Cause Possible Solutions
Minor Fault
Output
(H2-
oo = 10)
Inappropriate parameter settings. Check parameters L6-02 and L6-03. YES
There is a fault on the machine side (e.g., the machine is
locked up).
• Check the status of the machine.
• Remove the cause of the fault.
YES
LED Operator Display Minor Fault Name
oL4
Overtorque 2
Drive output current (or torque in OLV) was greater than L6-05 for longer than the time set in L6-06.
Cause Possible Solutions
Minor Fault
Output
(H2-
oo = 10)
Parameter settings are not appropriate. Check parameters L6-05 and L6-06. YES
There is a fault on the machine side (e.g., the machine is
locked up).
• Check the status of the machine being used.
• Remove the cause of the fault.
YES
LED Operator Display Minor Fault Name
oS
Overspeed (for Simple V/f with PG)
Pulse input (RP) indicates that motor speed feedback exceeded F1-08 setting.
Cause Possible Solutions
Minor Fault
Output
(H2-
oo = 10)
Overshoot or undershoot is occurring.
• 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).
YES
PG pulse settings are incorrect. Set the H6-02 (Pulse Train Input Scaling) = 100%, the number of pulses during maximum motor revolutions. YES
Parameter settings are inappropriate. Check the setting for the overspeed detection level and the overspeed detection time (F1-08 and F1-09). YES
LED Operator Display Minor Fault Name
ov
DC Bus Overvoltage
The DC bus voltage exceeded the trip point.
For 200 V class: approximately 410 V
For 400 V class: approximately 820 V (740 V when E1-01 < 400)
Cause Possible Solutions
Minor Fault
Output
(H2-
oo = 10)
Surge voltage present in the drive input power.
• 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.
YES
• The motor has 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.
YES
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.
YES
Set number of fault restarts (L5-01) to a value other than 0. YES
LED Operator Display Minor Fault Name
PASS MEMOBUS/Modbus Comm. Test Mode Complete
Cause
Possible Solutions
Minor Fault
Output
(H2-
oo = 10)
MEMOBUS/Modbus test has finished normally. This verifies that the test was successful. No output
LED Operator Display Minor Fault Name
PGo
PG Disconnect (for Simple V/f with PG)
Detected when no PG pulses received for a time longer than setting in F1-14.
Cause Possible Solutions
Minor Fault
Output
(H2-
oo = 10)
Pulse input (RP) is disconnected. Reconnect the pulse input (RP). YES
Pulse input (RP) wiring is wrong. Correct the wiring. YES
Motor brake is engaged. Ensure the brake releases properly YES
LED Operator Display Minor Fault Name
rUn
Motor Switch during Run
A command to switch motors was entered during run.
Cause Possible Solutions
Minor Fault
Output
(H2-
oo = 10)
A motor switch command was entered during run. Change the operation pattern so that the motor switch command is entered while the drive is stopped. YES
LED Operator Display Minor Fault Name
rUnC
Fault Reset when Run Command Entered
Fault reset was being executed when a run command was entered.
Cause Possible Solutions
Minor Fault
Output
(H2-
oo = 10)
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.
YES
LED Operator Display Minor Fault Name
UL3
Undertorque Detection 1
Drive output current (or torque in OLV) less than L6-02 for longer than L6-03 time.
6.5 Alarm Detection
YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
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Troubleshooting
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