User Manual
EM303B General Purpose Inverter
165
Trip
Code
Trip
Cause
Corrective Action
SlU
Stable
Undervoltage/SOFT
Soft-start failure
1. Input power phase loss.
2. Wiring terminal of input
power is loose.
3. Input power voltage drops
too much.
4. Switch contact of input
power is aging.
1. Check input power supply.
2. Tighten screws on input
terminals.
3. Check air switch and
contactor.
IlP
Input Phase Loss
1. Input power phase loss.
1. Check input power supply.
2. Check wiring of input
power supply.
3. Check if wiring terminal is
loose.
Ol
Overload/Stall Time
Is too Long
(The faults of OL and
OL1 are displayed as
OL.)
1. Acceleration/deceleration
time is too short.
2. In V/F control mode, the
setting value of torque boost is
too big.
3. Load is too heavy.
4. Inverter is in stall status for a
long time.
Prolong
acceleration/deceleration
time.
Reduce setting value of
torque boost.
Replace with the inverter
which is applicable to the
load.
Check if the motor cannot
stop by other load.
OH
Heat Sink
Overheating
1. Ambient temperature is too
high.
2. Poor ventilation.
3. Cooling fans are broken
down.
The service environment of
inverter should meet the
requirements.
Improve environmental
ventilation, and check if the
vent of inverter is blocked.
Replace air cooling fan.
EXT
External Fault
1. External device fault
terminal is on.
1. Check external device.
INP
Internal Faults
1. The system running time is
up.
Please contact the distributor.
EED
Inverter EEPROM
Failure
1. Interference makes
EEPROM read-write
mistakes.
2. EEPROM is damaged.
1. Press
STOP
RESET
to reset, and
then retry.
2. Technical support is
required.
EEU
Keypad EEPROM
Failure
STP
Autotuning
Cancelled
1. During autotuning, press
STOP
RESET
.
1. Press
STOP
RESET
to reset.
SFE
Coast-to-stop in
Autotuning
1. In the process of
autotuning, the external
coast-to-stop terminal
FRS=ON.
1. Press
STOP
RESET
to reset.