Lenze MC3000 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
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
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 .
8 ACCEL (ACCELERATION TIME)
ACCEL sets the acceleration rate for all speed reference sources (keypad, speed pot, 4-20
mA, 0-10 VDC, jog, and the preset speeds) . The ACCEL setting is the time to accelerate
from 0 Hz to the BASE FREQUENCY (Parameter 18) . The range of adjustment for ACCEL
depends on horsepower . Refer to the table below:
ACCELERATION LIMITS
HORSEPOWER RANGE OF ADJUSTMENT
0 .25 - 20 0 .1 - 3600 SEC
25 - 60 0 .3 - 3600 SEC
Example: If ACCEL is set to 30 seconds, and the BASE FREQUENCY is set to 60
Hz, the drive will ramp from 0 Hz to 60 Hz in 30 seconds . This is a linear
function, therefore the drive would ramp up to 30 Hz in 15 seconds, etc .