IRIS P520 Istruzioni per l’uso

FLAME MONITORING SYSTEM

MODEL P520 SIGNAL PROCESSOR

APPLICATION MANUAL

IRIS MODEL P520 APPLICATION MANUAL

Page 2

TABLE OF CONTENTS

Model P520 ------------------------------------------------4

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

FIGURE 1 - TERMINAL WIRING OF REAR PCB4

CARD FRAMES ------------------------------------------4

WIRING THE REAR PC BOARD --------------------5

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

FIGURE 3 - WIRING AND ASSEMBLY

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

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

WIRING OF VIEWING HEAD-------------------------8

POWER SUPPLY ----------------------------------------9

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

FIGURE 5 - 19” HALF-CARD FRAME WITH

STANDOFFS--------------------------------------------9

FACTORY STOCKED POWER SUPPLIES ------ 10

REDUNDANT POWER SUPPLIES---------------- 10

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

REMOTE I/O MODULE------------------------------- 11

FIGURE 6 - REMOTE I/O MODULE -------------- 11

FIGURE 7 - IRIS P520 I/O MODULE

SCHEMATIC--------------------------------------------- 12

FIGURE 8 - FIELD WIRING TO I/O MODULE------- 13

FIGURE 9 - I/O MODULE SHOWING

SELF-CHECKING & FLAME RELAY

CONTACTS ------------------------------------------- 14

APPROVALS -------------------------------------------- 15

POWERING UP THE P520-------------------------- 15

SET POINTS -------------------------------------------- 16

FIGURE 10 - SET POINTS -------------------------- 16

CHANGING SET POINTS --------------------------- 16

FLAME FAILURE RESPONSE

TIME (F.F.R.T.)--------------------------------------- 16

4-20mA REMOTE OUTPUT------------------------- 17

FIGURE 11 -REMOTE METER ANALOG OUT-

PUT------------------------------------------------------ 17

INSTALLATION OF VIEWING HEAD------------- 17

FIGURE 12 - VIEWING HEAD

CROSS-REFERENCE TABLE ------------------- 18

SIGHTING OF THE VIEWING HEAD------------- 18

MULTIBURNER REQUIREMENTS --------------- 19

FIGURE 13 - CUTOFF FREQUENCIES --------- 19

MULTIPLE VIEWING HEADS ---------------------- 19

DETERMINING SIGHT PIPE SIZE---------------- 20

SELECTING THE PIPE------------------------------- 20

MOUNTING HOLE------------------------------------- 20

MOUNTING OF SIGHT PIPE ----------------------- 20

INSTALLING THE VIEWING HEAD--------------- 20

PURGE AIR---------------------------------------------- 20

SET UP AND ADJUSTMENT PROCEDURES - 20

SIGHTING ADJUSTMENT--------------------------- 21

INITIAL SET UP ---------------------------------------- 21

ADJUSTING SET POINTS -------------------------- 22

TROUBLESHOOTING GUIDE --------------------- 23

NOISE INTERFERENCE AND GROUNDING------- 23

S506 VIEWING HEAD -------------------------------- 24

S506 SELF-CHECKING VIEWING HEAD------- 25

S509 VIEWING HEAD -------------------------------- 25

S511 VIEWING HEAD -------------------------------- 26

S512 VIEWING HEAD -------------------------------- 26

ORIFICING----------------------------------------------- 28

FIGURE 14 - ORIFICING: SIGNAL-REDUCING

CHARACTERISTICS OF DISCS ---------------- 28

SIGNAL SOURCES ----------------------------------- 28

ANGLE OF VIEW OF VIEWING HEAD ---------- 29

FIGURE 15 - VIEWING HEAD: ANGLE OF VIEW

- DISTANCE AND DIAMETER ------------------- 30

APPLICATION OF IRIS VIEWING HEADS ----- 30

LOW NOx APPLICATIONS-------------------------- 31

APPLICATION OF P520 ----------------------------- 31

USING A PLC WITH IRIS FLAME MONITOR ------ 31

FIGURE 16 - VIEWING HEAD APPLICATION

TABLES ------------------------------------------------ 32

FIGURE 16 - VIEWING HEAD APPLICATION

TABLES Cont’d.-------------------------------------- 33

BASIC BURNER START CIRCUIT ---------------- 34

FIGURE17-BASIC BURNERSTART CIRCUIT------- 35

MODULE COMMUNICATIONS -------------------- 36

MODBUS COMMUNICATION ---------------------- 36

COMMUNICATING WITH

