DRV-28 inverter
s Troubleshooting
-232-
Fault
code
Fault type
Possible cause
Corrective measures
SPI
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
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
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
Overheat of inverter
module
EF
External fault
SI external fault input
terminal acts
Check external device input
CE
485 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
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
Motor autotuning
fault
Motor capacity does not
match with the inverter
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;
Change the inverter 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 setup;
Check whether upper limit
frequency is larger than 2/3 of
the rated frequency
