Promac SY-350V Operating Instructions Manual page 22

13.2 Troubleshooting the inverter
Prior to operating all electronic parts, the following aspects should be taken into consideration first
Only eligible and qualified personnel can make electronic adjustments.
Note:
Disconnect machine from power supply.
Electronic parts are extremely sensitive, do not use hands or metal tools to remove or install such parts.
As remaining voltage still exists in the capacitor even after the electric current has been cut off, wait until the light disappears
from the lighted display completely before proceeding with any work to prevent any accidents or hazards from occurring.
Pay close attention to the electronic circuit board so that they are free from any defects.
Never connect the alternating current directly to the output connector (U/V/W) of the speed adjuster. The electronic self-
diagnosis program can notify you of situations like motor overloading and too low or too high voltage, etc. When the program
detects an error, the machine will stop immediately and such error will be displayed on the inverter's digital display. Follow the
solutions to correct any errors. Close the electrical cabinet and connect machine to power supply.
Wait 5 seconds after a fault has been cleared before performing reset via keypad of input terminal.
Fault Name Fault Descriptions
Over current
Abnormal increase in current
Over voltage
The DC bus votage has
exceeded ist maximum
allowable value.
Corrective Actions
1. Check if motor power corresponds
with the AC motor drive output powe. r
2. Check the wiring connections to
U/T1, V1T2, W/T3 for possible short
circuits.
3...Check the wiring connections between
the AC motor drive and motor for possible short
circuits, also to ground.
4. Check for loose contacts between AC
motor drive and motor.
5. Increase the Acceleration Time.
6. Check for possible excessive loading
conditions at the motor
7. If there are still any abnormal conditions
When operating the AC motor drive after a
short-circuit is removed and the other
ponts above are checked, it should be sent
back tot he maufacturer.
1. Check it the input voltage falls within the
rated AC motor drive input voltage range.
2. Check for possible voltage transients.
3. DC bus over-voltage may also be caused
by motor regeneration. Either increase the
Decel. Time or add an optional brake
resistor (and brake unit).
4. Check whether the required brake power is
within the specified limits.
.
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