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Principles of Operation
Teledyne API
– T200 NO/NO2/NOx Analyzer Operation Manual
310
13.3.4. RELAY PCA
The CPU issues commands via a series of relays and switches located on a separate
printed circuit assembly, called the relay PCA (Figure 13-13), to control the function of
key electromechanical devices such as heaters and valves. The relay PCA receives
instructions in the form of digital signals over the I
2
C bus, interprets these digital
instructions and activates its various switches and relays appropriately.
The relay PCA is located in the right-rear quadrant of the analyzer and is mounted
vertically on the backside of the same bracket as the instrument‟s DC power supplies.
Power
Connection
for DC
Heaters
Status LED’s
(D2 through D16)
DC Power Supply
Test Points
Watchdog
Status LED (D1)
(JP5)
Thermocouple
Configuration
Jumpers
Thermocouple
Signal Output
I
2
C
Connector
Valve Control
Drivers
Pump Power
Output
Pump AC
Configuration
Jumper
AC Power
IN
DC Power
Distribution
Connectors
Valve Control
Connector
TC1 Input
NO
2
NO Converter
Temp Sensor
Connector for
AC Relays
K1 & K2
Connector for AC Relays K4 & K5
Heater AC Power
Configuration
Jumpers
JP2
JP6
J15
J16
R16
J17
J2
JP7
J18
TP1
TP2
TP3
T
P4
TP5
TP6
TP7
J21
J19
J14
U5
U6
J4
J12
J11
J10
J9
J8
J7
J5
J13
J3
AC Relay K1
(Reaction Cell Heater)
AC Relay K2
(NO
2
NO Converter Heater)
AC Relay K4
(OPT Internal Span Gen Heater)
Figure 13-13: Relay PCA Layout (P/N 045230100)
CAUTION
E
LECTRICAL
S
HOCK
H
AZARD
Only those relays actually required by the configuration of the T200 are populated.
A protective retainer plate is installed over the ac power relay to keep them securely
seated in their sockets and prevent accidental contact with those sockets that are not
populated see Figure 13-14).
Never remove this retainer while the instrument is plugged in and turned on. The
contacts of the AC relay sockets beneath the shield carry high AC voltages even
when no relays are present.
06858E DCN7057
Содержание T200
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