Lenze MC1000 Series - Manual (Page 49)

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PRESET ACTIVATION
PRESET # TB - 13A TB - 13B TB - 13C
1 CLOSED OPEN OPEN
2 OPEN CLOSED OPEN
3 OPEN OPEN CLOSED
CLOSED CLOSED OPEN
4 CLOSED OPEN CLOSED
OPEN CLOSED CLOSED
NOTE: SPEED #4 is selected if any two of the three TB-13 terminals are closed
to TB-2.
5,6 SKIP #1 & #2 (SKIP SPEED #1 & #2)
7 BAND WID (SKIP BANDWIDTH)
These parameters are used to prevent the drive from operating continuously at critical
speeds, or frequencies, that cause excessive mechanical vibration of the driven
equipment. The SKIP SPEEDS (Parameters 5 and 6) and the SKIP BANDWIDTH
(Parameter 7) are used to define up to two speed avoidance ranges. The SKIP
SPEED settings define the starting point of the speed range that is to be avoided,
and the SKIP BANDWIDTH setting defines how far the speed range extends beyond
SKIP SPEED. Setting the SKIP SPEEDS to .00 Hz disables this function.
Example: The critical frequency is 21 Hz, and a bandwidth of 2 Hz is desired.
Therefore, set SKIP #1 to 20 Hz and set SKIP BANDWIDTH to 2 Hz. This results in
a speed range from 20 Hz to 22 Hz that the drive will not operate within continuously.
If the drive were operating at 25 Hz and then commanded to operate at a speed
within the range of avoidance, the drive would decelerate to 22 Hz and remain at
that frequency until commanded to 20 Hz or below. The drive would then decelerate
through the range of avoidance to the new frequency. Likewise, if the drive were
operating at 18 Hz, and then commanded to operate at a speed within the range of
avoidance, the drive would accelerate to 20 Hz and remain at that frequency until
commanded to a speed of 22 Hz or above. The drive would then accelerate through
the range of avoidance to the new frequency.