Yaskawa J1000 Compact V/f Control Drive - Manual (Page 145)

Digital Operator Display Minor Fault Name
Surge voltage present in the drive
input power.
• Install an AC reactor or DC link choke.
• Voltage surge can result from a thyristor convertor and a phase
advancing capacitor operating on the same drive input power
system.
YES
• The motor is short-circuited.
• Ground current has
over-charged the main circuit
capacitors via the drive input
power.
• Check the motor power cable, relay terminals and motor terminal
box for short circuits.
• Correct grounding shorts and turn the power back on.
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.
Digital Operator Display Minor Fault Name
PASS MEMOBUS/Modbus Comm. Test Mode Complete
Cause Possible Solution
Minor
Fault
(H2- =
10)
MEMOBUS/Modbus test has
finished normally.
This verifies that the test was successful. No output
Digital Operator Display Minor Fault Name
SE MEMOBUS/Modbus Communication Test Mode Error
Cause Possible Solution
Minor
Fault
(H2- =
10)
Digital Operator Display Minor Fault Name
Uv
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 undervoltage detection level.
• Contactor to suppress inrush current in the drive was open.
• Low voltage in the control drive input power. This alarm outputs only if L2-01
is not 0 and DC bus voltage is below the detection level.
Cause Possible Solution
Minor
Fault
(H2- =
10)
5.5 Alarm Detection
YASKAWA ELECTRIC TOEP C710606 26D YASKAWA AC Drive – J1000 Quick Start Guide 145
5
Troubleshooting