Miller Electric Big Blue 402D User Manual

Page 49

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8-2. Connecting To Optional Three-Phase Generator (CC/CV Standard Models Only)

Ref. 197 399 / 802 332-B

.

Place Process/Contactor switch
in Electrode Hot - Stick position
when using three-phase genera-
tor (see Section 7-3
).

Single-Phase Generator Power
1

120/240 V 50 A Receptacle

RC5

RC5 is connected to the optional

three-phase generator and supplies

60 Hz single-phase power at weld/

power speed. Maximum output from

RC5 is 12 kVA/kW. Power available

at RC5 is reduced when welding.
2

Circuit Breaker CB7

Circuit breaker CB7 protects single-

phase receptacle RC5 and the load

wires from overload. If CB7 opens, all

three-phase generator output stops

and the receptacle does not work.
Three-Phase Generator Power
Y Stop engine.
Y Power and weld outputs are

live at the same time. Discon-

nect or insulate unused

cables.

.

Have qualified person install ac-
cording to circuit diagram and
Generator Power Guidelines
(see Section 14
).

Remove generator power panel

mounting screws. Tilt panel forward.
3

Lead 93

4

Lead 92

5

Lead 91

6

Lead 42 (Circuit Grounding

Lead)

7

Lead 90 (Neutral)

8

Isolated Neutral Terminal

9

Jumper Lead 42

10 Grounding Terminal
Jumper 42 is connected to lead 90 at

factory. Jumper 42 may be discon-

nected from neutral to meet applica-

ble electrical codes.
Lead 42 connects to front panel

Ground stud.
11 User-Supplied Leads
12 Circuit Breaker CB7 User

Terminals

Connect user-supplied leads to ter-

minals on CB7 and to the isolated

neutral terminal and grounding termi-

nal as necessary.

.

Circuit breaker CB7 protects
single-phase receptacle RC5
and the load wires from overload.
If CB7 opens, all three-phase
generator output stops and the
receptacle does not work.

Reinstall generator power panel.

Tools Needed:

Volts

Amps

KVA/KW

Single

120/240

50
12

Three

240

48
20

60 Hz

Frequency

Engine Speed

1850 RPM

AC

Phase

1

Phase

3

Output

Lead 42 connects to GROUND stud on

front of unit.
Jumper 42 is connected to 90 at factory.

1

2

91

92

93

240V

120V

120V

240V

240V

1-Phase

3-Phase

3

4

5

6

7

8

9

10

11

12

Rear Of Panel

Three-Phase Power Connection

2

Single-Phase Power Connection

92

90

91

93

Y Close panel opening

if no connections are

made to generator.

Y Close panel

opening if no

connections

are made to

generator.

240V

Remove plug
before inserting
leads. Reinstall
bushing.

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