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USER MANUAL

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66-2066-01

P520 Signal Processor

APPLICATION

The Honeywell P520 is a rack mounting signal processor that 

is compatible with viewing heads in the S5XX and S55XB/BE 

series. These include models S506, S509, S511 and S512, 

and the advanced viewing head series models S550B/BE, 

S552B/BE and S556B/BE. There is only one model of the 

P520 available, which is DC powered. A rear backplane PC 

Board is required for termination (order part number 

REARPCB separately for initial installation). 

FEATURES

• Rack mounted system, designed to conform to the DIN 

41494 19 inch card frame system

• 3U high and 21HP wide, or 5.06 x 4.18 inches with a 

length of 8.66 inches (220mm)

• Once rack mounted, together with a power supply and 

appropriate viewing head makes up a complete flame 

monitoring system

SPECIFICATIONS

Electrical Ratings

Input Power: 22 - 26VDC, 130mA (plus 100mA for each 

Viewing Head.)

Battery Backup: 24VDC, 130mA (plus 100mA for each 

Viewing Head.) Main Voltage > Battery Voltage

Ambient Temperature:

0°C to 52°C (32°F to 125°F) CSA Rating

0°C to 60°C (32°F to 140°F) FM Rating

Outputs:

Flame Relay: 2 Form C Contacts (DPDT)

Self-Checking Relay: 1 Form C Contact (SPDT)

Contact Ratings: 5A at 30 VDC, 125 VAC and 277 VAC 

Max switching voltage 220Vdc, 250Vac

Analog Flame Signal: 0 to 19.8mA current output for 

remote meters and 4 to 19.8mA output. (360 ohm max. 

resistance.)

Power to Viewing Head: 

+26VDC maximum, fused 0.25A (self-resetting)

+14.3VDC pulsing 0.2 seconds ON, 0.8 seconds OFF

Inputs:

Channel Select (Isolated Input):

   7.5-30VDC range

   Input resistance 3900 ohms

   26VDC maximum, 6.4mA

   10VDC, 2.3mA

Flame Signal from Viewing Head (Isolated Input):

   7.5-30VDC range

   Input resistance 3900 ohms

   13.6VDC, 3.2mA

Serial Communications:

RS-422 (Differential) 

4800 or 9600 baud (user selected) 

4 wire / 2 twisted pair

Cable (between viewing head and signal processor):

4 conductor, #16 AWG or #18 AWG, one wire shielded with 

braided shield for flame signal. Honeywell C328 cable is 

recommended.

Summary of Contents for P520

Page 1: ... each Viewing Head Battery Backup 24VDC 130mA plus 100mA for each Viewing Head Main Voltage Battery Voltage Ambient Temperature 0 C to 52 C 32 F to 125 F CSA Rating 0 C to 60 C 32 F to 140 F FM Rating Outputs Flame Relay 2 Form C Contacts DPDT Self Checking Relay 1 Form C Contact SPDT Contact Ratings 5A at 30 VDC 125 VAC and 277 VAC Max switching voltage 220Vdc 250Vac Analog Flame Signal 0 to 19 8...

Page 2: ...ard control technician 4 After installation is complete check out product opera tion as provided in these instructions Grounding and Shielding NOTE Installer must be a trained experienced flame safeguard service technician and should be familiar with the equipment operation and limita tions and be aware of any applicable local codes and regulations 1 Connect a safety ground to the viewing head hou...

Page 3: ...e located on the nine contact terminal block located on the upper right of the board RC C refers to the common terminal of the self checking relay There is only one pair of contacts used for the self checking function Here the designation ON refers to the self checking taking place in a normal manner OFF indicates a failure in the viewing head or processor resulting from the internal or external h...

Page 4: ...The voltage developed across the resistor will follow Ohm s law V IR For example a 3 volt meter can be used with a resistor of 3 02 150 ohms which will result in a full scale reading of 3 volts for a 20mA output The terminals called TX TX RX and RX at the bottom of the PCB are used for the serial communication link They are also in pairs to accommodate daisy chaining but the pairs are arranged for...

Page 5: ...en SC and SIG GND terminals for proper signal trans mission For resistor value refer to Wiring of Viewing Head section Fig 4 Viewing head wiring Table 1 Terminal Descriptions Terminal Description V 24VDC 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 M33509 CABLE CLAMP CONNECTOR WITH REAR COVER REMO...

Page 6: ... fuses are re set when power to the signal processor is removed It is recommended that no more than four P520 signal processors be supported by one 24VDC power supply unless a method of redundancy is employed together with larger capacity power supplies Other possible combinations can be used for instance the battery backup terminal could be used for redundancy However care must be taken with thes...

