TECO E510s Series - Page 326

5-7
Table 2 Warning/Self-diagnosis and Corrective actions
LED display Description Cause Possible solutions
OV (flash)
Over voltage
DC bus voltage exceeds
the OV detection level：
200V class：410Vdc
400V class：820Vdc
(for 400V 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.
 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.
 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
(the detection value can
be adjusted by 07-13)
 The input voltage is too low.
 Input phase loss.
 DC bus voltage feedback signal
value not incorrect.
 Check the input voltage.
 Check input wiring.
 Replace control board or
complete inverter.
OH1 (flash)
Heatsink
overheat
The temperature of the
heat sink is too high.
Note: when OH1 fault
occurs three times
within five minutes, it is
required to wait 10
minutes before
resetting the fault.
 Ambient temperature too high.
 Cooling fan failed
 Carrier frequency set too high.
 Load too heavy.
 Install fan or AC to cool
surroundings.
 Replace cooling fan.
 Reduce carrier frequency.
 Reduce load / Measure
output current
OH3 (flash)
Motor over
Heating
warning
Motor over heating
 PTC input level is higher than
08-43
 Multi-function input
function set incorrectly.
 Check wiring
OT (flash)
Over torque
detection
Inverter output torque is
higher than 08-15 (over
torque detection level)
for the time specified in
08-16. Parameter 08-14
= 0 to activate.
 Load too heavy.
 Check over torque
detection parameters
(08-15 / 08-16).
 Check and reduce motor
load, check and operation
duty cycle.
OL1
Motor
Overload
Internal motor overload
protection tripped,
active when protection
curve 08-05=xxx1
 Voltage setting V/F modetoo
high, resulting in
over-excitation of the motor.
 Motor overload current (02-01)
set incorrectly.
 Motor load too heavy
 Check V/F curve.
 Check motor load current
 Check and reduce motor
load, check and operation
duty cycle.