IRIS P522 Instructions d'utilisation

FLAME MONITORING SYSTEM

MODEL P522 SIGNAL PROCESSOR

APPLICATION MANUAL

IRIS MODEL P522 APPLICATION MANUAL

Page 2

Table of Contents

IRIS MODEL P522 ---------------------------------------4

WIRING AND INSTALLATION------------------------4

FIGURE 1 - P522 REAR MOTHERBOARD-------4

WIRING TO THE PLUG-IN TERMINALS ----------5

WIRING OF VIEWING HEAD-------------------------6

FIGURE 2 - WIRING OF VIEWING HEAD --------6

FIGURE 3 - WIRING AND ASSEMBLY -

VIEWING HEAD --------------------------------------7

OPTIONAL LTA ADAPTER----------------------------7

POWER SUPPLY ----------------------------------------8

FIGURE 4 - POWER SUPPLY TABLE -------------9

FACTORY STOCKED POWER SUPPLIES-------9

REDUNDANT POWER SUPPLIES------------------9

SELF-CHECKING FUNCTION --------------------- 10

APPROVALS -------------------------------------------- 10

POWERING UP THE P522-------------------------- 10

SET POINTS -------------------------------------------- 11

FIGURE 5 - SET POINTS---------------------------- 11

CHANGING SET POINTS --------------------------- 11

FLAME FAILURE RESPONSE TIME (F.F.R.T.) 12

4-20mA REMOTE OUTPUT------------------------- 12

FIGURE 6 - REMOTE METER ANALOG OUTPUT 12

INSTALLATION OF VIEWING HEAD------------- 13

FIGURE 7 - VEWING HEAD CROSS-

REFERENCE TABLE---------------------------13

SIGHTING OF THE VIEWING HEAD------------- 13

MULTIBURNER REQUIREMENTS --------------- 14

FIGURE 8 - CUTOFF FREQUENCIES----------- 14

MULTIPLE VIEWING HEADS ---------------------- 14

DETERMINING SIGHT PIPE SIZE---------------- 15

SELECTING THE PIPE------------------------------- 15

MOUNTING HOLE------------------------------------- 15

MOUNTING OF SIGHT PIPE ----------------------- 15

INSTALLING THE VIEWING HEAD--------------- 15

PURGE AIR---------------------------------------------- 15

SETUP AND ADJUSTMENT PROCEDURES -- 16

SIGHTING ADJUSTMENT--------------------------- 16

INITIAL SETUP ----------------------------------------- 16

ADJUSTING SET POINTS -------------------------- 17

TROUBLESHOOTING GUIDE --------------------- 18

NOISE INTERFERENCE AND GROUNDING-- 18

S506 VIEWING HEAD -------------------------------- 19

S506 SELF-CHECKING VIEWING HEAD------- 20

S509 VIEWING HEAD -------------------------------- 20

S511 VIEWING HEAD -------------------------------- 21

S512 VIEWING HEAD -------------------------------- 21

ORIFICING----------------------------------------------- 23

FIGURE 9 - ORIFICING: SIGNAL-REDUCING

CHARACTERISTICS OF DISCS ---------------- 23

SIGNAL SOURCES ----------------------------------- 23

VIEWING HEAD - ANGLE OF VIEW------------- 24

FIGURE 10 - VIEWING HEAD: ANGLE OF VIEW

- DISTANCE AND DIAMETER ------------------- 25

APPLICATION OF IRIS VIEWING HEADS ----- 25

LOW NOx APPLICATIONS-------------------------- 26

APPLICATION OF P522 ----------------------------- 26

USING A PLC WITH IRIS FLAME MONITOR-- 26

FIGURE 11 - VIEWING HEAD APPLICATION

TABLES ------------------------------------------------ 27

FIGURE 11 - VIEWING HEAD APPLICATION

TABLES Cont’d--------------------------------------- 28

BASIC BURNER START CIRCUIT ---------------- 29

FIGURE 12 - BASIC BURNER START CIRCUIT 30

MODULE COMMUNICATIONS -------------------- 31

MODBUS COMMUNICATION ---------------------- 31

COMMUNICATING WITH MODICON PLC ----- 32

COMMUNICATION WITH HUMAN-INTERFACE

HOST COMPUTER --------------------------------- 32

RS-232 to RS-422 CONVERSION----------------- 32

SETTING ADDRESSES------------------------------ 32

TECHNICAL HELP------------------------------------- 33

FIGURE 13 - SPECIFICATIONS------------------- 34

FIGURE 14 - MODEL P522 FRONT PANEL --- 35

FIGURE 15 - MODEL P522 SIDE VIEW --------- 36

