Ensure the terminals have been properly tightened.
• Apply the tightening torque specified in this manual to fasten the terminals.
Wire Gauges and Tightening Torque on page 53
• Check the voltage.
• Lower the voltage of the drive input power so that it is within the limits listed in the
specifications.
• Check the maintenance time for the capacitors (U4-05).
• Replace the drive if U4-05 exceeds 90%.
• Check for a tripped alarm when the magnetic contactor, line breaker and leakage
breaker are turned on.
• Check the capacity of the drive input power transformer.
• Check the temperature inside the drive.
• Replace the drive.
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
Minor Fault
Output
(H2- = 10)
YES
YES
Minor Fault
Output
(H2- = 10)
YES
YES
Minor Fault
Output
(H2- = 10)
YES
Refer to YES
YES
YES
YES
YES
YES