YASKAWA Varispeed G7 Instruction Manual page 394

Display
Control Power Fault
UV2
CTL PS The control power supply voltage
Undervolt dropped.
Inrush Prevention Circuit Fault
A fault occurred in the surge preven-
UV3
tion circuit.
MC
The magnetic contactor did not
Answer-
respond for 10 s even though the mag-
back
netic contactor ON signal has been
output.
Main Circuit Voltage Fault
The main circuit DC voltage oscillates
unusually (not when regenerating).
PF
This fault is detected if a load is
Input Pha
greater than approximately 80% of the
Loss
maximum motor capacity.
This fault is detected when L8-05 is
set to 1.
Output Open-phase
LF An open-phase occurred at the
Output Pha Inverter output.
Loss This fault is detected when L8-07 is
set to 1 or 2
Cooling Fin Overheating
The temperature of the Inverter's cool-
ing fins exceeded the setting in L8-02
or the overheat protection level.
OH: The temperature exceeded the
OH
setting in L8-02 (Stopping method can
(OH1)
be changed by L8-03.).
Heatsnk
OH1: The temperature exceeded
Overtemp
100°C (Stopping method: Coast to
(Heatsnk
stop).
MAX
Temp)
Inverter's Cooling Fan Fault
(200 V Class: 7.5 kW or more,
400 V Class: 5.5 kW or more)
This fault is detected when L8-32 is
set to 1.
-4
7
Table 7.1 Fault Displays and Processing (Continued)
Meaning
• The wiring of the control power cir-
cuit is incorrect.
• A Backup Capacitor Unit for
Momentary Power Loss is not
attached to a 200 V/400 V Class
Inverter of 7.5 kW or less and the
value of the Momentary power loss
ridethru time (L2-02) factory setting
has been changed to the larger
value.
• The magnetic contactor in the main
circuit failed.
• The magnetic contactor excitation
coil is burned out.
• 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 rated output cur-
rent.
The ambient temperature is too high.
There is a heat source nearby.
The Inverter's cooling fan has stopped.
• A short-circuit between +V, −V, and
AC terminals occurred.
• Overload in the control circuit ter-
minal.
• The Inverter's cooling fan has
stopped.
• The heatsink is clogged.
Probable Causes
• Try turning the power supply
• Replace the Inverter if the fault
• Attach a Backup Capacitor Unit
• Try turning the power supply
• Replace the Inverter if the fault
Reset the fault after correcting its
cause.
Reset the fault after correcting its
cause.
Check the motor and Inverter
capacity.
Install a cooling unit.
Remove the heat source.
Replace the cooling fan. (Contact
our sales representative.)
• Make sure that incorrect wiring
• Check the resistance and wir-
• Replace the cooling fan. (Con-
• Clean the heatsink.
Corrective Actions
off and on.
continues to occur.
for Momentary Power Loss.
off and on.
continues to occur.
has not been done.
ing for the frequency setting
potentiometer, etc. (Check that
the current for terminals +V and
–V is 20 mA or less.)
tact our sales representative.)