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Continued from previous page Section B.
14
Output
Arc Length Control Lockout Reference = Paired with Pin 13. Connect to user's external voltage supply common (See
Section 5-5 for typical application).
15
Input
Memory Select = Used to select between memory numbers. Used in conjunction with pin 10 and 16. (See Sections 5-7
and 14-1.)
16
Input
Memory Select = Used to select between memory numbers. Used in conjunction with pin 10 and 15. (See Sections 5-7
and 14-1.)
17
Input
Amperage Control = 0 to +10 volts DC with respect to pin 11. The 10 volts represents the amperage value set on ma-
chines meter. (Pin E of 14 pin)
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.
20
Input
Welder Control Select = Connect to pin 8 to activate this mode.
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.
C. User Controlled Automation Mode (Pin 25 Connected To Pin 8) Automation 2
This mode includes all the basic functions of the automation board, plus gives the welder the option to control the pulse or AC waveforms, or to minimize
the noise that can be injected into the welder from the control and cables. These functions include Start/Stop, Valid Arc Indication, Gas Control, High
Frequency Arc Start Disable, and Emergency weld stop.
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/respect to pin 11.
6
Output
Scaled Actual Welding Amperage = +1 volt DC per 100 amperes of output w/respect 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.)
Continued on next page
OM-275857 Page 24
.
A complete Parts List is available at www.MillerWelds.com
2
1
6
5
4
9
10
15
17
16
22
21
26
Pin Information For 28-Pin Receptacle RC28
804746-B / 21816-A
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Table of Contents
Troubleshooting
