YASKAWA AC Drive-A1000 Technical Manual page 322

6.5 Alarm Detection
Noise interference causes the drive to
operate incorrectly.
PG cable is disconnected.
PG cable wiring is wrong.
Noise interference along PG encoder
wiring.
Digital Operator Display
Cause
MEMOBUS/Modbus test has finished
normally.
Digital Operator Display
Cause
PG cable is disconnected.
PG cable wiring is wrong.
PG encoder does not have enough power. Make sure the correct power supply is properly connected to the PG encoder.
Brake is holding the PG.
Digital Operator Display
Cause
PG cable is disconnected.
Digital Operator Display
Cause
A motor switch command was entered
during run.
Digital Operator Display
Cause
A digital input set to 67H (MEMOBUS/
Modbus test) was closed while the drive
was running.
Digital Operator Display
Cause
IGBTs have reached 90% of their expected
performance life.
Digital Operator Display
Cause
Inappropriate parameter settings.
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• 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.
Reconnect the cable.
Correct the wiring.
Separate PG wiring from the source of the noise (often output wiring from the drive).
PASS MEMOBUS/Modbus Comm. Test Mode Complete
This verifies that the test was successful.
PG Disconnect (for Control Mode with PG)
PGo
Detected when no PG pulses are received for a time longer than setting in F1-14.
Reconnect the cable.
Correct the wiring.
Ensure the brake releases properly
PG Hardware Fault (detected when using a PG-X3 option card)
PGoH
PG cable has become disconnected.
Reconnect the cable.
Motor Switch during Run
rUn
A command to switch motors was entered during run.
Change the operation pattern so that the motor switch command is entered while the drive is stopped.
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%)
TrPC
IGBTs have reached 90% of their expected performance life.
Replace the drive.
Undertorque Detection 1
UL3
Drive output current (or torque in OLV, CLV, AOLV/PM, CLV/PM) less than L6-02 for longer than L6-03
time.
Check parameters L6-02 and L6-03.
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
Possible Solutions
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual