User Manual
EM303A General Purpose Inverter
123
9 Troubleshooting
9.1 Faults
When anything unexpected happens, the corresponding trip code and parameters will
be displayed on the keypad, fault relay acts, fault output terminal is on, and inverter
output stops. When fault occurs, if the motor is running, it will coast to stop. See Table
9-1 for EM303A fault trips and troubleshootings.
Table 9-1 EM303A Fault Trips and Troubleshootings
Trip
Code
Trip Cause Corrective Action
SC
Short
Circuit
1. Short circuit between inverter output
hases, or between the output phases and
ground.
2. IGBT is damaged.
1. Check, take corrective actions,
and then reset.
2. Technical support is required.
HOC
Instantaneous
Overcurrent
1. Short circuit between inverter output
phases or between the output phases and
ground.
2. When load is too heavy, the
acceleration/deceleration time is too short.
3. In V/F control mode, the setting value
of torque boost is too big.
4. The motor is rotating when inverter
starts.
5. The capacity of motor exceeds that of
inverter.
1. Check, take corrective actions,
and then reset.
2.Prolong acceleration/deceleration
time
3. Reduce setting value of torque
boost.
4. Set speed search start enabled or
start DC brake.
5. Replace with applicable motor
or inverter.
SOC
Stable
Overcurrent
HOU
Instantaneous
Overvoltage
1. Deceleration time is too short. The
motor regenerative energy is too much.
2. Power supply voltage is too high.
1. Prolong deceleration time.
2. Lower the power supply voltage
to the rated voltage.
SOU
Stable
Overvoltage
1. Voltage of power grid is too high.
1. Lower voltage to the rated
voltage.
SlU
Stable
Undervoltage
1. Input power phase loss.
2. Wiring terminal of input power is loose.
3. Voltage fluctuation of input power is
too big.
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.
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