YASKAWA U1000 - Page 391

Digital Operator Display Minor Fault Name
MEMOBUS/Modbus test has finished
normally.
This verifies that the test was successful.
Digital Operator Display Minor Fault Name
PGo
PG Disconnect (for Control Mode with PG)
Detected when no PG pulses are received for a time longer than setting in F1-14.
Cause Possible Solutions
PG cable is disconnected. Reconnect the cable.
PG cable wiring is wrong. Correct the wiring.
PG encoder does not have enough power. Make sure the correct power supply is properly connected to the PG encoder.
Brake is holding the PG. Ensure the brake releases properly
Digital Operator Display Minor Fault Name
PGoH
PG Hardware Fault (detected when using a PG-X3 option card)
PG cable has become disconnected.
Cause Possible Solutions
PG cable is disconnected. Reconnect the cable and check the setting of F1-20.
Digital Operator Display Minor Fault Name
rUn
Motor Switch during Run
A command to switch motors was entered during run.
Cause Possible Solutions
A motor switch command was entered
during run.
Change the operation pattern so that the motor switch command is entered while the drive is stopped.
Digital Operator Display Minor Fault Name
SE
MEMOBUS/Modbus Communication Test Mode Error
Note: This alarm will not trigger a multi-function output terminal that is set for alarm output
(H2-oo = 10).
Cause Possible Solutions
A digital input set to 67H (MEMOBUS/
Modbus test) was closed while the drive
was running.
Stop the drive and run the test again.
Digital Operator Display Minor Fault Name
SrC
Phase Order Detection Fault
The phase rotation direction for the input power supply changed.
Cause Possible Solution
An input power supply wiring terminal is
loose.
Investigate and correct the cause and reset the fault. Refer to Diagnosing and Resetting Faults on page
404.
The fluctuation in the voltage of the input
power supply is too large.
Digital Operator Display Minor Fault Name
UL3
Undertorque Detection 1
Drive output current (or torque in OLV, CLV, AOLV/PM, and CLV/PM) less than L6-02 for longer than
L6-03 time.
Cause Possible Solutions
Inappropriate parameter settings. Check parameters L6-02 and L6-03.
Load has dropped or decreased
significantly.
Check for broken parts in the transmission system.
Digital Operator Display Minor Fault Name
UL4
Undertorque Detection 2
Drive output current (or torque in OLV, CLV, AOLV/PM, and CLV/PM) less than L6-05 for longer than
L6-06 time.
Cause Possible Solutions
6.5 Alarm Detection
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual
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Troubleshooting