Connecting To Optional Three-Phase Generator (Cc/Cv Models Only) - Miller Electric Big Blue 500D Owner's Manual

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

Single-Phase Power Connection
Three-Phase Power Connection
Remove plug
before inserting
leads. Reinstall
bushing.
5
6
7
9
8
1 2
!
Close panel opening
if no connections are
made to generator.
Lead 42 connects to GROUND stud on
front of unit.
Jumper 42 is connected to 90 at factory.
Rear Of Panel
91 92 93
240V
120V 1-Phase
120V
240V
3-Phase
240V
240V
Single Three
AC
Phase Phase
Output
1 3
Volts 120/240 240
Amps 50 48
KVA/KW 12 20
Frequency 60 Hz
Engine Speed 1850 RPM
4
3
2
12
10
11
!
Close panel
opening if no
connections
are made to
generator.
Tools Needed:
.
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 Supplementary Protector CB7
CB7 protects single-phase recep-
tacle 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
!
Stop engine.
!
Power and weld outputs are
live at the same time. Discon-
nect or insulate
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.
93
3 Lead 93
91
4 Lead 92
5 Lead 91
90
6 Lead 42 (Circuit Grounding
Lead)
92
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.
.
CB7 protects single-phase re-
ceptacle 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-B / 803 655
OM-4428 Page 39
unused