10-7
10.3 Warning / Self-diagnosis Detection Function
When the inverter detects a warning, the keypad displays a warning code (flash).
Note:
The fault contact output does not energize on a warning and the inverter continues operation. When the
warning is no longer active the keypad will return to its original state.
When the inverter detected a programming error (for example two parameters contradict each other of are set to
an invalid setting), the keypad displays a self-diagnostics code.
Note:
The fault contact output does not energize on a self-diagnostics error. While a self-diagnostics code is
active the inverter does not accept a run command until the programming error is corrected.
Note:
When a warning or self- diagnostic error is active the warning or error code will flash on the keypad. When
the RESET key is pressed, the warning message (flash) disappears and returns after 5 sec. If the warning or
self-diagnostic error still exists.
Refer to Table 10.3.1 for and overview, cause and corrective action for inverter warnings and self-diagnostic
errors.
Table 10.3.1 warning / self-diagnosis and corrective actions
LED display
Description
Possible causes
Corrective action
OV
(flash)
Over voltage
DC bus voltage exceeds
the OV detection level:
410Vdc: 200V class
820Vdc: 400V class
1050Vdc:575V class
1230Vdc:690V class
(for 440V class, if input
voltage 01-14 is set lower
than 400V, the OV
detection value will is
decreased to 700Vdc)
Deceleration time set too
short, resulting in
regenerative energy flowing
back from motor to the
inverter.
The inverter input voltage is
too high.
Use of power factor
correction capacitors.
Excessive braking load.
Braking transistor or resistor
defective.
Speed search parameters set
incorrectly.
Increase deceleration time
Reduce input voltage to
comply with the input
voltage requirements or
install an AC line reactor to
lower the input voltage.
Remove the power factor
correction capacitor.
Use dynamic braking unit.
Replace braking transistor
or resistor.
Adjust speed search
parameters.
UV
(flash)
under voltage
DC bus voltage is lower
than the UV detection
level or the pre-charge
contactor is not active
while the inverter is
running.
190Vdc: 200V class;
380Vdc: 400V class
546Vdc:575/690V class
(the detection value can
be adjusted by 07-13)
The input voltage is too low.
Input phase loss.
Acceleration time set too
short.
Input voltage fluctuation.
Pre-charge contactor
damaged.
DC bus voltage feedback
signal value not incorrect.
Check the input voltage.
Check input wiring.
Increase acceleration time.
Check power source
Replace pre-charge
contactor
Replace control board or
complete inverter.
OH2
(flash)
Inverter over
heating
Inverter overheat warning
Multi-function digital input
set to 32. (Terminal S1 ~
S8) Active when 03-00 ~
Multifunction digital input
overheat warning active.
Multi-function input
function set incorrectly.
Check wiring