EM330D User Manual
A Special Purpose Inverter for Hoisting
91
9 Troubleshootings
9.1
Faults
When anything unexpected happens, the corresponding trip code and parameters will be
displayed on the keypad, fault relay acts, and 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 EM330D Fault trips and troubleshootings.
Table 9-1 EM330D Fault Trips and Troubleshootings
Trip
Code
Trip
Cause
Corrective Action
SC
Short
Circuit/EMC
Fault
1. Short circuit between inverter output
phases, or between the output phases and
ground.
2. IGBT is damaged.
3.On-site interference
1. Check whether there is a short
circuit.
2. Check, take corrective actions,
and then reset.
3. Technical support 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 drive 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. Setting speed search enabled
or start DC brake.
5. Replace with applicable motor
or inverter.
SOC
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. Use applicable braking unit
and braking resistor.
3. Lower the power supply
voltage to the rated voltage.
SOU
Stable
Overvoltage
1. Voltage of power grid is too high.
2. Decerlation time is too short.
1. Lower voltage to the rated
voltage.
2. Prolong the deceleration time.
SlU
Stable
Undervoltage/
SOFT Start
Failure
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
