YASKAWA Z1000 User Manual page 225

HOA Keypad Display
The motor is short-circuited
Ground current has overcharged the main circuit
capacitors via the drive input power
Noise interference causes the drive to operate
incorrectly
HOA Keypad Display
PASS
Cause
MEMOBUS/Modbus test has finished normally
HOA Keypad Display
SAFE
Cause
External contact from customer wiring is open.
HOA Keypad Display
SE
Cause
A digital input set to 67H (MEMOBUS/Modbus
test) was closed while the drive was running
HOA Keypad Display
TrPC
Cause
IGBTs have reached 90% of their expected
performance life
HOA Keypad Display
UL3
Cause
Inappropriate parameter settings
Load has dropped or decreased significantly
HOA Keypad Display
UL6
Cause
The load has dropped or decreased under the motor
underload curve
HOA Keypad Display
Uv
YASKAWA ELECTRIC TOEP C710616 45F YASKAWA AC Drive – Z1000 User Manual
• Check the motor power cable, relay terminals and motor terminal box for short circuits.
• Correct grounding shorts and turn the power back on.
• 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.
MEMOBUS/Modbus Comm. Test Mode Complete
This verifies that the test was successful.
Customer Safety
Customer Safeties mult-function input is open. This alarm has display priority over the Interlock Open
(inTLK).
Check the cause of the open safety.
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).
Stop the drive and run the test again.
IGBT Maintenance Time (90%)
IGBTs have reached 90% of their expected performance life.
Replace the drive.
Undertorque Detection 1
Drive output current less than L6-02 for longer than L6-03 time.
Check parameters L6-02 and L6-03.
Check for broken parts in the transmission system.
Undertorque Detection 6
Check parameters L6-13 and L6-14.
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.
Minor Fault Name
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
5.5 Alarm Detection
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