FIGURE 16 - S5XX VIEWING HEAD

DIMENSIONS ------------------------------------------- 36

FIGURE 17 - IR VIEWING HEAD LOCATION-- 37

FIGURE 18 - UV VIEWING HEAD LOCATION 37

FIGURE 19 - OPPOSED FIRED VIEWING

HEAD SIGHTING -------------------------------------- 38

FIGURE 20 - VIEWING HEAD MOUNTING ---- 38

INDEX ----------------------------------------------------- 39

IRIS MODEL P522 APPLICATION MANUAL

Page 3

Figure Index

FIGURE 1 - P522 REAR MOTHERBOARD--------------------------------------------------------------------4

FIGURE 2 - WIRING OF VIEWING HEAD ---------------------------------------------------------------------6

FIGURE 3 - WIRING AND ASSEMBLY - VIEWING HEAD ------------------------------------------------7

FIGURE 4 - POWER SUPPLY TABLE --------------------------------------------------------------------------9

FIGURE 5 - SET POINTS----------------------------------------------------------------------------------------- 11

FIGURE 6 - REMOTE METER ANALOG OUTPUT-------------------------------------------------------- 12

FIGURE 7 - VEWING HEAD CROSS-REFERENCE TABLE-------------------------------------------- 13

FIGURE 8 - CUTOFF FREQUENCIES------------------------------------------------------------------------ 14

FIGURE 9 - ORIFICING: SIGNAL-REDUCING CHARACTERISTICS OF DISCS ----------------- 23

FIGURE 10 - VIEWING HEAD: ANGLE OF VIEW - DISTANCE AND DIAMETER---------------- 25

FIGURE 11 - VIEWING HEAD APPLICATION TABLES-------------------------------------------------- 27

FIGURE 11 - VIEWING HEAD APPLICATION TABLES Cont’d ---------------------------------------- 28

FIGURE 12 - BASIC BURNER START CIRCUIT----------------------------------------------------------- 30

FIGURE 13 - SPECIFICATIONS-------------------------------------------------------------------------------- 34

FIGURE 14 - MODEL P522 FRONT PANEL ---------------------------------------------------------------- 35

FIGURE 15 - MODEL P522 SIDE VIEW ---------------------------------------------------------------------- 36

FIGURE 16 - S5XX VIEWING HEAD DIMENSIONS ------------------------------------------------------ 36

FIGURE 17 - IR VIEWING HEAD LOCATION--------------------------------------------------------------- 37

FIGURE 18 - UV VIEWING HEAD LOCATION ------------------------------------------------------------- 37

FIGURE 19 - OPPOSED FIRED VIEWING HEAD SIGHTING------------------------------------------ 38

FIGURE 20 - VIEWING HEAD MOUNTING ----------------------------------------------------------------- 38

IRIS MODEL P522 APPLICATION MANUAL

Page 4

IRIS MODEL P522

The P520 and P522 Signal Processors are used with

the IRIS Model 500 Viewing Heads. The P522

Signal Processor is a relay panel mount ver-

sion of the P520 plug-in module, and replaces the

M502 motherboard and its two plug-in daughter

boards, the A513 and the D504.

WIRING AND INSTALLATION

Before wiring or installing the P522, we recommend

thatyou readthe companion colourbrochure describ-

ing the functions and attributes of this series of sig-

nal processors.

.75A

GND +26V BAT

SC C

SC OFF

SC ON

RELAY

RF C

RF OFF

RF ON

RF C

RF OFF

RF ON

RELAY

.25A

+26V

SIG

GND SIG

0-20mA or

4-20mA

VH SEL

RELAY

CHAN

SELECT

ANALOG

CURRENT

DRIVE

RS-422

SHUTTER

DRIVE

+TX

-TX

+RX

-RX

RMT

METERCHAN

SEL V.H.

SEL V.H.A. V.H.B.

GND

++--+

SIG

GND

SIG

GND

SIG

GND

SIG

GND

FIGURE 1 - P522 REAR MOTHERBOARD

IRIS MODEL P522 APPLICATION MANUAL

Page 5

WIRINGTOTHE PLUG-IN TERMINALS

Figure1illustratestheplug-interminalsontherearmother

board and how they are connected internally. The flame

relayandself-checkingrelaycontactsaresituatedtogether

in the upper right portion of the diagram.

