5.4 Fault Detection
YASKAWA ELECTRIC TOEP C710687 02B FSDrive-MV1000 Instructions 161
Table 5.13 Option Card Installation
Digital Operator Display Fault Name
Uv1
Undervoltage
One of the following conditions occurred while the drive was operating (during voltage output):
• Voltage in the DC bus fell below the undervoltage detection level (L2-05)
• 2 kV class: Approx. 693 V
• 3 kV class: Approx. 940 V
• 4 kV class: Approx. 1188 V
• 6 kV class: Approx. 1188 V
• 11 kV class: Approx. 1188 V
Cause Possible Solutions
Input power phase loss
• Check that the main circuit drive input power is wired incorrectly.
• Correct the wiring.
One of the drive input power wiring terminals is
loose.
• Ensure there are not loose terminals
• Retighten the terminals to the tightening torques specified in this manual. Refer to Wire
Gauges and Tightening Torques on page 91 for details.
There is a problem with the voltage from the
drive input power.
• Check the voltage.
• Correct the voltage to be within the range listed in drive input power specifications.
• If there is no problem with the power supply to the main circuit, check for problems with the
main circuit breaker.
The power has been interrupted. Correct the drive input power.
Digital Operator Display Fault Name
Uv3
In-rush Prevention Circuit Error
A malfunction has occurred in the in-rush prevention circuit.
Cause Possible Solutions
There is an error in the in-rush prevention circuit
breaker.
• Check the breaker maintenance period in U4-06 (in-rush prevention circuit breaker).
• Replace the breaker if it has reached the end of its service life, or has failed. Maintenance
settings are performed in o4-07.
There is an error in the in-rush prevention panel
control power.
• Check that there are no wiring breaks or miswirings in the control power wiring.
• Perform wiring correctly.
The breaker close command is not being input to
the in-rush prevention panel.
• Check that there are no wiring breaks or miswirings between the drive and the in-rush
prevention panel.
• Check that there are no errors in the drive contact outputs.
• Perform wiring correctly or replace the relay board.
Digital Operator Display Fault Name
VUB
Voltage Unbalance
The sum of the detected output voltages of the three phases exceeded the detection level for
longer than the stipulated time.
Cause Possible Solutions
The motor has been damaged due to overheating
or the motor insulation is damaged.
Check the insulation resistance of the motor. Replace the motor.
One of the motor cables has short circuited or
there is a grounding problem.
Check the motor cable. Remove the short circuit and reapply power.
Check the resistance between the motor cables and the ground terminal .
Replace the cable.
The output side cable wiring is incorrect. Correct the wiring.
<1> When a fault occurred at the startup of the drive, CPF00 or CPF20 is displayed. When a fault occurred after the startup, CPF01 or CPF21 is
displayed.
Option Card
<1> When used for monitoring, AI-A3 and DI-A3 can be installed in any of CN5-A, B or C.
<2> Use port CN5-C when connecting one PG option card. Use ports CN5-B and CN5-C when connecting two PG option cards.
Available Port/Connector Number of Option Cards Possible
SI-N3, SI-P3, AI-A3, DI-A3
<1> CN5-A 1
PG-B3, PG-X3 CN5-B, C <2> 2
DO-A3, AO-A3 CN5-A, B, C 1
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