MODICON PLC -------------------------------------- 37

COMMUNICATION WITH HUMAN-

INTERFACE HOST COMPUTER --------------- 37

RS-232 to RS-422 CONVERSION----------------- 37

SETTING ADDRESSES------------------------------ 37

TECHNICAL HELP------------------------------------- 38

FIGURE 18 - SPECIFICATIONS------------------- 39

FIGURE 19 - MODEL P520 SIDE VIEW --------- 40

FIGURE 20 - S5XX VIEWING

HEAD DIMENSIONS ------------------------------- 40

FIGURE 21 - 4 MODEL P520s FRONT AND

REAR VIEW MOUNTED IN FACF -------------- 41

FIGURE 22 - IR VIEWING HEAD LOCATION -------- 42

FIGURE 23 - UV VIEWING HEAD

LOCATION -------------------------------------------- 42

FIGURE 24 - OPPOSED FIRED VIEWING HEAD

SIGHTING --------------------------------------------- 43

FIGURE 25 - VIEWING HEAD MOUNTING. ------- 43

INDEX ----------------------------------------------------- 44

IRIS MODEL P520 APPLICATION MANUAL

Page 3

FIGURE 1 - TERMINAL WIRING OF REAR PCB -----------------------------------------------------------------4

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

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

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

FIGURE 5 - 19” HALF-CARD FRAME WITH STANDOFFS ----------------------------------------------------9

FIGURE 6 - REMOTE I/O MODULE -------------------------------------------------------------------------------- 11

FIGURE 7 - IRIS P520 I/O MODULE SCHEMATIC------------------------------------------------------------- 12

FIGURE 8 - FIELD WIRING TO I/O MODULE ------------------------------------------------------------------- 13

FIGURE 9 - I/O MODULE SHOWING SELF-CHECKING & FLAME RELAYCONTACTS ------------ 14

FIGURE 10 - SET POINTS -------------------------------------------------------------------------------------------- 16

FIGURE 11 -REMOTE METER ANALOG OUTPUT------------------------------------------------------------ 17

FIGURE 12 - VIEWING HEAD CROSS-REFERENCE TABLE ---------------------------------------------- 18

FIGURE 13 - CUTOFF FREQUENCIES --------------------------------------------------------------------------- 19

FIGURE 14 - ORIFICING: SIGNAL-REDUCING CHARACTERISTICS OF DISCS -------------------- 28

FIGURE 15 - VIEWING HEAD: ANGLE OF VIEW - DISTANCE AND DIAMETER--------------------- 30

FIGURE 16 - VIEWING HEAD APPLICATION TABLES-------------------------------------------------- 32, 33

FIGURE 17 - BASIC BURNER START CIRCUIT---------------------------------------------------------------- 35

FIGURE 18 - SPECIFICATIONS------------------------------------------------------------------------------------- 39

FIGURE 19 - MODEL P520 SIDE VIEW --------------------------------------------------------------------------- 40

FIGURE 20 - S5XX VIEWING HEAD DIMENSIONS ----------------------------------------------------------- 40

FIGURE 21 - 4 MODEL P520s FRONT AND REAR VIEW MOUNTED IN FACF----------------------- 41

FIGURE 22 - IR VIEWING HEAD LOCATION-------------------------------------------------------------------- 42

FIGURE 23 - UV VIEWING HEAD LOCATION ------------------------------------------------------------------ 42

FIGURE 24 - OPPOSED FIRED VIEWING HEAD SIGHTING----------------------------------------------- 43

FIGURE 25 - VIEWING HEAD MOUNTING ---------------------------------------------------------------------- 43

FIGURE INDEX

IRIS MODEL P520 APPLICATION MANUAL

Page 4

Model P520

The P520 is a Signal Processor used with the IRIS

Model 5xx- or 55x-series Viewing Heads. The P520

is a plug-in module, designed to conform to the DIN

41494 19-inch card frame system. It is designated as

3Uhigh and 21HPwide, or5.06 x 4.18inches, andits

length is 220mm (8.66 inches). A rear backplane PC

board (PCB) is required for termination.

WIRING AND INSTALLATION

Before wiring or installing the P520, we recommend that

you read the companion colour brochure describing the

hardware and the basic operation of this signal processor.

