YASKAWA U1000 Series Technical Manual page 363

Digital Operator Display
Cause
External operator is not properly connected to the drive.
Digital Operator Display
Cause
Overshoot is occurring.
Incorrect speed feedback scaling if terminal RP is used
as speed feedback input in V/f control.
Incorrect number of PG pulses has been set.
Inappropriate parameter settings.
Digital Operator Display
Cause
Ground fault in the output circuit causing the capacitor
to overcharge.
Drive input power voltage is too high.
The capacity of the input power supply is too small.
The input power supply repeatedly turned on and off
over a short period of time.
An I/O terminal is loose.
Chattering is occurring in the magnetic contactor (MC)
installed between the drive's output terminals and the
motor.
There is a phase loss or an imbalance in the interphase
voltages of the input power supply.
Digital Operator Display
Cause
PG cable is disconnected.
PG cable wiring is wrong.
PG has no power.
PG encoder brake is clamped shut.
Digital Operator Display
Cause
PG cable is disconnected.
Digital Operator Display
Cause
The safety circuit is damaged.
Digital Operator Display
Cause
Speed Search parameters are set to the wrong values.
The motor is coasting in the opposite direction of the
Run command.
YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
External Digital Operator Connection Fault
The external operator has been disconnected from the drive.
oPr
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).
• 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.
Overspeed
oS
The motor speed feedback exceeded the F1-08 setting.
• 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.
• 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.
Check and correct parameter F1-01.
Check the setting for the overspeed detection level and the overspeed detection time (F1-08 and F1-09).
Control Circuit Overvoltage
Voltage in the control circuit has exceeded the overvoltage level.
ov
• For 200 V class: approximately 450 V
• For 400 V class: approximately 900 V
• Check the motor wiring for ground faults.
• Correct grounding shorts and turn the power back on.
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
Use a power supply that has at least twice the input capacity of the drive.
Implement countermeasures so that chattering does not occur for the input power supply.
Check the tightening torque of the I/O terminals.
Implement countermeasures so that chattering does not occur for the MC.
Check the status of the input power supply and eliminate phase losses and imbalance.
PG Disconnect (for any control modes using a PG option card)
PGo
No PG pulses are received for longer than the time set to F1-14.
Reconnect the cable.
Correct the wiring.
Check the power line to the PG encoder.
Ensure the motor brake releases properly.
PG Hardware Fault (detected when using a PG-X3 option card)
PGoH
PG cable is not connected properly.
Reconnect the cable. Check the setting of F1-20.
Safety Circuit Fault
SCF
Safety Circuit Fault is detected.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your
nearest sales representative.
Too Many Speed Search Restarts
SEr
The number of Speed Search restarts exceeded the number set to b3-19.
• 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.
Enable Bi-Directional Speed Search (b3-14 = 1).
6.4 Fault Detection
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
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