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ABNORMALITY DIAGNOSTIC
FUNCTION AND RESET METHOD
5.1 Details and Remedies for Various Fault Trips
The fault trip memory stores the causes of trip in monitor modes n20 to n23.
Even if the power is cut off, the fourth to the latest causes of trip will still be held. (Details
of factory inspection are stored in the memory before delivery.)
Display
Details and causes of
abnormality
Remedies
SC1 · Instantaneous overcurrent
during acceleration
· Check for any shorted output or ground.
· Eliminate sharp fluctuation at load side.
· Extend acceleration/deceleration time
(parameters P001, P002 and P317 to P322).
· Stop ON/OFF operation of magnetic
contactor at load side.
SC2
· Instantaneous overcurrent at
constant speed
SC3
· Instantaneous overcurrent
during deceleration
SC4
· Instantaneous overcurrent
during acceleration/
deceleration/constant speed
SC5
· Shorted output or overcurrent
during startup
· Check for any shorted output or ground.
SC6 · Failure detected during
startup
· Check the internal switching module
(Welcome to consult with us.)
OC1 · Overcurrent during
acceleration
· Check output for open phase and eliminate
sharp fluctuations at load side.
· Extend acceleration/deceleration time
(parameters P001, P002 and P317 to P322).
· Adjust torque boost level (parameter P011).
· Check for restart operation during normal operation.
· Stop ON/OFF operation of magnetic
contactor at load side.
OC2 · Overcurrent at constant speed
OC3 · Overcurrent during
deceleration
OU1 · Internal DC overvoltage
during acceleration
· Extend acceleration time (parameters P001, P317,
P319 and P321).
OU2 · Internal DC overvoltage at
constant speed
· Eliminate sharp fluctuations at load side.
OU3 · Internal DC overvoltage
during deceleration
· Extend deceleratin time (parameters P002,
P318, P320 and P322)
LU
· Power supply voltage below
85% of its rating
· Measure power supply voltage and check
input for open phase.
· Check ride-through restart function.
OL
· The output current exceeds
125% of electronic thermal
setting current or 140% of
rated current of inverter for
more than 1 minute.
· Check electronic thermal setting current.
· Check and adjust torque boost level
(parameter P011).
· Reduce the load.
OH
· Heat sink overheated
· Check ambient temperature.
AU
· External fault stop input signal
is input from control circuit
terminals.
· Check if the external signal is proper and if
timing circuit is correct.
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