CARD FRAMES

The backplane card frame consists of a kit of parts

that will make up a 19-inch card frame. This kit

does not include the card guides that the module

slides into. Four card guides are required for each

P520module; therefore, atotal ofsixteen cardguides

would be required to mount four P520 modules. The

cardguides are packagedin quantities of10 perpack.

This rack also requires spacers for the top and bot-

tom of the rear backplane PCB, and the spacers are

available in packs of two.

FIGURE 1 - TERMINAL WIRING OF REAR PCB

IRIS MODEL P520 APPLICATION MANUAL

Page 5

The card frame kit does not include the card guides,

so these must be ordered separately - as with the

backplane type card frame. All card frames and ac-

cessories are available from the factory.

A half-card frame, or “half rack” (9.5 inches wide)

is available as an alternative to the 19-inch card

frame, and this half rack will mount two P520 mod-

ules. Again, the kit does not contain the card guides,

which must be ordered separately. As an option, the

cardframe can beassembled with thenecessary parts

ready for mounting (IRIS part numbers FACF, and

FACF-1/2).

WIRINGTHE REAR PC BOARD

A view of the rear backplane PCB is shown in Fig-

ure 1. The relay outputs are located on the nine-con-

tact terminal block (upper right).

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 ofthe self-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 in-

ternal software in the P520; or

- the power to the unit is OFF – the most

likely condition

The horizontal set of six terminals (top left) is used

for the main power into this plug-in module (PWR

IN). Each designated terminal is a double terminal,

or pair, so that the wiring from the power supply can

be“daisy chained” from oneP520 to thenext without

having to twist wires together into one termination.

The pair designated BAT is for battery backup, if

used. Note the rectifier (to the left of this group of

terminals) 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 P520 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 bat-

tery. The negative side of the battery goes to the

GND terminal on the right.

Figure 1 shows how these terminals are connected

inside the P520. 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. Each viewing head draws

about 100mA, so this output can supply only two

viewing heads; so, if more than two viewing heads

arerequired, it willbe necessary toincreasethe value

of fuse F2. Consult the factory for details. On newer

units (those with NO, CAL, and YES in red letters

onthe frontpanel) these fusesare self-resettingtypes,

and will recover from an overload automatically af-

ter power is removed from the P520 for 10 seconds.

Justbelowthe six-pinPWRINterminals aretwo,five-

pin vertically-mounted viewing head terminals 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. terminals.

BelowtheV.H. A.terminalsare twoterminalsmarked

V.H. SEL (viewing head selector relay). Energizing

this connection with 26 VDC will cause the relay on

this PCB to switch to viewing head B.

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. The 26 VDC

used to switch this relay can be connected without

regard to polarity. The two terminals marked V.H.

SEL go directly to the relay coil.

The two-pin terminal to the right of V.H. SEL des-

ignated CHAN SEL is used for selecting channel

A or channel B on the P520. Energizing this pair

of terminals causes the B channel to be selected.

IRIS MODEL P520 APPLICATION MANUAL

Page 6

Polarity must be observed when wiring this connec-

tion (the positive terminal is on the top). 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, because 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

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 remaining two-pin terminal designated RE-

MOTE METER (to the left of the V.H. SEL termi-

nals) is for the remote meter connection. This out-

put is a current-driven signal 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 control

system) applications (refer to section 4-20mA RE-

MOTE OUTPUT). Connect the terminal marked

“positive” to the positive meter terminal. This cur-

rent signal can be used with a volt meter by feeding

the signal to a resistor connected to the ground. The

voltage developed across the resistor 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 of3volts

for a 20mA output.

The terminals called TX+, TX-, RX+, and RX- (at

the bottom of the PCB) are used for the serial com-

munication link. They are also in pairs to accom-

modate “daisy chaining,” but the pairs are arranged

fortwisted pairs insteadof adjacentredundancy. The

serial communication is achieved by using ASCII

character code transmission at 4800 through the RS-

232 com ports on the host computer. The P520 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. An RS-232 to RS-422 converter must

be used to communicate with the P520, and the connec-

tions 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 P520 will

be reversed with respect to the RS-232

connection on the host computer. Refer

to later sections in this manual for a de-

taileddescription ofthe softwareand how

it is to be used with the P520.

