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TABLE OF CONTENTS-THEORY OF OPERATION SECTION
E-1 E-1
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC
DC-600
TheoryofOperation .....................................................................E-1
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-2
Input Circuit and Main Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-2
Control Circuit, Firing Circuit and Rectifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-3
Protective Devices and Shutdown Circuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-4
SCR Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-5
FIGURE E.1 BLOCK LOGIC DIAGRAM
CONTROL
TRANSFORMER
R
E
C
O
N
N
E
C
T
CONTACTOR
FAULT PROTECTION
115VAC
MAIN
TRANSFORMER
CONTROL
BOARD
SHUNT
OUTPUT
CONTROL
MODE
SWITCH
POSITIVE
TERMINAL
NEGATIVE
TERMINAL
LATCHING
RESISTOR
F
E
E
D
B
A
C
K
F
E
E
D
B
A
C
K
SCR BRIDGE
115VAC
42VAC
T
E
R
M
I
N
A
L
S
T
R
I
P
FIRING
BOARD
CR2
CR1
CHOKE
14-pin
Amphenol
115VAC
Receptacle
Fan
Motor
32VAC
32VAC
32VAC
SIGNAL
G
A
T
E
S
I
G
N
A
L
OUTPUT
CONTROL
Secondary
Thermostat
Primary
Theromstat
1CRCoil
w
Pilot
Light
•
•
OUTPUT
TERMINAL
SWITCH
POWER
SWITCH
•
TERMINAL
STRIP 1
OUTPUT
CONTROL
SWITCH
2
115VAC