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Appendix B: 8LS-CP
8LS Users Guide 107
The 8LS-CP is not only ordered for the number of carbon input loops
desired, but the CPU DIP Switch on the CPU board must be set
correctly to reflect the number of carbon inputs.
The figure below presents a typical 8LS-CP control system.
Number of Carbon Loops
CPU DIP Switch
#7 #8
CP-1 Off Off
CP-2 Off On
CP-3 On Off
CP-4 On On
8 loop controller
Probe T/C
Carbon probe
Furnace/Generator
Furn T/C
Loop #1 Probe temperature input
Loop #2 Carbon input
T/C
Loop #3
Furnace temperature control
Furn heat control
Loop #1 or #3 PID primar
y
output
Reverse Action TP or analo
g
Gas valve
Atmosphere
Control
Loop #2 PID primar
y
output
Reverse action TP or analo
g
SSR
Rela
y
N.C.
Air valve
Atmosphere
Control
DAC
SSR
Air flow
re
g
ulator
N.C.
Probe
air
suppl
y
GAS
AIR
Burn -off
solenoid valve
To carbon probe
burn-off port
To carbon probe
reference port
Re
q
uires DAC for
analo
g
output
Loop #2 PID secondar
y
output
Direct Action TP onl
y
CP
g
as shut off valve.
Closed when loop #1 PV(1400 or PV>2400º
F.
1400-2400
CO+CO2: 1-30%
Alternate
must use di
g
ital
CP
g
as output
Generator
.
Connection
for
Temperature
Control
External
Hi
g
h limit
CP
trim
g
as
di
g
ital
output
Probe
Burn off
di
g
ital
output
Suppl
y
Suppl
y
120 VAC
Suppl
y
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