YASKAWA Z1000 User Manual page 223

Digital Operator Display
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.
Digital Operator Display
PASS
Cause
MEMOBUS/Modbus test has finished
normally.
Digital Operator Display
Cause
A digital input set to 67H (MEMOBUS/
Modbus test) was closed while the drive
was running.
Digital Operator Display
TrPC
Cause
IGBTs have reached 90% of their expected
performance life.
YASKAWA TOEP YAIZ1U 03B YASKAWA AC Drive – Z1000 User Manual
DC Bus Overvoltage
ov
The DC bus voltage exceeded the trip point.
For 600 V class drives: approximately 1040 V
• Install a DC link choke or 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.
MEMOBUS/Modbus Communication Test Mode Error
SE
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.
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
5.5 Alarm Detection
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