Rockwell Automation 1333 Drive, 3/4-5HP, 230-575V Series D - Manual (Page 122)

Preventive Maintenance and
Troubleshooting Common Drive Problems
Appendix B
B-15
7. The drive will not decelerate to minimum speed -- No fault is displayed.
The priority used by the 1333 to limit minimum output frequency is:
1. For local speed control, use Parameter 50.
2 If an external potentiometer, 0Ć5VĂDC, 0Ć10VĂDC or 4Ć20mA signal is to
control drive speed, use the higher of the values set by Parameters 15
and 51.
Is Parameter 50 Lower Frequency Clamp set to a value higher than the
required minimum frequency?
Reset Parameter 50 to minimum frequency.
Yes
No
No
Yes
Contact your nearest AĆB representative for application assistance.
Are Parameters 42Ć44 Skip Frequencies 1, 2 and 3 and/or Parameter 45
programmed to exclude minimum frequency?
Reprogram Parameters 42, 43 and/or 44 to a value above minimum
frequency. Reprogram Parameter 45 to a bandwidth that will not include the
minimum frequency.
No
Yes
Is 0 output speed required at a 0 external input signal?
To program the drive for a directly proportional input signal, set Parameter 53
to the minimum frequency required and Parameter 54 to the maximum
frequency required.
8. An input line fuse has blown -- No fault is displayed.
Are the drive input fuses sized in accordance with the values given in Chapter
4 Installation and Wiring?
Replace with the correct fuses.
Yes
No
No
Are the drive input and output terminals wired as shown in Chapter 4
Installation and Wiring.
Wire as shown. Do the input fuses still blow?
Yes Yes
Contact your nearest AĆB representative for application assistance.