YASKAWA CR700, Техническое руководство, Страница: 359 / 886

Troubleshooting
6
6.4 Fault
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual 359
Code Name Causes Possible Solutions
The braking load is too large. Connect a dynamic braking option to the drive.
Surge voltages are entered into input power supply. Connect a DC reactor to the drive.
Note:
Within the same power supply system, turning phase
advancing capacitors on and off, and operating thyristor
converters may apply surge voltages and cause the input
voltage to rise abnormally.
The drive output cable or motor is shorted to ground
(the current short to ground is charging the main
circuit capacitor of the drive through the power
supply).
1. Examine the motor main circuit cable, terminals, and motor
terminal box, and then remove ground faults.
2. Re-energize the drive.
The power supply voltage is too high. Decrease the power supply voltage so that it matches the drive
rated voltage.
The braking resistor or braking resistor unit wiring
is incorrect.
Correct wiring errors in the connection to the braking resistor or
braking resistor unit.
The encoder cable is incorrectly wired or
disconnected.
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
Noise interference along the encoder cable. Separate the encoder cable from the source of the noise such as
the drive output line.
A drive malfunction occurred due to electrical
interference.
• Examine the control circuit lines, main circuit lines, and
ground wiring, and decrease the effects of electrical
interference.
• Make sure that a magnetic contactor is not the source of the
electrical interference, then use a Surge Protective Device if
necessary.
The load inertia is not set correctly. • Examine the load inertia settings when using Stall Prevention
during Deceleration function.
• Adjust L3-25 [Load Inertia Ratio] settings in accordance with
the machine.
Motor hunting occurs. • Adjust the parameters that control hunting.
• Adjust n1-02 [Hunting Prevention Gain Setting] settings.
• Adjust n2-02 [Automatic Freq Regulator Time 1] and n2-03
[Automatic Freq Regulator Time 2] settings.
Note:
• The drive detects this fault if the DC bus voltage is more than the ov detection level while the drive is running.
• The ov detection level is approximately 410 V with 200 V class drives. The detection level is approximately 820 V with 400 V class drives.
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
PF Input Phase Loss
There is a phase loss in the drive input power. Correct errors with the wiring for main circuit drive input power.
There is loose wiring in the drive input power
terminals.
Tighten the terminal screws to the correct tightening torque.
The drive input power voltage is changing too
much.
• Examine the input power for problems.
• Make the drive input power stable.
• If the input power supply is good, examine the magnetic
contactor on the main circuit side for problems.
There is unsatisfactory balance between voltage
phases.
• Examine the input power for problems.
• Make the drive input power stable.
• Set L8-05 = 0 [Input Phase Loss Protection Sel = Disabled] .
The main circuit capacitors have become
unserviceable.
• Examine the capacitor maintenance time in monitor
U4-05
[CapacitorMaintenance] . If U4-05 is more than 90%, replace
the control board or the drive. For information about replacing
the control board, contact Yaskawa or your nearest sales
representative.
• If drive input power is correct and the fault stays, replace the
control board or the drive. For information about replacing the
control board, contact Yaskawa or your nearest sales
representative.
Note:
• The drive detects this error if the DC bus voltage changes irregularly without regeneration.
• Do a Fault Reset to clear the fault.
• Use L8-05 to enable and disable PF detection.
Code Name Causes Possible Solutions
PGo Encoder (PG) Feedback Loss
The encoder cable is disconnected or wired
incorrectly.
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
The encoder is not receiving power. Examine the encoder power supply.
The holding brake is stopping the motor. Release the holding brake.
Note:
• The drive detects this error if it does not receive the speed detection pulse signal from the encoder in the detection time set in
F1-14 [Encoder Open-Circuit Detect Time]
.
• Do a Fault Reset to clear the fault.
• If the drive detects this error, it will operate the motor as specified by the Stopping Method set in
F1-02 [PG Open Circuit Detection Select]
.