HOA Keypad Display Minor Fault Name
ov
DC Bus Overvoltage
The DC bus voltage exceeded the trip point.
• For 208 V: approximately 410 V
• For 480 V: approximately 820 V
Cause Possible Solutions
Surge voltage present in the drive input power
• Install an AC reactor.
• Voltage surge can result from a thyristor convertor and a phase advancing capacitor operating on
the same drive input power system.
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.
6.5 Alarm Detection
YASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual
249
6
Diagnostics &
Troubleshooting
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