LEESON SM-Basic Series Sub-Micro Inverters (Obsolete) - Manual (Page 37)

33
NOTE 2: When a TB-13 terminal is programmed for a function other than a preset speed select, it is
considered OPEN for the table above.
Preset Speed #6 and #7 can also be used as skip frequencies to restrict the drive from operating at
frequencies that cause vibration in the system. See Parameter 38 below.
38 SKIP BANDWIDTH
The SM-Basic drive has two skip frequencies that can be used to lock out critical frequencies that
cause mechanical resonance in the system. Once SKIP BANDWIDTH is set to a value other
than 0 Hz, the skip frequencies are enabled. When the skip frequency function is enabled,
PRESET SPEED #6 and #7 are used as the skip frequencies. SKIP BANDWIDTH sets the range
above the skip frequencies that the drive will not operate within.
Example: The critical frequency is 23 Hz, and it is desired to skip a frequency range of 3 Hz above
and below the critical frequency (therefore the skip range is 20 to 26 Hz). PRESET SPEED #6 or #7
would be set to 20 Hz, and the SKIP BANDWIDTH would be set to 6 Hz.
If the drive is running at a speed below the skip range, and it is given a speed command that is within
the skip range, the drive will accelerate to the start of the skip range (20 Hz in the example) and run
at that speed until the speed command is greater than or equal to the "top" of the skip range. The
drive will then accelerate through the skip range to the new speed. Likewise, if the drive is running
at a speed above the skip range, and it is given a speed command that is within the skip range, the
drive will decelerate to the "top" of the skip range (26 Hz in the example) and run at that speed until
the speed command is less than or equal to the "bottom" of the skip range. The drive will then
decelerate through the skip range to the new speed.
NOTE: PRESET SPEEDS #6 and #7 can still be used as preset speeds even if they are also being
used as skip frequencies.
42 ACCEL / DECEL #2
This parameter sets the second acceleration and deceleration rate of the drive, which can be activated
using terminals TB-13A, 13B, or 13C (Parameter 10, 11, or 12). This parameter is affected by the
setting of TIME RANGE SELECT (Parameter 18).
44 PASSWORD
This allows the PASSWORD to be changed to any number between 00 and 99. Setting PASSWORD
to 00 disables the password function.
NOTE: The factory default password is 25.
47 CLEAR FAULT HISTORY
01 MAINTAIN: Maintains the FAULT HISTORY (Parameter 50) entries for troubleshooting.
02 CLEAR: Erases the FAULT HISTORY (Parameter 50) entries.