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6.4 Fault Detection
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
363
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Digital Operator Display
Fault Name
oPr
External Digital Operator Connection Fault
The external operator has been disconnected from the drive.
Note:
An oPr fault will occur when all of the following conditions are true:
• Output is interrupted when the operator is disconnected (o2-06 = 1).
• The Run command is assigned to the operator (b1-02 = 0 and LOCAL has been selected).
Cause
Possible Solution
External operator is not properly connected to the drive.
• Check the connection between the operator and the drive.
• Replace the cable if damaged.
• Turn off the drive input power and disconnect the operator. Next reconnect the operator and turn the drive input power back on.
Digital Operator Display
Fault Name
oS
Overspeed
The motor speed feedback exceeded the F1-08 setting.
Cause
Possible Solution
Overshoot is occurring.
• Reduce the settings for C5-01 (Speed Control Proportional Gain 1) and increase C5-02 (Speed Control Integral Time 1).
• If using a Closed Loop Vector mode, enable Feed Forward and perform Inertia Auto-Tuning.
Incorrect speed feedback scaling if terminal RP is used
as speed feedback input in V/f control.
• Set H6-02 to the value of the speed feedback signal frequency when the motor runs at the maximum speed.
• Adjust the input signal using parameters H6-03 through H6-05.
Incorrect number of PG pulses has been set.
Check and correct parameter F1-01.
Inappropriate parameter settings.
Check the setting for the overspeed detection level and the overspeed detection time (F1-08 and F1-09).
Digital Operator Display
Fault Name
ov
Control Circuit Overvoltage
Voltage in the control circuit has exceeded the overvoltage level.
• For 200 V class: approximately 450 V
• For 400 V class: approximately 900 V
Cause
Possible Solution
Ground fault in the output circuit causing the capacitor
to overcharge.
• Check the motor wiring for ground faults.
• Correct grounding shorts and turn the power back on.
Drive input power voltage is too high.
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
The capacity of the input power supply is too small.
Use a power supply that has at least twice the input capacity of the drive.
The input power supply repeatedly turned on and off
over a short period of time.
Implement countermeasures so that chattering does not occur for the input power supply.
An I/O terminal is loose.
Check the tightening torque of the I/O terminals.
Chattering is occurring in the magnetic contactor (MC)
installed between the drive’s output terminals and the
motor.
Implement countermeasures so that chattering does not occur for the MC.
There is a phase loss or an imbalance in the interphase
voltages of the input power supply.
Check the status of the input power supply and eliminate phase losses and imbalance.
Digital Operator Display
Fault Name
PGo
PG Disconnect (for any control modes using a PG option card)
No PG pulses are received for longer than the time set to F1-14.
Cause
Possible Solution
PG cable is disconnected.
Reconnect the cable.
PG cable wiring is wrong.
Correct the wiring.
PG has no power.
Check the power line to the PG encoder.
PG encoder brake is clamped shut.
Ensure the motor brake releases properly.
Digital Operator Display
Fault Name
PGoH
PG Hardware Fault (detected when using a PG-X3 option card)
PG cable is not connected properly.
Cause
Possible Solution
PG cable is disconnected.
Reconnect the cable. Check the setting of F1-20.
Digital Operator Display
Fault Name
SCF
Safety Circuit Fault
Safety Circuit Fault is detected.
Cause
Possible Solution
The safety circuit is damaged.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your
nearest sales representative.
Digital Operator Display
Fault Name
SEr
Too Many Speed Search Restarts
The number of Speed Search restarts exceeded the number set to b3-19.
Cause
Possible Solution
Speed Search parameters are set to the wrong values.
• Reduce the detection compensation gain during Speed Search (b3-10).
• Increase the current level when attempting Speed Search (b3-17).
• Increase the detection time during Speed Search (b3-18).
• Repeat Auto-Tuning.
The motor is coasting in the opposite direction of the
Run command.
Enable Bi-Directional Speed Search (b3-14 = 1).
SIEP_C710636_02B_1_0.book 363 ページ 2015年11月25日 水曜日 午後4時56分