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Digital Operator Display
Minor Fault Name
Pulse input (RP) is disconnected.
Reconnect the pulse input (RP).
YES
Pulse input (RP) wiring is wrong.
Correct the wiring.
Motor brake is engaged.
Ensure the brake releases properly
Digital Operator Display
Minor Fault Name
rUn
Motor Switch during Run
A command to switch motors was entered during run.
Cause
Possible Solution
Minor Fault
(H2-
oo
= 10)
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.
YES
Digital Operator Display
Minor Fault Name
SE
MEMOBUS/Modbus Communication Test Mode Error
Cause
Possible Solution
Minor Fault
(H2-
oo
= 10)
A digital input programmed to 67H
(MEMOBUS/Modbus test) was closed while
the drive was running.
Stop the drive and run the test again.
No output
Digital Operator Display
Minor Fault Name
TrPC
IGBT Maintenance Time (90%)
IGBTs have reached 90% of their expected performance life.
Cause
Possible Solution
Minor Fault
(H2-
oo
= 10)
IGBTs have reached 90% of their expected
performance life.
Replace the drive.
YES
Digital Operator Display
Minor Fault Name
UL3
Undertorque Detection 1
Drive output current (or torque in OLV) less than L6-02 for longer than L6-03 time.
Cause
Possible Solution
Minor Fault
(H2-
oo
= 10)
Inappropriate parameter settings.
Check parameters L6-02 and L6-03.
YES
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) less than L6-05 for longer than L6-06 time.
Cause
Possible Solution
Minor Fault
(H2-
oo
= 10)
Inappropriate parameter settings.
Check parameters L6-05 and L6-06.
YES
The load has dropped or decreased
significantly.
Check for broken parts in the transmission system.
Digital Operator Display
Minor Fault Name
UL5
Mechanical Weakening Detection 2
The operation conditions matched the conditions set to L6-08.
Cause
Possible Solution
Minor Fault
(H2-
oo
= 10)
Undertorque was detected and matched the
condition of mechanical loss detection
operation selection (L6-08).
Check the load side for any problems.
YES
6.5 Alarm Detection
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
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Troubleshooting