YASKAWA L1000A Quick Start Manual page 140

5 Troubleshooting
Digital Operator Display
<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.
138
DC Bus Overvoltage
The DC bus voltage exceeded the trip point.
ov
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
Encoder Disconnected (for Control Mode with Encoder)
PGo
Detected when no encoder signal is received for a time longer than setting in F1-14.
Encoder Disconnected (detected when using an encoder)
PGoH
Encoder cable has become disconnected.
SE MEMOBUS/Modbus Self Test Failed
IGBT Maintenance Time (90%)
IGBTs have reached 90% of their expected performance life.
TrPC
Note: This alarm will not trigger a multi-function output terminal that is set for alarm output (H2- =
10).
Undertorque Detection 1
UL3
Drive output current (or torque in OLV, CLV, CLV/PM) less than L6-02 for longer than L6-03 time.
Undertorque Detection 2
UL4
Drive output current (or torque in OLV, CLV, CLV/PM) less than L6-05 for longer than L6-06 time.
Undervoltage
One of the following conditions was true when the drive was stopped and a Up/Down command was
entered:
Uv
• 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.
Output Voltage Detection Error
voF
There is a problem with the output voltage.
Minor Fault Name
YASKAWA ELECTRIC TOEP C710616 38H YASKAWA AC Drive-L1000A Quick Start Guide