YASKAWA V1000 Technical Manual page 273

Cause
A digital input programmed to 67H
(MEMOBUS/Modbus test) was closed
while the drive was running.
LED Operator Display
TrPC
Cause
IGBTs have reached 90% of their expected
performance life.
LED Operator Display
UL3
Cause
Inappropriate parameter settings.
Load has dropped or decreased
significantly.
LED Operator Display
UL4
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.
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
Stop the drive and run the test again.
IGBT Maintenance Time (90%)
IGBTs have reached 90% of their expected performance life.
Replace the drive.
Undertorque Detection 1
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
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 56
• 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.
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
6.5 Alarm Detection
Minor Fault
Output
(H2-oo =
10)
No output
Minor Fault
Output
(H2-oo =
10)
YES
Minor Fault
Output
(H2-oo =
10)
YES
YES
Minor Fault
Output
(H2-oo =
10)
YES
YES
Minor Fault
Output
(H2-oo =
10)
YES
YES
Refer to
YES
YES
YES
YES
YES
273
6