Section 8 - Theory Of Operation - Red-D-Arc D502K 5+4 Technical Manual

SECTION 8 – THEORY OF OPERATION
1 Engine
Supplies force to turn revolving
fields.
2 Control Relays CR2, CR5
CR2 energizes at start-up to supply
power to the fuel solenoid.
CR5 energizes at start-up to supply
power to PC1.
3 Main/Exciter Revolving Fields
Turn at 1850 rpm maximum for weld
and power. The speed and excitation
current of the field coils determine
voltages in stator windings.
4 Stator Windings
Supply power to exciter, auxiliary
power, and weld circuits.
5 Fuses F1, F2
Protect aux. stator (exciter) windings
from overload.
6 Integrated Rectifier SR1
Changes ac output of stator windings
to dc to supply excitation current to
the exciter revolving field.
7 Voltage/Amperage Adjust
Control R1
Adjusts voltage/amperage within
range selected by S3.
8 Field Current Regulator Board
PC1
Adjust weld output by changing re-
volving filed current after comparing
feedback to voltage/amperage set-
ting of R1.
9 LED Board PC9
Monitors power, remote control,
command, engine rpm, and field ex-
citation inputs to PC1.
10 Circuit Breakers CB5, CB13
Protects PC6/RC14 from overload.
11 Filter Board PC6/Remote 14
Receptacle RC14
PC6 protects unit from high frequen-
cy and excess voltage caused by a
damaged remote control cable.
RC14 connects remote voltage/am-
perage and contactor control to unit.
12 Process/Contactor Control
Switch S6
Selects weld process and weld out-
put on/off control (Weld Terminals Al-
ways On or Weld Terminals Remote-
ly Controlled).
TM-4412 Page 30
11
Filter Board
PC6/Remote
Receptacle RC14
12
2
Control Relay
CR2
1 3
Revolving
Engine Fields
(Rotor)
Figure 10-1. Functional Diagram
10
Circuit
Breakers
CB5, CB13
13
Voltage/
Process/
Amperage
Contactor Switch S6
Adjust Control
Remote Electrode
Switch S5
Hot
7
Amperage
Control R1
2
Control Relay
6 5
Integrated
Rectifier
SR1
9
LED Board PC9
8
Voltage/
Field
Current
Adjust
Regulator
Board
PC1
CR5
5
Fuse F1 Fuse F2
4
Exciter
Stator Windings
Auxiliary Power
24
Transformer
T1
25
Integrated
Rectifiers
SR4, SR5
D502K 5+4