RF C refers to the common terminal of the flame relay,

with ON being flame on, and OFF being flame off. You

will note that there are two sets of contacts used for the

flame relay.

SCC refersto thecommonterminal oftheself-check-

ing relay. There is only one pair of contacts used

for the self-checking function. Here, the designa-

tion ON refers to the self-checking taking place in a

normal manner. OFF indicates a failure in the view-

ing head or processor resulting from:

- the hardware (i.e. the shutter mechanism in

the viewing head, or the output relay itself);

- electronic components anywhere, or

internal software in the P522; or

- the power to the unit is OFF – the most

likely condition.

The main power feeds in through the terminals situ-

atedonthe upperleftside (seeGND,+26V andBAT).

Eachdesignated terminalis adouble terminal,or pair,

sothat thewiringfrom thepowersupply canbe “daisy

chained”from one P522 tothe next withouthaving to

twist wires together into one termination.

The pair designated BAT is for battery backup, if

used. Note the rectifier used internally to prevent

the 26 VDC main power supply from feeding into

the battery. The backup battery, if used, should be

24 volts, to ensure that the 26 VDC power feeding

the P522 will not feed back into the battery. In other

words, no current will flow from the battery as long

as voltage of the main power supply is above that of

the battery. The negative side of the battery goes to

the GND terminal on the left.

Figure 1 shows how these terminals are connected

inside the P522. Note the two fuses marked F1 and

F2. F1 is the main power fuse for the signal proces-

sor as well as the viewing head(s), and is rated at .75

Amp. Fuse F2 feeds only to the viewing head(s),

and is rated at .25 Amp. On newer units (those with

NO, CAL, and YES in red letters on the front panel)

these fuses are self-resetting types, and will recover

from an overload automatically after power is re-

moved from the P522 for 10 seconds.

The viewing head terminals (bottom right) are iden-

tified as V.H. A. and V.H. B. If only one viewing

head is used, you must wire to the V.H. A. termi-

nals. To the left of the viewing head terminals are

two terminals marked V.H. SEL (viewing head se-

lector relay). Energizing this connection with 19 to

38 VDC will cause the relay on this PC board to

switch to viewing head B. The nominal voltage of

this relay is 24V, but the 26 VDC power circuit can

be used to switch this relay, if desired.

Only the viewing head signal wire (SIG) and the sig-

nal ground wire (SIG GND) are switched with this

changeover relay; the 26 VDC and power ground

circuit is not disturbed. Make sure that the viewing

head signal wire and signal ground (braided shield

in the four-conductor cable) are both connected, be-

cause this ground connection is the only return path

for the signal and self-checking circuit. Also, the 26

VDC used to switch this relay must be connected

with the proper polarity, because the relay used is a

single-side stable type. (Relays that are polarized

magnetically offer increased contact force resulting

in higher current-carrying capability). The two ter-

minalsmarked V.H. SELgo directly tothe relay coil.

The pair of terminals designated CHAN SEL (to the

left of the V.H. SEL terminals) is used for selecting

channel A or channel B on the P522. Energizing

this pair of terminals causes the B channel to be se-

lected. Polarity must be observed when wiring this

connection (the positive terminal is on the right).

This is an isolated input, so two wires are required.

Any DC voltage from 7.5 to 30 may be used. The

current required will depend upon the voltage, be-

cause this is a photocoupler interface circuit with a

3900 ohm resistor feeding the LED light source.

For example: a 26 VDC voltage will result

in a current flow of 25/3900 = .0064 Amp.

If flame is being detected and the channels are

switched, the flame relay will remain energized for

IRIS MODEL P522 APPLICATION MANUAL

Page 6

one cycle regardless of the new set points, allowing

channel changes “on the fly,” so to speak. If the

new flame OFF set point is equal to or greater than

the current signal count, then the flame relay will

de-energize on the subsequent cycle.

The pair of terminals designated RMT METER (to

theleft of the CHANSEL terminals) isfor the remote

meterconnection. This outputis acurrent-driven sig-

nal that ranges from 0 to 20 mA for remote meters,

and can be switched to a range of 4 to 20 mA for DCS

(distributed controlsystem)applications(refer to sec-

tion 4-20mA REMOTE OUTPUT). Connect the

terminal marked “positive” to the positive meter ter-

minal. This current signal can be used with a volt

meter by feeding the signal to a resistor connected to

the ground. The voltage developed across the resis-

tor will follow Ohm’s law V = IR.

For example: a 3-volt meter can be used

witha resistorof 3/.02= 150ohms, which

willresult ina full-scalereading of3 volts

for a 20mA output.

