Burner Control Unit PFU 760

The burner control unit PFU 760 controls, ignites, and monitors gas burners for intermittent or continuous operation. Its fully electronic design reacts quickly to various process requirements and is therefore suitable for frequent cycling operation.

The PFU 760 can be used for directly ignited industrial burners. The burners can be modulating or stage-controlled.

On industrial furnaces, the PFU 760 reduces the load on the central furnace control by taking over tasks that only relate to the burner, for example, it ensures that the burner always ignites in a safe condition after it has been restarted.

The burner control unit is used for burners with mechanical combustion air supply where the fan is controlled by a separate logic and for atmospheric burners.

The air valve control on the burner control unit PFU 760L assists the furnace control for cooling, purging, and capacity control tasks.

The program status, the unit parameters, and the level of the flame signal can be read directly from the unit. The burner can be controlled manually for commissioning and diagnostic purposes.

If the local requirements on the burner control unit change, the PC software BCSoft can be adjusted to the unit parameters of the application using the optical interface.

Users can see input and output signals and the error history.

Features

• For directly ignited burners of unlimited capacity in intermittent operation or in continuous operation pursuant to EN 746-2
• Plug-in function unit for mounting in 19" module subracks
• Flame control by UV, ionization, or by using the furnace chamber temperature
• Display of the program status, unit parameters and flame signal; manual mode for burner adjustment and for diagnostic purposes
• Programming and diagnostic software BCSoft simplifies logistics management
• Air valve control relieves the furnace control
• Connection to PROFIBUS-DP via field bus interface PFA 700
• FM approved

	Documentation Manufacturer's Product Brochure Manufacturer's Operating Instructions Manufacturer's Technical Sheet
	Ordering Information Model Mains Voltage Ttrial for Ignition Period Air Valve Control Digital Input* Price (US List) Order Now PFU 760N 5/2 115 V AC 5 seconds No No $500 PFU 760 N 10/2 115 V AC 10 seconds No No $500 PFU 760 LN 5/2 115 V AC 5 seconds Yes No $525 PFU 760 LN 10/2 115 V AC 10 seconds Yes No $525 PFU 760LND 5/2 115 V AC 5 seconds Yes Yes $625 PFU 760LND 10/2 115 V AC 10 seconds Yes Yes $625 PFU 760 N 10/2 K1† 115 V AC 10 seconds No No $500 PFU 760 LN 10/2 K1† 115 V AC 10 seconds Yes No $525 For all other configurations Contact Combustion 911 * Digital Input to interrupt flame monitoring. † Compatible with PFS/PFD. Accessories Model Description Price (US List) Order Now BCU OPTO Opto-adapter (serial port connection) includes BCSoft CD-ROM $284
	Applications Click on images for close-up view. Staged On/Off burner control The burner can be started with reduced capacity. A UV sensor monitors the flame signal from the burner. UV sensor UVD 1 is used for continuous operation, UV sensor UVS for intermittent operation. Staged High/Low burner control The burner starts at low-fire rate. When the operating state is reached, the PFU 760L advises the control unit. The PLC can now pulse the air valve in order to control the burner capacity. Two-stage-controlled burner Control: ON/OFF with ignition via bypass The burner starts at low-fire rate. When the operating state is reached, the PFU 760L issues the Enable signal for the maximum burner capacity. Modulating-controlled burner Control: continuous The external control system moves the butterfly valve for air BVA to ignition position. The burner starts at low-fire rate, and a controller in the PLC controls the burner capacity via the butterfly valve for air BVA after the operating state has been signalled.
	Specifications Electrical Specifications Mains voltage: 220/240 V AC, -15/+10%, 50/60 Hz, 110/120 V AC, -15/+10%, 50/60 Hz, for grounded and ungrounded mains. Power consumption: < 8 VA. Control Inputs: Input voltage/current: Burner, air valve, multi-flame control and remote reset: 24 V DC, ± 10%, < 7 mA per input. Input voltage for safety interlocks, digital input DI and purge = mains voltage. Input voltage of signal inputs: 110/120 V AC Signal "1": 80-132V (50/60Hz) 110/120 V AC Signal "0": 0-20V (50/60Hz) 220/240 V AC Signal "1": 160-264V (50/60Hz) 220/240 V AC Signal "0": 0-40V (50/60Hz) 24 V DC Signal "1": 24 V, ±10% 24 V DC Signal "0": < 1 V Inherent current (Signal "1"): typ. 5 mA Output voltage for voltage-related outputs: mains voltage Contact rating: Gas valve V1, V2: Max. 1 A resistive; Max. 1 A cos ϕ 0.3 Air valve: Max. 1 A resistive; Max. 1 A cos ϕ 0.3 Ignition: Max. 1 A resistive; Max. 1 A cos ϕ 0.3 Number of operating cycles: Max. 1,000,000 typically 400,000; Max. 250,000, typically 100,000 Output current: max. 2 A per output, but total current for valves and ignition transformer max. 2.5 A. Number of operating cycles: Mains switch: 1000 Reset/Information button: 1000 Signalling contacts: max. 24 V, 1 A. Flame control: Sensor voltage: approx. 230 V AC. Sensor current: > 1 μA, Length of sensor cable: max. 100 m. Fuse in unit: F1: 3.15 A, slow-acting, H pursuant to IEC 127-2/5, F2: 3.15 A, slow-acting, H pursuant to IEC 127-2/5.     General Specifications Ambient temperature: -20 to +60°C (-4 to +140°F), no condensation Enclosure: IP 20 pursuant to IEC 529. Input/Output safety circuit: See connection diagrams in documentation Weight: approx. 650 g (23 oz.)