Yaskawa AC Drive P1000 Bypass Technical Manual - Manual (Page 195)

The motor is short-circuited
• Check the motor power cable, relay terminals and motor terminal box for short circuits.
• Correct grounding shorts and turn the power back on.
Ground current has overcharged the main circuit
capacitors via the drive input power
Noise interference causes the drive to operate
incorrectly
• Review possible solutions for handling noise interference.
• Review section on handling noise interference and check control circuit lines, main circuit lines
and ground wiring.
• If the magnetic contactor is identified as a source of noise, install a surge protector to the MC coil.
Set number of fault restarts (L5-01) to a value other than 0.
HOA Keypad Display Minor Fault Name
PASS MEMOBUS/Modbus Comm. Test Mode Complete
Cause Possible Solutions
MEMOBUS/Modbus test has finished normally This verifies that the test was successful.
HOA Keypad Display Minor Fault Name
SAFE
Customer Safety
Customer Safeties mult-function input is open. This alarm has display priority over the Interlock Open
(inTLK).
Cause Possible Solutions
External contact from customer wiring is open. Check the cause of the open safety.
HOA Keypad Display Minor Fault Name
SE MEMOBUS/Modbus Communication Test Mode Error
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.
HOA Keypad Display Minor Fault Name
TrPC
IGBT Maintenance Time (90%)
IGBTs have reached 90% of their expected performance life.
Cause Possible Solutions
IGBTs have reached 90% of their expected
performance life
Replace the drive.
HOA Keypad Display Minor Fault Name
UL3
Undertorque Detection 1
Drive output current 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.
HOA Keypad Display Minor Fault Name
UL6 Undertorque Detection 6
Cause Possible Solutions
The load has dropped or decreased under the motor
underload curve
Check parameters L6-13 and L6-14.
HOA Keypad Display Minor Fault Name
Uv
Undervoltage
One of the following conditions was true when the drive was stopped and a Run 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.
Cause Possible Solutions
Phase loss in the drive input power Check for wiring errors in the main circuit drive input power. Correct the wiring.
6.5 Alarm Detection
YASKAWA SIEP YAIP1B 01A YASKAWA AC Drive – P1000 Bypass Technical Manual 195
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Diagnostics & Troubleshooting