The four terminals called +TX, -TX, +RX, and -RX

(to the left of RMT METER terminals) are used for

the serial communication link. The serial commu-

nication is achieved by using ASCII character code

transmission at 4800 or 9600 baud through the RS-

232 com ports on the host computer. The P522 uses

RS-422 data transmission which is over two, twisted

pairs that are differentially transmitted and received,

allowing long wire runs to be used through noisy

environments. AnRS-232 to RS-422converter must

be used to communicate with the P522, and the con-

nections are made to the terminals marked +TX, -

TX, +RX and -RX. The transmitting, twisted pair

goes to the TX terminals, and the receiving, twisted

pair goes to the RX terminals.

Note: the terms “transmit” and “receive” used here

with respect to the P522 will be reversed with re-

spectto the RS-232connection on the host computer.

Refer to later sections in this manual for a detailed

description of the software and how it is to be used

with the P522.

WIRING OF VIEWING HEAD

Wiring of the viewing head is made to the terminals

on the lower right side of the P522. These terminals

are described as follows:

TERM DESCRIPTION

+V 24 VDC power to viewing head

GND Power Ground

SC Self-check/shutter drive signal to

viewing head

SIG Flame signal from viewing head

SIG GND Signal ground

Figure 2 shows a four-conductor cable to the view-

ing head. Note that the flame signal wire going to

terminal SIG is shielded, and the shield is terminated

at both ends of the cable SIG GND.

WIRING SIDE VIEW - COVER REMOVED

CONNECT SHIELD

TO TERM 3

USE SHRINK TUBING

RED

GREEN

BLACK

WHITE

SHIELD

GND

SIG

GND

SIG

P522

+24VDC

GND

SHUTTER

DRIVE

GND

SIGNAL

FIGURE 2 - WIRING OF VIEWING HEAD

IRIS MODEL P522 APPLICATION MANUAL

Page 7

IRIS CABLE

3 CONDUCTORS PLUS 1 COAX

3CONDUCTORS: 16 AWG 19 STRAND INSULATED WITH

CROSSED-LINKED-POLYETHYLENE .017 THK

COLORS: BLACK-RED-GREEN

1 COAX: 16 AWG 19 STRAND INSULATED WITH

CROSSED-LINKED-POLYETHYLENE .017 THK

COLOR WHITE36 AWG BRAIDED SHIELD 90% COVERAGE

WITH .012 THK JACKET COLOR BLACK

CABLED: POLYPROPYLENE FILLERS FOR ROUNDNESS

JACKET: CROSSED-LINKED-POLYETHYLENE

STRIP 3/8“ TYPICAL

GROMMET

FLAT WASHER

CABLE ENTRY NUT

SHIELD *

CABLE

PREPARATION

1 3/4“

(TYP)

CABLE

CABLE CLAMP

CONNECTOR WITH

REAR COVER REMOVED

INSULATE SHIELD WITH SHRINK

TUBING LEAVING 3/8“ STICKING OUT

CONNECTOR JACKSCREW

FINAL ASSEMBLY

* CABLE IS SHOWN WITH SHIELD

ALREADY REMOVED FROM WHITE WIRE

FIGURE 3 - WIRING AND ASSEMBLY - VIEWING HEAD

Optional LTA Adapter

IRIS MODEL P522 APPLICATION MANUAL

Page 8

A source impedance resistor is required when using

the P522 module with a S550 viewing head. This

resistor should be 330 ohm (factory installed) for

viewing head cable runs up to 500 feet, and it should

be 150 ohm for cable runs 500 feet to 1000 feet.

The resistorshould beinstalled across theSC andSIG

GNDterminals. A 1/4 watt resistor is suitable.

Originally, specifications of the IRIS Model 500 in-

structed that a five-conductor cable be used, with

one wire shielded. However, the standard is now a

four-conductor cable, with one wire shielded. In

this case, the shield is used as the signal ground wire

that goes to terminal SIG GND on the P522 and to

pin 3 on the viewing head plug. The shield should

be a braided type for this application –do not use a

foiltype shield– so thata solid signalground is main-

tained. This signal ground shield is also the self-

checking circuit return path. Refer to Figures 2 and

3 for wiring details.

Connections of the IRIS cable to the viewing head

plug should be performed as follows:

After removing the plug from its packaging, take the

cable entry nut out of its housing. Remove rubber

grommetand flatsealing washer. Witha pairof long-

nosed pliers, remove the center ring only of the rub-

ber grommet.

