Teledyne 9110T instruction manual Relay PCA Layout P/N, Electrical Shock Hazard

Model 9110T NOx Analyzer Principles of Operation

13.3.3.8. Power-Up Circuit

This circuit monitors the +5V power supply during start-up and sets the analog outputs, external digital I/O ports, and I2C circuitry to specific values until the CPU boots and the instrument software can establish control.

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, 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 I2C 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.

Thermocouple

Signal Output

(JP5)

Thermocouple

Configuration

Jumpers

TC1 Input J15

NO2  NO Converter

Temp Sensor

J16

Pump AC

Configuration

Jumper

R16

Pump Power

Output

AC Power

IN

J2

Connector for

AC Relays

K1 & K2

	Status LED’s
	(D2 through D16)	Watchdog	DC Power Supply
		Status LED (D1)		Test Points
						I2C Connector
		TP1 TP2 TP3 TP4 TP5 TP6 TP7			J3
					J21
					J19	Power
					J14
						Connection
	J17	Heater AC Power		U6		for DC
		Configuration				Heaters
		Jumpers				Valve Control
	JP2			U5		Drivers
JP7			J12
		JP6	J11		J4
	AC Relay K4		J10			Valve Control
						Connector
(OPT Internal Span Gen Heater)				J5	J13
		J18	J9
			J8
	AC Relay K2
(NO2  NO Converter Heater)
			J7
	AC Relay K1
	(Reaction Cell Heater)
						DC Power
						Distribution
	Connector for AC Relays K4 & K5					Connectors

Figure 13-15: Relay PCA Layout (P/N 045230100)

CAUTION

ELECTRICAL SHOCK HAZARD

Only those relays actually required by the configuration of the 9110T are populated. A protective retainer plate is installed over the ac power relay to keep them securely

Teledyne Analytical Instruments 345