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Continued from previous page Section A.
18
Output
+10 volts DC with respect to pin 11 for use with an external potentiometer to vary the signal into pin 17 (Pin C of 14 pin).
19
Input
High Frequency Arc Start Disable = Disables the arc starter from being activated when connected to pin 8.
23
Output
Final Slope Sequence Indication = Paired with Pin 24. Pin is closed to pin 24 when in Final Slope. Electrical specifica-
tions: Open collector transistor maximum values 27 volts DC peak @ 75mA. (See Section 5-5 for typical application).
24
Output
Final Slope Sequence Indication Reference = Paired with pin 23. Connect to user's external voltage supply common.
(See Section 5-5 for typical application).
All other pins not used.
B. Welder Controlled Automation Mode (Pin 20 Connected To Pin 8) Automation 1
Use this mode when only the basic functions of the automation board are required, or if the welder needs to control the initial and final weld timers. These
functions include Start/Stop, Valid Arc Indication, Gas Control, High Frequency Arc Start Disable, Remote Memory Select, and Emergency weld stop.
The welding power source functions as a standard unit. Automation 2 mode should be used when an externally controlled pulse waveform is needed, or
if the welder's amperage is affected by noise injected into the cabling between the remote equipment and the welder.
3
8
7
13
14
12 11
18
19
20
24 23
25
27
28
Signal
Pin
Direction
1
Input
Start/Stop = Maintained connection to pin 8 starts the weld cycle. Opening connection stops weld cycle. For momentary
closure operation, set unit to 2T. A momentary closure greater than 100 ms, but less than 3/4 of a second starts and
stops weld output.
2
Input
Emergency Weld Stop = Used to remotely stop the weld outside the normal welding cycle (i.e. light curtains or external
E-Stop). Connection to pin 8 must be maintained at all times. If the connection is broken, output stops, Postflow begins,
and will be displayed on the meters.
3
Input
Gas Control = This input is used to control the gas flow outside the settings of the preflow and/or postflow set on the
machine. Connection to pin 8 turns on gas.
4
Output
Valid Arc Indication = Paired with Pin 9. This output is used to signal external fixtures that the machine has detected a
valid arc. Pin is closed to pin 9 when the output is on and there is less than 65 load volts. Electrical specifications: Open
collector transistor maximum values 27 volts DC peak @ 75mA. (See Section 5-5 for typical application).
5
Output
Scaled Actual Welding Voltage = +1 volt DC per 10 volts of output w/reference to pin 11.
6
Output
Scaled Actual Welding Amperage = +1 volt DC per 100 amperes of output w/reference to pin 11.
7
Output
+15 volts DC with respect to pin 11 (Pin A of 14 pin)
8
Output
Reference PIN= This pin is the signal reference for pins 1, 2, 3, 10, 15, 16
9
Output
Valid Arc Indication Reference = Paired with Pin 4. Connect to user's external voltage supply common. (See Section
5-5 for typical application).
10
Input
Memory Select = Used to select between memory numbers. Used in conjunction with pins 15 and 16. (See Sections 5-7
and 14-1.)
11
Output
Amperage Control Reference = for pins 5, 6, 7, 17 and 18. (Pin D of 14 pin)
12
Output
Welders Chassis = Earth ground. Connected only if common potentials are needed between user equipment and the
welder.
13
Output
Arc Length Control Lockout = Paired with Pin 14. Used to send signal to an automatic voltage control to ignore the
voltage during certain situations. Pin is closed to pin 14 when the weld cycle is in Initial Amperage, Initial Slope, Final
Slope, Final Amperage, and Pulsed Background time. Electrical specifications: Open collector transistor maximum val-
ues 27volts DC peak @ 75mA. (See Section 5-5 for typical application.)
Continued on next page
.
A complete Parts List is available at www.MillerWelds.com
2
1
6
5
4
9
10
17
16
15
22
21
26
Pin Information For 28-Pin Receptacle RC28
804746-B / 218716-A
OM-275857 Page 23
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Table of Contents
Troubleshooting