FIGURE 2 - WIRING VIEWING HEAD

IRIS MODEL P520 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

Optional LTA Adapter

FIGURE 3 - WIRING AND ASSEMBLY VIEWING HEAD

IRIS MODEL P520 APPLICATION MANUAL

Page 8

WIRING OF VIEWING HEAD

Wiring of the viewing head is made to the termi-

nals on the rear backplane PCB. 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 7 on the M502 is shielded, and the shield is

terminated at both ends of the cable.

A source impedance resistor is required when using

the P522 module with a S550 viewing head. This

resistor should be 330W for viewing head cable runs

up to 500 feet, and it should be 150W for cable runs

500feet to 1000feet. The resistor shouldbe installed

across the SC and SIG GND terminals on the rear

backplane PCB. 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 P520 (termi-

nal 8 on the M502) and to pin 3 on the viewing head

plug. The shield should be a braided type for this

application –do not use a foil type shield– so that a

solidsignal groundis maintained. This signalground

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. Carefullyspreadafewstrandsoftheshield

atthe bulge–making surenotto breakany

strands–tocreatean opening,andslipwire

out of shield through opening.

4. Carefully return shield to original shape

and length by pulling gently, then cover

withplasticshrinktubingtopreventshorts.

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-

ingofthe 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 wiringtoconnector,strip eachwire

3/8 inch, as shown in assembly diagram.

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.

– Connectthe signalground shield from

the WHT wire to terminal No. 3 with

shrink tubing.

IRIS MODEL P520 APPLICATION MANUAL

Page 9

– Connectthe 24VDC powerwire RED

to terminal No. 4.

– Connect the power ground wire GRN

to terminal No. 5.

– Assemblethebackoftheplugandinsert

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 P520. 26 VDC is used to back

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

preventthe power from feedinginto the 24VDC sup-

ply. EachP520module drawsapproximately200mA,

andeach viewinghead drawsabout 100 mAof power

(26 VDC). Also, the amount of current drawn by the

P520 will depend upon other factors that can affect

thepeak current, suchas whether ornot thereis flame

being detected, the remote meter output is connected,

and serial communication is occurring.

The viewing head is powered through the P520 via a

.25A self-resetting fuse. In other words, the 26 VDC

power feeds into the P520 (through a .75A self-reset-

ting fuse) and feeds back out through a 250 mA fuse

to the viewing head, resulting in a current drain of

about300 mA foreachP520 (withoneviewing head).

This small amount of current means that one power

supply could support a number of P520 modules (the

disadvantage, of course, is that if the power supply

fails, all the P520 modules connected go off). The

self-resetting fuses change to high resistance when

their current ratings are exceeded, but recover to their

normal low resistance when power is removed.

STTAWNIYTICPACYLPPUSREWOP225PLEDOMSIRI

YTQW5.7W51W03W05W001

1XXXX

2XXX

3XXX

4XX

01 X

FIGURE 4 - POWER SUPPLY TABLE

FIGURE 5 - 19” HALF-CARD FRAME WITH STANDOFFS

IRIS MODEL P520 APPLICATION MANUAL

Page 10

FACTORY STOCKED POWER

SUPPLIES

Power supplies are readily available from the fac-

tory for the P520 modules. The IRISPS030 power

supply will support up to three P520 modules with

one viewing head each. The 50-watt power supply

will power up to six or seven P520 modules with

one viewing head each (30 watt). The IRISPS050

power supply will support up to six P520 modules

with one viewing head each (50 watt). And the

IRISPS100 will power up to twelve P520 modules

with one viewing head each (100 watt). These

“switching type” power supplies are efficient and

very compact. 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.

We recommend that not more than four P520 signal

processors be supported by one 26 VDC power sup-

ply. For instance, four P520 processors with one

viewing head each equals a total of 31.2 watts – a

relatively small power supply, particularly if an ef-

ficient, 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

P520 signal processors.

For example: the 100-watt power supply

available from the factory can handle

twelveP520modules,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-type rectifier, rated for 15 Amps, will

present a low forward voltage drop for this applica-

tion. 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-

dant wiring scheme if there are more than twelve

P520 modules in a system. Care should be taken

when wiring multiple P520s to ensure the selected

bus wires will carry the current. The rear PCB on

the P520 will accommodate a wire size up to

14AWG, allowing for relatively high currents.

SELF-CHECKING FUNCTION

Whenenergized, the self checkingfunction indicates

that both the P520 and the viewing head are func-

tioning properly. The software in the P520 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

LEDonthe 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.)

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