Specifications

The following table shows how each preset speed is selected using the TB-13 terminals. The

terms OPEN and CLOSED refer to the state of the TB-13 terminal relative 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

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.

PRESET SPEED ACTIVATION

SPEED # 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