YASKAWA G7 Series Technical Manual page 385

Display Meaning
Main Circuit Undervoltage
The main circuit DC voltage is below
UV1
the Undervoltage Detection Level
DC Bus
(L2-05).
Undervolt
200-240 V class: Approx. 190 V
380-380 V class: Approx. 380 V
UV2 Control Power Fault
CTL PS The control power supply voltage
Undervolt dropped.
UV3
Inrush Prevention Circuit Fault
MC
A fault occurred in the surge preven-
Answer-
tion circuit.
back
Main Circuit Voltage Fault
PF The main circuit DC voltage oscillates
Input Pha unusually (not when regenerating).
Loss This fault is detected when L8-05 is
set to "Enabled."
Output Open-phase
LF An open-phase occurred at the Drive
Output Pha output.
Loss This fault is detected when L8-07 is
set to "Enabled."
OH
Cooling Fin Overheating
(OH1)
The temperature of the Drive's cooling
Heatsnk
fins exceeded the setting in L8-02 or
Overtemp
105°C.
(Heatsnk
MAX
Drive's Cooling Fan Stopped
Temp)
(18.5 kW or higher)
Motor Overheating Alarm
OH3
The Drive will stop or will continue to
Motor
operate according to the setting of L1-
Overheat 1
03.
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Table 7.1 Fault Displays and Processing (Continued)
Probable Causes
• An open-phase occurred with the
input power supply.
• A momentary power loss occurred.
• The wiring terminals for the input
power supply are loose.
• The voltage fluctuations in the input
power supply are too large.
• An open-phase occurred in the input
power supply.
• A momentary power loss occurred.
• The wiring terminals for the input
power supply are loose.
• The voltage fluctuations in the input
power supply are too large.
• The voltage balance between phases
is bad.
• There is a broken wire in the output
cable.
• There is a broken wire in the motor
winding.
• The output terminals are loose.
The motor being used has a capacity
less than 5% of the Drive's maximum
motor capacity.
The ambient temperature is too high.
There is a heat source nearby.
The Drive's cooling fan has stopped.
The Drive's cooling fan has stopped.
The motor has overheated.
Protective and Diagnostic Functions
Corrective Actions
Reset the fault after correcting its
cause.
• Try turning the power supply
off and on.
-
• Replace the Drive if the fault
continues to occur.
• Try turning the power supply
off and on.
-
• Replace the Drive if the fault
continues to occur.
Reset the fault after correcting its
cause.
Reset the fault after correcting its
cause.
Check the motor and Drive capac-
ity.
Install a cooling unit.
Remove the heat source.
Replace the cooling fan. (Contact
our sales representative.)
Check the size of the load and the
length of the acceleration, deceler-
ation, and cycle times.
Check the V/f characteristics.
Check the Motor Rated Current
(E2-01).
3
7-