1. Strip twoinches ofthe cable’souter cover

from the cable, removing any cellophane

wrap or filler material, and strip the in-

sulation from the shielded wire (if insu-

lated over shield) a full two inches, to

expose shield.

2. Slide the shield back until a bulge devel-

ops close to where the wire exits the

cable’s outer covering.

3. Carefullyspreadafewstrands oftheshield

atthe bulge–making surenotto breakany

strands–tocreateanopening, andslipwire

out of shield through opening.

4. Carefully return shield to original shape

and length by pulling gently, then cover

withplasticshrinktubingtoprevent shorts.

5. Slide nut (with threads toward the cable

end), the washer and the grommet onto

the cable approximately six inches.

6. Slip the cable through the bottom open-

ingof the connector, makingsure that the

cable’s outer jacket is secure under the

cable clamp, and tighten the two screws

on the cable clamp.

7. Reassemble thegrommet, flatwasher and

cable entry nut, and tighten.

8. Before wiring to connector, strip each

wire 3/8 inch, as shown in assembly dia-

gram, Figure 3.

9. Proceed to wire the connector. Refer to

Figure 2 for terminal locations.

– Connect the viewing head signal wire

WHT (the shielded wire) to terminal

No. 1 by inserting it into the opening,

then tightening the retaining screw.

– Connect the shutter drive signal wire

BLK to terminal No. 2.

– Connect the signal ground shield from

the WHT wire to terminal No. 3 with

shrink tubing.

– Connect the 24 VDC power wire RED

to terminal No. 4.

– Connect the power ground wire GRN

to terminal No. 5.

– Assemble the back of the plug and insert

jackscrew through the plug assembly.

The cable wiring at the other end going to the signal

processor is easier. The cable should be prepared in

a similar way to the plug end – particularly the shield

from the WHT wire. Make sure the shield doesn’t

touch the other terminals.

POWER SUPPLY

Careful consideration should be given to the power

supply used for the P522. 26 VDC is used to back

bias the “steering” rectifier, as shown in Figure 1, to

IRIS MODEL P522 APPLICATION MANUAL

Page 9

prevent the power from feeding into the 24 VDC

supply. EachP522 module drawsapproximately 150

mA, and each viewing head draws about 100 mA of

power(26 VDC). Actually, theS506 andS511 view-

ing heads use less current, but it is a good idea to

figure 100 mA for each viewing head used. Also,

the amount of current drawn by the P522 will de-

pend upon other factors that can affect the peak cur-

rent, such as whether or not there is flame being de-

tected, the remote meter output is connected, and se-

rial communication is occurring.

The viewing head is powered through the P522 via a

0.25 A self-resetting fuse. In other words, the 26

VDC power feeds into the P522 (through a 0.75 A

self-resetting fuse) and feeds back out through a 250

mA fuse to the viewing head, resulting in a current

drain of about 0.25 A for each P522 (with one view-

ing head). This small amount of current means that

one power supply could support a number of P522

modules. The self-resetting fuses change to high re-

sistance when their current ratings are exceeded, but

recover to their normal low resistance when power

is removed.

FACTORY STOCKED POWER SUPPLIES

Power supplies are readily available from the fac-

tory for the P522 modules. The 30-watt power sup-

ply will support up to six or seven P522 modules

with one viewing head each. The 50-watt power

supply will power up to six or seven P522 modules

withone viewinghead each. Andthe 100-wattpower

supply will support up to fifteen P522 modules with

one viewing head per each 100 watt. These “switch-

ing type” power supplies are efficient and very com-

pact. To obtain the size and weight of the power

supplies, contact IRIS Systems Inc.

Each power supply can be either rail mounted or

panel mounted, and it is up to each end user to deter-

mine their installation preferences and requirements.

WerecommendthatnotmorethanfourP522signalpro-

cessorsbesupportedbyone26VDCpowersupply. For

instance,four P522processors withone viewinghead

each equals a total of 26 watts – a relatively small

power supply, particularly if an efficient, switching

type is used.

Other possible combinations can be used; for in-

stance, the battery backup terminal could be used

for redundancy. However, care must be taken with

these redundant schemes to make sure that failure of

the primary power supply won’t affect the backup

power supply, as well.

REDUNDANT POWER SUPPLIES

It may be more economical to use larger-capacity

power supplies for applications using 12 or more

P522 signal processors.

For example: the 100-watt power supply

available from the factory can handle

twelveP522modules,each withoneview-

ing head. Should the power supply fail, a

redundant scheme utilizing two power

supplies with “steering” rectifiers to pre-

vent current from flowing into a failed

powersupply outputwouldprevent the12

flame monitors from being de-energized.

