TECO E510s Series - Page 321

5-2
LED display Description Cause Possible solutions
Over voltage
DC bus voltage exceeds
the OV detection level：
200V class: 410Vdc
400V class: 820Vdc
 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.
Low Voltage
DC bus voltage is lower
than the UV detection
level or the pre-charge
contactor is not active
while the inverter is
running.
200V class: 190Vdc
400V class: 380Vdc
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.
Input phase
loss
Phase loss at the input
side of the inverter or
input voltage imbalance,
active when 08-09 = 1
(enabled).
 Wiring loose in inverter input
terminal.
 Momentary power loss.
 Input voltage imbalance.
 Check input wiring / faster
screws.
 Check power supply.
Output phase
loss
Phase loss at the output
side of the inverter,
active when 08-10 = 1
(enabled).
 Wiring loose in inverter output
terminal.
 Motor rated current is less than
10% of the inverter rated current.
 Check output wiring / faster
screws.
 Check motor & inverter
rating.
OH1
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