5 Troubleshooting
136 YASK AWA TOEPYAIL1E01A YASKAWA AC Drive L1000E Quick Start Guide
PGoH
Encoder Disconnected (detected when using an encoder)
Encoder cable has become disconnected.
SE MEMOBUS/Modbus Self Test Failed
TrPC
IGBT Maintenance Time (90%)
IGBTs have reached 90% of their expected performance life.
Note: This alarm will not trigger a multi-function output terminal that is set for alarm output (H2- =
10).
UL3
Undertorque Detection 1
Drive output current (or torque in OLV, CLV, CLV/PM) less than L6-02 for longer than L6-03 time.
UL4
Undertorque Detection 2
Drive output current (or torque in OLV, CLV, CLV/PM) less than L6-05 for longer than L6-06 time.
Uv
Undervoltage
One of the following conditions was true when the drive was stopped and a Up/Down command was
entered:
• DC bus voltage dropped below the level specified in L2-05.
• 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.
voF
Output Voltage Detection Error
There is a problem with the output voltage.
Digital Operator Display Minor Fault Name
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