The positive output from each power supply is wired

to the anodes of the MBR 1545CT. This dual,

Schottky-typerectifier,ratedfor 15Amps,willpresent

a low forward voltage drop for this application. Both

power supplies can be adjusted for 26V output, and a

low-voltage indicator light can be used on the output

of each power supply to monitor their outputs.

Larger power supplies can be used with this redun-

dantwiringscheme ifthereare morethantwelve P522

STTAWNIYTICAPACYLPPUSREWOP225PLEDOMSIRI

YTQW5.7W51W03W05W001

1XXXX

2XXX

3XXX

4XX

01 X

FIGURE 4 - POWER SUPPLY TABLE

IRIS MODEL P522 APPLICATION MANUAL

Page 10

modulesin a system. Careshould betaken whenwir-

ing multiple P522s to ensure the selected bus wires

will carry the current. The plug-in terminals on the

P522 will accommodate a wire size up to 14AWG,

allowing for relatively high currents. Note that, if the

power wiring (26 VDC) is “daisy chained” by using

the terminal pairs provided, the pairs are “jumpered”

by copper traces on the mother board; so, if the plug

is pulled out, the jumpered connection is broken.

SELF-CHECKING FUNCTION

Whenenergized, the self checkingfunction indicates

that both the P522 and the viewing head are func-

tioning properly. The software in the P522 activates

the self-checking relay only if there are less than 10

pulses coming in from the viewing head during each

darkperiod. To energizethis relay, thesoftware must

generate pulses –at a particular rate and with a spe-

cific duty cycle– to a self-checking circuit. If this

regular pattern is not maintained, or if any of the

circuitry fails, the relay will drop out. The blinking

LEDon the front panellabelled SELF-CHECK O.K.

is evidence that voltage is applied to the coil of this

self-checking relay, because both are energized by

the same voltage. The difference is that the voltage

to the coil is applied steadily, while the voltage from

the relay to the LED is gated on and off by the soft-

ware in conjunction with the pulses counted during

the dark period.

Note that, with regard to the viewing head, the self

checking function still works the same way as with

the M502, A513 and D504 signal processors. For

instance, a runaway UV tube will cause a “lockout

condition” (more than 10 pulses counted during the

dark period). (Refer to section EXPLANATION

OF1-9, >10PULSES COUNTEDDURINGTHE

DARK PERIOD, in the Model 500 Signal Proces-

sor Application Manual.)

A runaway UV tube or any component failure, in-

cludingthe shutter,will causea lockoutcondition that

willde-energizetheflamerelay. The LOCKOUTlight

on the P522 will indicate this condition, requiring a

reset to return to normal flame monitoring mode. A

reset can be achieved only if the lockout condition

has been corrected, and can be performed from the

front panel (by pressing the RESET button), or re-

motely through the serial communication.

APPROVALS

TheP522andviewingheadshaveFactoryMutual(FM)

ApprovalforCombustionSafety; Canadian Standards

Association (CSA) Certification, and National Recog-

nized Testing Laboratories (NRTL) Listing.

POWERING UP THE P522

Once the power is connected (26 VDC) to the plug-in

connector, the P522 will be operational. There is no

ON/OFF switch on the P522; the moment it is pow-

ered on, it will reset and start up. The self-checking

light will start blinking, and one of the channel LEDs

(A or B) will light (A will be ON if the channel select

inputat the plug-inconnector isde-energized). Make

sure the voltage is 24 to 26 VDC. The P522 will be

resetwhenthepower isturnedon; however,thepower

must be a step function (i.e., the power must be ap-

plied abruptly) for this reset to work properly.

The P522 has been designed to deal with any fore-

seeable power failure or anomaly.

For example: if the power goes off while

you are in the process of storing a set

point (either from the front panel or from

the remote, host computer), the internal

power monitor circuit will signal the

P522 processor to complete the store

function before shutting down in an or-

derly manner. This prevents bogus num-

bers from being stored and protects ex-

isting data in the EEPROM (Electrically

Erasable Programmable Read Only

Memory) from corruption, and is facili-

tated by a special internal power supply

that holds a charge (like a battery) just

long enough to allow the processor to do

its job before going dead.

This internal circuit monitors the 26 VDC power

feeding the P522, and when the voltage drops to

about 19 volts, the processor shuts down, the pro-

gram stops running, and the self-checking function

ceases (the self-checking relay de-energizes). The

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