Advanced Software Features
7 - 4
Modified: 9/17/08
MedWeld 4000 Operator’s Guide
M-032116 Programs #T03300, #T02300 and #T02400
Dynamic Current Windows
You can define a window of acceptable values for current. To define this
window, use the setup parameters: High Current Limit and Low Current
Limit.
These parameters, along with the Nominal C-Factor parameter, define
the acceptable range of current to expect. You can also override the
values in the setup parameters by inserting into the weld schedule
Function #84 (WINDOW: HI=+00% LO=00% C-FACTOR=000).
Function #84 defines a current limit window with high and low limit
values and a new nominal C-Factor. (Refer to the discussion of C-Factor
on page 7-1.)
The target current is determined by the firing mode used by the weld
function: %I or automatic current compensation. This calculation is
shown below:
AVC:
Target current
=
(%I programmed in Function #20 + stepper boost) x C-Factor
ACC:
Target current
=
A. programmed in Function #30 + stepper boost
Calculate the high and low current limits using this equation:
AVC Example
In this mode, the target value is determined by the following calculation:
Target current
=
%I in Function #20 + Stepper boost x C-factor
An example of how these calculations are used is shown below:
•
Function #20 is WELD 10 CY 50%I
•
Stepper Boost is 2%
•
C-Factor is 170
•
High Current Limit = 10%
•
Low Current Limit = 20%.
To determine the target current:
Limit = Target c Target current x
(
)
HI
or
LO Limit percentage
100 %