Page 7: ... P520 There is a 20 per cent probability that a lockout will occur because of the duty cycle of the self check function 200 mSEC on and 800 mSEC off The S506 and S511 do not incorporate the power monitoring shutdown function and will not cause a lockout condition These design precautions ensure that there will never be an unsafe situation created by abnormal line power 115VAC conditions The 26VDC ...

Page 8: ...akes for the flame relay to de energize after the flame signal from the viewing head is below the programmed Flame Off setpoint This time delay is programmable from both the front panel of the P520 and a remote host computer Only three settings are possible one two and three seconds The maximum time delay is limited to three seconds in compliance with the FM Factory Mutual limit of the F F R T to ...

Page 9: ...e maximum signal Adjusting Set Points Before adjusting the set points take readings with the P520 on the two following conditions write down the readings for the burner ON and OFF with other burners on under low load conditions and then the readings for the burner ON and OFF under high load conditions There must be a definitive ratio between the readings for burner ON and burner OFF This ratio can...

Page 10: ...onds If the self resetting fuse has tripped removing then reapplying power will reset the fuse Digital display shows 0000 and there is no flame signal 1 Remove connector from viewing head and check wiring per Fig 4 and 5 2 Ensure the proper impedance resistor is in place refer to Wiring of Viewing Head section Using a volt meter check the viewing head terminals on the P520 for 24VDC across V and G...

Page 11: ... must have galvanic ground isolation Setting Addresses Each P520 must have its own unique address The address can easily be changed by pressing the RESET push button for 2 seconds This causes the P520 to display its address on the four digit display 0000 to 0063 The address can now be changed by using the UP or DOWN arrow buttons When the desired address is displayed push the STORE button and the ...

Page 12: ... USE SHIELDED CABLE FOR COMMUNICATION WIRING DRAWING IS FOR GENERAL REFERENCE ONLY FOR RS422 COMMUNICATION WITH THE P520 4 WIRES FROM EACH SIGNAL PROCESSOR WILL BE REQUIRED RX RX TX TX FOLLOWING POLARITY FROM EACH SIGNAL PROCESSOR AT THE CONVERTER THE TRANSMIT AND RECEIVE WIRES WILL BE REVERSED REFER TO FIG 7 FOR CONVERTER TO SIGNAL PROCESSOR WIRING DETAILS COMMOD USB TO RS422 485 CONVERTER M33904...

Page 13: ... IR Y AUNN ADJUST UV GAIN 0 99 Y NORMAL OPERATION N Y N DISCARD CHANGES NORMAL OPERATION Y KEEP NEW FILTER SELECTION ARFN ADJUST IR FILTER 1 8 Y KEEP NEW UV GAIN ANNN ADJUST IR GAIN 0 699 N DISCARD CHANGES Y Y N DISCARD CHANGES Y KEEP NEW IR GAIN N Y SET DEFAULT VALUES ADJ ADJUST VIEWING HEAD SETTINGS DEF RESET TO FACTORY DEFAULT CALR AUTO ADJUST IR GAIN PROGRAMMING FLOWCHART FOR P520 WITH S550B B...

Page 14: ...Y CALIBRATE IR Y Y NORMAL OPERATION N NORMAL OPERATION Y KEEP NEW FILTER SELECTION ARFN ADJUST IR FILTER 1 8 ANNN ADJUST IR GAIN 0 699 N DISCARD CHANGES Y Y N DISCARD CHANGES Y KEEP NEW IR GAIN N Y SET DEFAULT VALUES ADJ ADJUST VIEWING HEAD SETTINGS DEF RESET TO FACTORY DEFAULT CALR AUTO ADJUST IR GAIN PROGRAMMING FLOWCHART FOR P520 WITH S552B BE M33290A ...

Page 15: ...ATE VIEWING HEAD N N CALU AUTO ADJUST UV GAIN NORMAL OPERATION CALIBRATE UV Y Y AUNN ADJUST UV GAIN 0 99 Y NORMAL OPERATION PROGRAMMING FLOWCHART FOR P520 WITH S556B BE Y N DISCARD CHANGES NORMAL OPERATION Y KEEP NEW UV GAIN N Y SET DEFAULT VALUES ADJ ADJUST VIEWING HEAD SETTINGS DEF RESET TO FACTORY DEFAULT N M33291A ...

Page 16: ...tion and Control Solutions Honeywell International Inc 1985 Douglas Drive North Golden Valley MN 55422 customer honeywell com U S Registered Trademark 2012 Honeywell International Inc 66 2066 01 M S 10 12 Printed in United States ...

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