Ⅵ. Trouble Shooting; Alarm And Corrective Measures - Savch S900 Series User Manual

Ⅵ. TROUBLE SHOOTING
Inverter is provided with functions of warning and protection such as over voltage, low voltage and over current.
Once fault occurs, protection function shall act, inverter output stops, fault contactor act and also free running of
motor shall stop. For causes and corrective measures of fault, display of fault shall be taken for reference. Fault
records shall be stored into computer memory inside AC motor drive (fault records for recent six times shall be
available), and records shall be read at digital control keypad.
Attention shall be paid that, pressing RESET after fault shall only be available after fault has been eliminated.

1. ALARM AND CORRECTIVE MEASURES

Display Descriptions of fault
Inverter detects over current at
output side.
Inverter detects over voltage at DC
high voltage side.
Inverter detects over heat,
exceeding protection level.
DC high voltage side over low
inside inverter.
Output current exceeds allowable
current of inverter. 60sec shall be in
station if 150% of rated current of
AC motor drive is output.
Inner electric relay protection acts
Corrective measures
1. Check rated current of motor complies with that of inverter.
2. Check that there is no short circuit in U, V, and W.
3. Check that no short circuit or grounding occur to connection
of motor.
4. Check that screws are securely tightened to AC motor drive.
5. Increase acceleration time (1-09, 1-11).
6. Check there is no over load to motor.
1. Check input voltage is within rated voltage range of inverter,
and see that no voltage surge occurs.
2. If over voltage occurs at DC high voltage side of inverter
caused by inertia back up voltage, deceleration time shall be
increased.
1. Check that ambient environment is not over heat.
2. Check radiator and air fan is running.
3. Check enough clearance for air flowing is provided to
inverter is with.
1. Check power supply voltage is correct.
2. Check no sudden heavy load.
1. Check motor over load.
2. Decrease torque (7-02 ) to improve set value.
3. Increase output capacity of AC motor drive.
1. Check motor over load.
2. Check rated current (07-00) of motor is proper.
3. Check electric relay function setting
4. Increase motor capacity.
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