YASKAWA V1000 Series Technical Manual page 241

Cause
Inappropriate parameter settings.
There is a fault on the machine side (e.g., the machine is
locked up).
LED Operator Display
Cause
Parameter settings are not appropriate.
There is a fault on the machine side (e.g., the machine is
locked up).
LED Operator Display
Cause
Overshoot or undershoot is occurring.
PG pulse settings are incorrect.
Parameter settings are inappropriate.
LED Operator Display
Cause
Surge voltage present in the drive input power.
• The motor has 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
Pulse input (RP) is disconnected.
Pulse input (RP) wiring is wrong.
Motor brake is engaged.
LED Operator Display
Cause
A motor switch command was entered during run.
LED Operator Display
rUnC
Cause
Fault reset was being executed when a run command was
entered.
LED Operator Display
YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
Check parameters L6-02 and L6-03.
• Check the status of the machine.
• Remove the cause of the fault.
Overtorque 2
oL4
Drive output current (or torque in OLV) was greater than L6-05 for longer than the time set in L6-06.
Check parameters L6-05 and L6-06.
• Check the status of the machine being used.
• Remove the cause of the fault.
Overspeed (for Simple V/f with PG)
oS
Pulse input (RP) indicates that motor speed feedback exceeded F1-08 setting.
• Adjust the gain by using the pulse train input parameters (H6-02 through H6-05).
• Adjust the speed feedback accuracy.
• Increase the settings for C5-01 (Speed Control Proportional Gain 1) and reduce C5-02 (Speed Control Integral Time
1).
Set the H6-02 (Pulse Train Input Scaling) = 100%, the number of pulses during maximum motor revolutions.
Check the setting for the overspeed detection level and the overspeed detection time (F1-08 and F1-09).
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 reactor 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.
PG Disconnect (for Simple V/f with PG)
PGo
Detected when no PG pulses received for a time longer than setting in F1-14.
Reconnect the pulse input (RP).
Correct the wiring.
Ensure the brake releases properly
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.
Fault Reset when Run Command Entered
Fault reset was being executed when a run command was entered.
• Ensure that a run command cannot be entered from the external terminals or option card during fault reset.
• Turn off the run command.
Undertorque Detection 1
UL3
Drive output current (or torque in OLV) less than L6-02 for longer than L6-03 time.
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
Minor Fault Name
Possible Solutions
Minor Fault Name
6.5 Alarm Detection
Minor Fault
Output
(H2-oo = 10)
YES
YES
Minor Fault
Output
(H2-oo = 10)
YES
YES
Minor Fault
Output
(H2-oo = 10)
YES
YES
YES
Minor Fault
Output
(H2-oo = 10)
YES
YES
YES
YES
Minor Fault
Output
(H2-oo = 10)
No output
Minor Fault
Output
(H2-oo = 10)
YES
YES
YES
6
Minor Fault
Output
(H2-oo = 10)
YES
Minor Fault
Output
(H2-oo = 10)
YES
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