Miller Electric OM-842 manual User Relay Contacts, Pulse signal, and for a wire feeder

2-3. User Relay Contacts

1

4

The internal control relay contacts accessible through terminal strips 3T and 4T are rated at 20 amperes, 250 volts.

2 3

A B C

D E F

G H J

K L M

N

P

R S T

U V W

X Y Z

AA BB CC

WELD

INITIAL TIME INITIAL SLOPE WELD PEAK FINAL SLOPE

TIME

FINAL TIME

POST FLOW PULSE SIGNAL WIRE FEED

CONTACTS

S-157 815

Tools Needed:

Or

Ref. ST-162 477-A / ST-162 841 / Ref. SC-159 862

1 Access Door

Access door is hinged at top, and held closed with industrial interlock strips. To open, grasp bottom and pull out firmly.

2Terminal Strip 3T

3Terminal Strip 4T

4Connection Label

Use 3T and 4T to connect external equip- ment to internal relay contacts. Pairs of nor- mally closed and normally open contacts are provided for each weld sequence step, the

pulse signal, and for a wire feeder.

Each set of weld sequence contacts changes state at the beginning of the match- ing part of the weld sequence, and resets at the end of postflow. For example, the initial slope contacts change state when initial slope begins, and reset at the end of post- flow. The user relay contacts change state regardless of the time value programmed for the matching portion of the weld sequence. If 0.0 seconds was entered as a time value for final slope, the user relay contacts match- ing final slope and final current would change states at the same time.

The pulse signal contacts change state as pulsed output goes between peak and back- ground amperage.

The wire feed contacts operation is program- mable, and is explained where needed in Section 5.

To make connections, route leads through openings in either side of access door, and make connections to terminals according to the connection label.

Close access door.

OM-842 Page 10