Omron VARISPEED G7 -, Instruction Manual

Page: 352 / 417

Protective and Diagnostic Functions
7-
3
UV1
DC Bus
Undervolt
Main Circuit Undervoltage
The main circuit DC voltage is below
the Undervoltage Detection Level
(L2-05).
200 V class: Approx. 190 V
400 V class: Approx. 380 V
• 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.
Reset the fault after correcting its
cause.
UV2
CTL PS
Undervolt
Control Power Fault
The control power supply voltage
dropped. -
• Try turning the power supply
off and on.
• Replace the Inverter if the fault
continues to occur.
UV3
MC
Answer-
back
Inrush Prevention Circuit Fault
A fault occurred in the surge preven-
tion circuit. -
• Try turning the power supply
off and on.
• Replace the Inverter if the fault
continues to occur.
PF
Input Pha
Loss
Main Circuit Voltage Fault
The main circuit DC voltage oscillates
unusually (not when regenerating).
This fault is detected when L8-05 is
set to “Enabled.”
• 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.
Reset the fault after correcting its
cause.
LF
Output Pha
Loss
Output Open-phase
An open-phase occurred at the
Inverter output.
This fault is detected when L8-07 is
set to “Enabled.”
• There is a broken wire in the output
cable.
• There is a broken wire in the motor
winding.
• The output terminals are loose.
Reset the fault after correcting its
cause.
The motor being used has a capacity
less than 5% of the Inverter's maxi-
mum motor capacity.
Check the motor and Inverter
capacity.
OH
(OH1)
Heatsnk
Overtemp
(Heatsnk
MAX
Temp)
Cooling Fin Overheating
The temperature of the Inverter's cool-
ing fins exceeded the setting in L8-02
or 105
°
C.
The ambient temperature is too high. Install a cooling unit.
There is a heat source nearby. Remove the heat source.
The Inverter's cooling fan has stopped.
Replace the cooling fan. (Contact
our sales representative.)
Inverter's Cooling Fan Stopped
(18.5 kW or higher)
The Inverter's cooling fan has stopped.
OH3
Motor
Overheat 1
Motor Overheating Alarm
The Inverter will stop or will continue
to operate according to the setting of
L1-03.
The motor has overheated.
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).
OH4
Motor
Overheat 2
Motor Overheating Fault
The Inverter will stop according to the
setting of L1-04. The motor has overheated.
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).
Table 7.1 Fault Displays and Processing (Continued)
Display Meaning Probable Causes Corrective Actions