Miller Electric Big Blue 500 PT, Owner'S Manual

Page: 43 / 90

OM-4429 Page 39
8-2. Connecting To Optional Three-Phase Generator (CC/CV Models Only)
Ref. 197 399 / 802 332-E / 803 655
Place Process/Contactor switch
in Weld Terminals Always On -
Stick position when using three-
phase generator (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 Supplementary Protector CB7
Supplementary protector CB7 pro-
tects single-phase receptacle RC5
and the load wires from overload. If
CB7 opens, all generator output
stops and the receptacle does not
work.
Three-Phase Generator Power
!
Stop engine.
!
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 12).
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 Supplementary Protector CB7
User Terminals
Connect user-supplied leads to ter-
minals on CB7 and to the isolated
neutral terminal and grounding termi-
nal as necessary.
Supplementary protector CB7
protects single-phase receptacle
RC5 and the load wires from
overload. If CB7 opens, all gener-
ator output stops and the recep-
tacle 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
Close panel opening
if no connections are
made to generator.
Close panel
opening if no
connections
are made to
generator.
240V
Remove plug
before inserting
leads. Reinstall
bushing.