Cause Possible Solutions
Minor Fault
Output
(H2-oo =
10)
A digital input programmed to 67H
(MEMOBUS/Modbus test) was closed
while the drive was running.
Stop the drive and run the test again. No output
LED Operator Display Minor Fault Name
TrPC
IGBT Maintenance Time (90%)
IGBTs have reached 90% of their expected performance life.
Cause Possible Solutions
Minor Fault
Output
(H2-oo =
10)
IGBTs have reached 90% of their expected
performance life.
Replace the drive. YES
LED Operator Display Minor Fault Name
UL3
Undertorque Detection 1
Drive output current (or torque in OLV) less than L6-02 for longer than L6-03 time.
Cause Possible Solutions
Minor Fault
Output
(H2-oo =
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. YES
LED Operator Display Minor Fault Name
UL4
Undertorque Detection 2
Drive output current (or torque in OLV) less than L6-05 for longer than L6-06 time.
Cause Possible Solutions
Minor Fault
Output
(H2-oo =
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. YES
LED Operator Display Minor Fault Name
Uv
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.
• 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.
Cause Possible Solutions
Minor Fault
Output
(H2-oo =
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 specified in this manual
to fasten the terminals. Refer to
Wire Gauges and Tightening Torque on page 56
YES
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.
YES
Drive internal circuitry is worn.
• Check the maintenance time for the capacitors (U4-05).
• Replace the drive if U4-05 exceeds 90%.
YES
The drive input power transformer is not
large enough and voltage drops when the
power is switched on.
• 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.
YES
Air inside the drive is too hot. • Check the temperature inside the drive. YES
The CHARGE indicator light is broken or
disconnected.
• Replace the drive. YES
6.5 Alarm Detection
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
273
6
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