User Manual of A90 Series Inverter
258
communication cable is
disconnected.
E17
Abnormality of
inverter
temperature sensor
The inverter temperature sensor
is disconnected or
short-circuited.
1.
Check whether the inverter
temperature sensor is
connected properly.
2.
Seek technical support.
E18
The soft start relay
is not engaged.
1.
The power supply fails
during operation.
2.
The input power supply is
subject to phase loss.
3.
The terminals of the input
power supply are loose.
4.
The voltage of the input
power supply drops too
much.
5.
The switch contacts of the
input power supply are
aging.
1.
Stop the inverter before
power-off, or directly reset
the fault.
2.
Check the input power
supply and wiring.
3.
Tighten the screws of input
terminals.
4.
Check the air circuit breaker
and contactor.
E19
Error of current
detection circuit
The detection circuit of the drive
board or control board is
damaged.
1.
Seek technical support.
E20
Stall fault
1.
The deceleration time is too
short.
2.
Error of dynamic brake for
deceleration.
3.
The load is too heavy.
1.
Increase the deceleration
time.
2.
Check the dynamic brake.
3.
Check whether the motor
cannot be stopped as it is
driven by another load.
E21
PID feedback
disconnection
1.
The PID feedback is greater
than the upper limit (F09.24)
or less than the lower limit
(F09.25), depending on the
type of the feedback sensor.
1.
Check whether the feedback
line falls off.
2.
Check whether the sensor is
working abnormally.
3.
Adjust the detection value of
feedback disconnection to a
reasonable level.
E24
Self-identification
error
1.
Press the STOP/RESET key
during parameter
identification.
2.
The external terminal stops
working (FRS = ON)
1.
Press the STOP/RESET key
to reset.
2.
The external terminal should
not be operated during
parameter identification.
