VYPER
™
VARIABLE SPEED DRIVE
OPERATION
100.200-IOM (SEP 13)
Page 51
The trim pot is located on the Vyper
™
Logic board which is
mounted in the center of the right cabinet door. See Figure
49. The trim potentiometer (trim pot) is a small blue rect-
angular component located on the left side of the Vyper
™
Logic board. See Figure 59. The trim pot can be adjusted by
a small straight screw driver.
Figure 59 - Location of Trim Pot on Logic Board
Once the trim pot is located, the calibration can be viewed
by performing the steps shown on the next page on the
Quantum
™
LX panel screen.
Access the Vyper
™
Level 2 screen, described previously, as
shown in Figure 60.
The trim pot on the Vyper
™
Logic board must be adjusted
to represent the Job FLA based on the guidelines in Table C.
With a small, flat screw driver, rotate the
trim pot control until
the desired Job FLA setting is achieved. The Quantum
™
LX
screen will provide feedback to the operator as the adjust-
ment is made. Close the Vyper
™
cabinet and secure with
the door latches.
Once the Job FLA is set the installation of the drive should
be complete.
NOTICE
If Logic Board is replaced, the Job FLA must be reset to
the proper value using the Job FLA Trim Pot.
Tables C and D: Job FLA Calculation
Table C: Limit Calculations
Line
Parameter
Value
1
“Applied Motor FLA” *
2
Motor Service Factor
1.15
3
Multiply Line 1 x Line 2
4
HP Rating of Vyper Drive
5
Vyper Amp Limit
If Line 4 is 305 / 254 HP, Value is 380 A
If Line 4 is 437 / 362 HP, Value is 565 A
6
Multiply Line 5 x 1.05
* See SETTING THE MOTOR SCREEN section
Table D: Job FLA Calculation
If in Table C
Job FLA
Line 3 is Less than Line 6
= Line 3
Line 3 is greater than Line 6
= Line 5
Adjust the trim pot on the Vyper
™
Logic board until the Job
FLA is identical to the value calculated in Table D.
Figure 60 - Vyper
™
Level 2 Screen