TECO A510s - Warning; Self-Diagnosis Detection Function

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When the warning is no longer active the keypad will return to its original state.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 volta
g
e
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 volta
g
e
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.