Tweco HMC-410 - Manual (Page 36)

HMC-410
2-18 July 27, 2005
Controller PCB Assembly
(Refer to Figure 2-8)
The Controller PCB Assembly (controller) is the main
control for the panel. It collects all of the data from the
various controls and interfaces and provides control
stimuli to all of the equipment under its control. This board
has five receptacles on it to interface with the other
systems. It also has two connectors which allow
expandability for future enhancements.
At the heart of the controller board is a Signetics 80C552
Microcontroller designed specifically for harsh
environments such as automotive and industrial
applications. This microcontroller, and its associated
software, drive the HMC-410 to perform its activities like
timing, conversion of voltages and currents to digital data
to be displayed by the C/D board, and the conversion of
programmed data into voltages used by the power source
and PS/MC board.
The controller interfaces with the C/D board presenting
data for display and collecting control switch states. The
controller interfaces with the PS/MC board by receiving
power from that board, and supplying control stimuli to
the motor control circuitry.
The controller also interfaces with the interface/
suppressor board. It sends relay closures to the interface/
suppressor board for use on the auxiliary interface, power
source, and gas valve. This interface supplies external
control switch states, arc voltage, arc current, and tach
information to the controller.
Refer to Figure 2-8 for the following descriptions of the
controller board’s test points, jumpers, and DIP switch.
Controller Board Software
The controller may have optional software installed
onto it. This software can be installed in the field. The
software may be ordered as a 171238- dash number)
kit. Refer to the Options chapter for more information
on these software options.
Care must be exercised when ordering replacement
controller boards for systems that have had optional
software installed. New controller boards ordered from
the factory will ship with the standard software installed
onto it. When replacing (or maintenance stocking), please
verify that this board also has the appropriate software
kit installed onto it.
Controller Board Test Points
(Refer to Figure 2-8)
This board was designed to survive in an industrial,
electrically noise heavy environment. There are several
test points on the board, but are typically only used for
initial test and calibrations of the board. The test points
are included here only as a reference.
TP1 Signal Common
TP2 Wire Feed Speed Control Voltage
TP3 +5 VDC
TP4 +10 VDC
TP5 WFS Tach Input
TP6 Power Source Control Voltage
TP7 Arc Current 5 VDC
TP8 Power Source Signature
TP9 Arc Voltage
TP10 +4.4 VDC
TP11 Arc Current
Controller Board Jumpers
(Refer to Figure 2-8)
There are three jumpers on the controller board. The
jumpers are used to configure the board for various
products that this panel may be used with. Jumper JP2
is used to select power source control voltage polarity.
Refer to System Configuration located in the Operation
chapter for power source compatibility. Jumper JP3 and
JP4 are used for voltage feedback. Refer to System
Configuration located in the Operation chapter for power
source compatibility.