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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.
USER MANUAL
Put Bar Code Here
66-2066-01
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Summary of Contents for Honeywell P520
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Page 1: Specifications
APPLICATION 26VDC maximum, 6.4mA 10VDC, 2.3mA Flame Signal from Viewing Head (Isolated Input): The Honeywell P520 is a rack mounting signal processor that 7.5-30VDC range is compatible with viewing heads in the S5XX and S55XB/BE Input resistance 3900 ohms series. These include models S506, S509, S511 and S512, 13.6VDC, 3.2mA... -
Page 2: Installation
P520 SIGNAL PROCESSOR 4-3/16 (106) 5-1/16 (129) M33219 Fig. 1. P520 front faceplate dimensions. 9-3/32 (231) 5-1/16 (129) 35/64 (14) M33226 Fig. 2. P520 side view dimensions. INSTALLATION Grounding and Shielding NOTE: Installer must be a trained, experienced flame When Installing this Product…... - Page 3 Fig. 1 shows how these terminals are connected inside the through the internal PCB to the metal base of the P520. P520. Note the two fuses marked F1 and F2. F1 is the main It is important that good grounding practices be followed when power fuse for the signal processor as well as the viewing connecting power supplies.
- Page 4 A USB to RS422 converter must than the current signal count, then the flame relay will de- be used to communicate with the P520, and the connections energize on the subsequent cycle. are made to the terminals marked TX+, TX-, RX+ and RX-.
- Page 5 P520 SIGNAL PROCESSOR Wiring the Viewing Head Wiring of the viewing head is made to the terminals on the rear backplane PCB. These terminals are described as follows: Table 1. Terminal Descriptions. Terminal Description 24VDC power to viewing head Power Ground...
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Page 6: Power Supply
Careful consideration should be given to the power supply wire size up to 14AWG, allowing for relatively high currents. used for the P520. 24VDC is used to back bias the “steering” rectifier, as shown in Fig. 3, to prevent the power from feeding OPERATION into the 24VDC supply. -
Page 7: Changing Set Points
Once the power is connected (24VDC) to the proper terminal, the P520 signal processor will be operational. There is no ON/ Table 2. Set Point types. OFF switch on the P520; the moment it is powered on, it will Set Point Display Number reset and initialize. -
Page 8: Flame Failure Response Time (Ffrt)
Flame Off setpoint. This time delay is programmable from button is pushed indicates that an error was made when both the front panel of the P520 and a remote, host computer. selecting the set points. For instance, selecting a flame out set Only three settings are possible: one, two and three seconds. -
Page 9: Setup And Adjustment Procedures
Adjusting Set Points Sighting Adjustment Before adjusting the set points, take readings with the P520 Before making definitive settings (i.e., establishing the set on the two following conditions; write down the readings for points) for FLAME ON/OFF, the user must first optimize the the burner ON and OFF (with other burners on) under low sighting of the viewing head. -
Page 10: Troubleshooting
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 GND. If the voltage is low, check input voltage to the signal processor. If the input voltage is measured to be in spec, remove power and disconnect all connections to the viewing head(s). -
Page 11: Setting Addresses
P520 SIGNAL PROCESSOR To change or check the station number of the P520, proceed Table 6. 4x or numerical registers. as follows: Value Definition 400018 Viewing Head Type Channel B (read 1. Press and hold the Reset button for 4 seconds. - 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.
- Page 13 ADJUST IR FILTER “DEF?” RESET TO FACTORY KEEP NEW FILTER DEFAULT? SELECTION DISCARD CHANGES “ANNN” SET DEFAULT ADJUST IR GAIN VALUES 0-699 KEEP NEW IR GAIN DISCARD CHANGES NORMAL OPERATION NORMAL OPERATION M33289A Fig. 8. P520 with S550B/BE programming flowchart. 66-2066—01...
- Page 14 ADJUST IR FILTER SETTINGS? KEEP NEW FILTER SELECTION DISCARD CHANGES “DEF?” “ANNN” RESET TO FACTORY ADJUST IR GAIN DEFAULT? 0-699 KEEP NEW IR GAIN DISCARD CHANGES SET DEFAULT VALUES NORMAL OPERATION NORMAL OPERATION M33290A Fig. 9. P520 with S552B/BE programming flowchart. 66-2066—01...
- Page 15 CALIBRATE UV NORMAL OPERATION “ADJ?” “AUNN” ADJUST VIEWING HEAD ADJUST UV GAIN SETTINGS? 0-99 KEEP NEW UV GAIN DISCARD CHANGES NORMAL OPERATION “DEF?” RESET TO FACTORY DEFAULT? SET DEFAULT VALUES NORMAL OPERATION M33291A Fig. 10. P520 with S556B/BE programming flowchart. 66-2066—01...
- Page 16 P520 SIGNAL PROCESSOR Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North ® U.S. Registered Trademark Golden Valley, MN 55422 © 2012 Honeywell International Inc. 66-2066—01 M.S. 10-12 customer.honeywell.com Printed in United States...