User Manual

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 , 05VDC, 010VDC or 420mA 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 AB representative for application assistance.
Are Parameters 4244 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 AB representative for application assistance.