TECHTOP TD350 - Page 246

TD350 Series VFD Troubleshooting
-241-
Fault
code
Fault type
Possible cause
Corrective measures
SPI
[13] Phase loss on
input side
Phase loss or violent
fluctuation occurred to R, S
and T input
Check the input power;
Check installation wiring
SPO
[14] Phase loss on
output side
Phase loss occurred to U, V,
W output (or the three
phases of motor is
asymmetrical)
Check the output wiring;
Check the motor and cable
OH1
[15] Overheat of
rectifier module
Air duct is blocked or fan is
damaged;
Ambient temperature is too
high;
Long-time overload running
Ventilate the air duct or replace
the fan;
Lower the ambient temperature
OH2
[16] Overheat of
VFD module
EF
[17] External fault
SI external fault input
terminal acts
Check external device input
CE
[18]
MODBUS/MODBUS
TCP communication
fault
Baud rate is set improperly;
Communication line fault;
Communication address
error;
Communication suffers from
strong interference
Set proper baud rate;
Check the wiring of
communication interfaces;
Set proper communication
address;
Replace or change the wiring to
enhance anti-interference
capacity
ItE
[19] Current
detection fault
Poor contact of the
connector of control board;
Hall component is damaged;
Exception occurred to
amplification circuit
Check the connector and
re-plug;
Replace the hall component;
Replace the main control board
tE
[20] Motor
autotuning fault
Motor capacity does not
match with the VFD capacity,
this fault may occur easily if
the difference between them
is exceeds five power
classes;
Motor parameter is set
improperly;
The parameters gained from
autotuning deviate sharply
from the standard
parameters;
Autotuning timeout
Change the VFD model, or
adopt V/F mode for control;
Set proper motor type and
nameplate parameters;
Empty the motor load and carry
out autotuning again;
Check motor wiring and
parameter setting;
Check whether upper limit
frequency is larger than 2/3 of
the rated frequency