YASKAWA J1000 Technical Manual page 143

6.5 Alarm Detection
Cause
Inappropriate parameter settings.
There is a fault on the machine side (e.g., the
machine is locked up).
LED Operator Display
Cause
Surge voltage present in the drive input
power.
• The motor is short-circuited.
• Ground current has over-charged the
main circuit capacitors via the drive input
power.
Noise interference causes the drive to
operate incorrectly.
LED Operator Display
PASS
Cause
MEMOBUS/Modbus test has finished
normally.
LED Operator Display
Cause
A digital input programmed to 67H
(MEMOBUS/Modbus test) was closed
while the drive was running.
LED Operator Display
Cause
Phase loss in the drive input power.
Loose wiring in the drive input power
terminals.
There is a problem with the drive input
power voltage.
142
Check parameters L6-02 and L6-03.
• Check the status of the machine.
• Remove the cause of the fault.
DC Bus Overvoltage
The DC bus voltage exceeded the trip point.
ov
For 200 V class: approximately 410 V
For 400 V class: approximately 820 V (740 V when E1-01 < 400)
• 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 Communication Test Mode Complete
This verifies that the test was successful.
SE MEMOBUS/Modbus Communication Test Mode Error
Stop the drive and run the test again.
Undervoltage
One of the following conditions occurred while the drive was in operation:
• DC bus voltage dropped below the under voltage detection level.
Uv
• 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.
Check for wiring errors in the main circuit drive input power. Correct the wiring.
• Ensure the terminals have been properly tightened.
• Apply the tightening torque specified in this manual to fasten the terminals.
Wire Gauges and Tightening Torque on page 39
• Check the voltage.
• Lower the voltage of the drive input power so that it is within the limits listed in the
specifications.
http://nicontrols.com
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 C710606 31B YASKAWA AC Drive – J1000 Technical Manual
Minor Fault
Output
(H2-01 = 10)
YES
YES
Minor Fault
Output
(H2-01 = 10)
YES
YES
YES
YES
Minor Fault
Output
(H2-01 = 10)
No output
Minor Fault
Output
(H2-01 = 10)
No output
Minor Fault
Output
(H2-01 = 10)
YES
YES
Refer to
YES