Weld Schedules
MedWeld 4000 Operator’s Guide
Modified: 9/17/08
4 - 3
M-032116 Programs #T03300, #T02300 and #T02400
List of Functions
NOTE:
Unless otherwise indicated, nn represents any two-digit number from
0 – 99. nnn is a 3-digit number from 0 – 999. Exceptions to this
convention will appear next to the function.
Delay Functions
Delay functions all have the same effect on the weld schedule: They
cause the control to wait for the number of cycles specified. (Different
names are assigned for describing the reasons for a delay.)
During these functions, weld current does not flow and I/O status is not
changed.
01
SQUEEZE nn CYCLES
02
COOL nn CYCLES
03
HOLD nn CYCLES
04
OFF nn CYCLES
05
INITIAL SQUEEZE nn CYCLES
07
WAIT nn CYCLES
Weld Functions and
Firing Modes
Weld functions
provide a specified amount of weld current for the
number of cycles programmed. The function selected also selects the
type of firing mode desired.
The weld function you select also tells the weld processor the type of
firing mode to use to control the energy provided to a weld. Specify
weld current as either
•
A percentage of maximum available current, or
•
The amount of secondary current.
This function tells the control how to compensate for changes in the
welding environment:
•
AC operation: %I
uses a feature called
Automatic Voltage
Compensation
. AVC monitors
primary voltage
, using a nominal
voltage reference point (programmed in the setup parameters) to
determine when compensation is required for voltage swings on the
weld bus. This method does NOT compensate for changes in the
welder secondary circuit.
•
AC operation: Automatic Current Compensation.
ACC monitors
the
current
during each cycle. It compensates for changes detected
during the next cycle, to maintain secondary current at the level
programmed.
