Miller Electric Big 40 CAT manual Three-Phase Power Connection, Rear Of Panel

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

			. Place Process/Contactor switch
			in Electrode Hot - Stick position
			when using three−phase genera-
Single-Phase Power Connection	1	2	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 Power Connection

Y Close panel opening if no connections are made to generator.

AC	Single	Three
	Phase	Phase
Output
	1	3
Volts	120/240	240
Amps	50	36
KVA/KW	12	15
Frequency	60 Hz
Engine Speed	1850 RPM

Lead 42 connects to GROUND stud on front of unit.

Jumper 42 is connected to 90 at factory.

93

Three-Phase Generator Power

YStop engine.

YPower 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 12).

Remove generator power panel mounting screws. Tilt panel forward.

3 Lead 93

Remove plug before inserting leads. Reinstall bushing.

5

Rear Of Panel

914 Lead 92

5 Lead 91

906 Lead 42 (Circuit Grounding Lead)

4	92	7	Lead 90 (Neutral)
		8	Isolated Neutral Terminal

6

7

9

8

91 92 93

240V

120V	1-Phase
120V
	240V
240V	3-Phase
	240V

3

2

12

10

11

Y Close panel opening if no connections are made to generator.

Tools Needed:

9Jumper Lead 42

10Grounding 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.

11User-Supplied Leads

12Circuit 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.

Ref. 197 399 / 802 332-E

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