Omron SYSDRIVE 3G3RV, User Manual, Page: 365 / 446

Protective and Diagnostic Functions
7-
3
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
Main
Circuit MC Operation Failure
The
MC stopped responding during
Inverter
operation.
Applicable
Inverter Capacities
200
V class: 37 to 110 kW
400
V class: 75 to 300 kW
• 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.
• A
fault occurred in the surge pre-
vention
circuit.
Reset
the fault after correcting its
cause.
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.
MC
Answer-
back
Inrush Prevention Circuit Fault
Overheating
occurred in the inrush
resistor.
The
MC did not respond for 10 s even
though
the MC ON signal has been
output.
Applicable
Inverter Capacities
200
V class: 37 to 110 kW
400
V class: 75 to 300 kW
• The
MC in the main circuit failed.
• The
MC excitation coil is burned
out.
• Try
turning the power supply
off
and on.
• Replace
the Inverter if the fault
continues
to occur.
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.
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.
Heatsnk
Overtmp
( )
Heatsink
MAX
Temp
Cooling Fin Overheating
The
temperature of the Inverter's cool-
ing
fins exceeded the setting in L8-02
or
105 °
C.
OH:
The temperature exceeded the
setting
in L8-02 (Stopping method can
be
changed by L8-03.).
OH1:
The temperature exceeded
100
°
C
(Stopping method: Coast to
stop).
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
The
Inverter's cooling fan has stopped.
Table 7.1 Fault Displays and Processing (Continued)
Display Meaning Probable Causes Corrective Actions