5 Troubleshooting
138 YASKAWA ELECTRIC TOEP C710616 38H YASKAWA AC Drive-L1000A Quick Start Guide
ov
DC Bus Overvoltage
The DC bus voltage exceeded the trip point.
For 200 V class: approximately 410 V
For 400 V class: approximately 820 V
For 600 V class drives: approximately 1040 V
PASS MEMOBUS/Modbus Communication Test Mode Complete
PGo
Encoder Disconnected (for Control Mode with Encoder)
Detected when no encoder signal is received for a time longer than setting in F1-14.
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.
<1> Terminals H1, H2, DM+, and DM- on 600 V class models are designed to the functionality, but are not certified to IEC/EN 61800-5-2, ISO/EN
13849 Cat. 3, IEC/EN 61508 SIL2, Insulation coordination: class 1.
Digital Operator Display Minor Fault Name
TOEP_C710616_38H_7_0.book 138 ページ ２０１５年１１月１１日 水曜日 午後７時４０分
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