YASKAWA P1000 Technical Manual page 210

6.5 Alarm Detection
HOA Keypad Display
ov
Cause
Surge voltage present in the drive input power
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
210
DC Bus Overvoltage
The DC bus voltage exceeded the trip point.
• For 208 V Bypass Drives: approximately 410 V
• For 480 V Bypass Drives: approximately 820 V
• 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.
• 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
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.
YASKAWA SIEP YAIP1B 01B YASKAWA AC Drive – P1000 Bypass Technical Manual
Minor Fault Name
Possible Solutions
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Minor Fault Name
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Minor Fault Name
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Minor Fault Name
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Minor Fault Name
Possible Solutions