WTC MedWeld 3005, Operator'S Manual

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With the RIO interface, the rack contains an RIO network
module. In addition, a combination I/O module provides
discrete (local) inputs and outputs for safety interlocks. See “RIO
Integration” on page 1-8.
The DeviceNet interface also requires a module in the control
rack and uses the Combination I/O module to provide discrete
(local) inputs and outputs for safety interlocks. This is described
in “DeviceNet Integration” on page 1-8.
When the control uses a discrete interface, the rack contains an
input module and an output module, described in “Discrete I/O
Modules” on page 1-13.
These advanced integration options add flexibility to the WTC
design, providing full-function and programming capabilities.
You can program 31 independent weld schedules, then assign a
weld schedule to one of 62 independent steppers (to compensate
for lost current density).
The control compensates for changes in the welding environment
by monitoring the voltage and increasing the current as required
to assure consistent welds. The primary current (I) changes as the
voltage fluctuates. For example, if E drops, the processor firing
phase shifts forward (to increase I) until E stabilizes.
You can program a weld function to use either Automatic Voltage
Compensation (to maintain a desired primary voltage) or
Automatic Current Compensation (to maintain constant
secondary current).
The MedWeld 3005 can perform the weld, delay, slope, pulsation
or timing functions that your application requires. Other features
allow control of outputs, and monitor the status of inputs.
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The MedWeld 3005 weld processor consists primarily of two
printed circuit boards: The weld processor and the firing card.
The weld processor is mounted in the chassis of an Allen-Bradley
programmable controller, to support the integration options.
Figure 1 on the facing page illustrates the weld control.