Yaskawa Matrix Converter - Manual (Page 324)

Protective and Diagnostic Functions
7-
3
GF
Ground
Fault
Ground Fault *
The ground fault current at the MxC
output exceeded approximately 50%
of the MxC rated output current.
A ground fault occurred at the MxC
output. A ground fault may be due to a
damaged motor, worn insulation, or a
bad cable.
Clear the fault after cycling power
or removing the cause of the prob-
lem.
Note: Before turning the power
back on again, make sure that
there is no short-circuit or ground
fault for the MxC output.
AUV
Power UV
Power Supply Undervoltage
The power supplied to the MxC is
below the minimum amount set to L2-
21.
200 V class: Approx. 150 VAC
400 V class: Approx. 300 VAC
• The power capacity is too small.
• The power distortion is too large.
• Increase the power capacity.
• Decrease the impedance of the
input power wiring.
For details, refer to MxC Applica-
tion Precautions in Chapter 10.
An open phase occurred in the input
power supply.
Check and correct the open-phase
condition or the imbalance of the
input power.
Clear the fault after correcting the
problem or removing its cause.
Check whether there is short-circuit
between the following terminals.
R/L1 ← → r2,
S/L2 ← → s2,
T/L3 ← → t2
If no short-circuit is found, then the
problem may be a damaged fuse.
Replace the MxC.
OV
PS Over-
volt
Control Circuit Overvoltage
The control circuit voltage exceeded
the overvoltage detection level.
200 V class: Approx. 410 V
400 V class: Approx. 870 V
The power supply voltage is too high.
Decrease the voltage to be within
specifications.
• The terminal of the input power is
loosened.
• The magnetic contactor is turned on
or off at the MxC output side.
Clear the fault after correcting the
problem or removing its cause.
The power supply has an open phase.
Check and correct the open-phase
condition or the imbalance of the
input power.
Clear the fault after correcting the
problem or removing its cause.
AOV
Power OV
Power Supply Overvoltage
The control-circuit voltage exceeded
the overvoltage detection level.
200 V class: Approx. 250 V
400 V class: Approx. 550 V
• The power-supply voltage is too
high.
• The power capacity is too small.
• The power distortion is too large.
• Decrease the voltage to be
within specifications.
• Increase the power capacity.
• Decrease the impedance of the
input power wiring.
For details, refer to MxC Applica-
tion Precautions in Chapter 10.
An open phase occurred in the input
power supply.
Check and correct the open-phase
condition or the imbalance of the
input power.
Clear the fault after correcting the
problem or removing its cause.
* The ground fault here is one which occurs in the motor wiring while the motor is running. A ground fault may not be detected in the following cases.
y A ground fault with low resistance which occurs in motor cables or terminals.
y A ground fault occurs when the power is turned on.
Table 7.1 Fault Displays and Processing (Continued)
Display Meaning Probable Causes Corrective Actions