Relay Pca - Teledyne T200 Operation Manual

Principles of Operation

13.3.4. RELAY PCA

Thermocouple
Signal Output
(JP5)
Thermocouple
Configuration
Jumpers
TC1 Input
 NO Converter
NO
2
Temp Sensor
Pump AC
Configuration
Jumper
Pump Power
Output
AC Power
IN
Connector for
AC Relays
K1 & K2
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.
310
Teledyne API – T200 NO/NO2/NOx Analyzer Operation Manual
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
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.
Status LED's
(D2 through D16)
J15
J16
J17
JP2
JP7
R16
AC Relay K4
(OPT Internal Span Gen Heater)
J2
AC Relay K2
 NO Converter Heater)
(NO
2
AC Relay K1
(Reaction Cell Heater)
Connector for AC Relays K4 & K5
Figure 13-13: Relay PCA Layout (P/N 045230100)
Watchdog
Status LED (D1)
Heater AC Power
Configuration
Jumpers
J18
CAUTION
E S H
LECTRICAL HOCK
2
C bus, interprets these digital
DC Power Supply
Test Points
2
I C
J21
J19
Power
J14
Connection
for DC
Heaters
Valve Control
Drivers
J12
J4
J11
Valve Control
J10
Connector
J9
J8
J7
DC Power
Distribution
Connectors
AZARD
06858E DCN7057
Connector