Rockwell Automation 1333 Drive, 3/4-5HP, 230-575V Series D - Manual (Page 108)

B
Appendix
B-1
Preventive Maintenance and
Troubleshooting Common Drive Problems
Preventive Maintenance
The Bulletin 1333 is convection cooled by air flowing through the heat
sink slots. The slots must never be allowed to become obstructed with dirt
or foreign matter. Periodically check and clean the heat sink slots.
Problems with Your Drive?
The following descriptions indicate the operation of protective circuitry in
Check the Following First
the Series D Bulletin 1333. What is thought to be a drive operational
problem, may in reality be normal protection circuit operation. Refer to the
following precheck procedures and Chapter 5 –– Operation and
Programming before attempting to troubleshoot your drive.
Precheck Procedures Acceleration Stall Protection -- No Fault is Displayed
The Reason During motor acceleration, if current exceeds 140% of rated
Drive current or 125% of Parameter 7, the overcurrent stall protection
circuit operates. In order to guard against currents in excess of these values
and prevent an overcurrent trip, this circuit temporarily stops drive
acceleration. When load current is again below these values, the circuit lets
the drive continue to accelerate to set frequency.
Precheck Procedure If the application does not require this function it can
be deactivated by setting Parameter 17 to 0.
Deceleration Stall Protection -- No Fault is Displayed
The Reason During motor deceleration, if current exceeds 140% of rated
Drive current or 125% of Parameter 7, the overcurrent stall protection
circuit operates. In order to guard against currents in excess of these values
and prevent an overcurrent trip, this circuit temporarily stops drive
deceleration. When load current is again below these values, the circuit lets
the drive continue to decelerate to set frequency.
Precheck Procedure Both Parameters 18 and 46 will protect the drive from
nuisance trips during motor deceleration. If the application does not
require this function it can be deactivated by setting Parameters 18 and/or
46 to 0.