Protective system control FCU
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Honeywell taper , schroder jHE; S tm pj. sa. ce Protective system controls • For monitoring and controlling central safety functions in multiple burner systems on industrial furnaces • Valve proving system for a valve system leak tightness check (optional) • Safety temperature monitor (STM) or safety temperature limiter (STL) (optional) • Long service life due to replaceable power module for fail-safe outputs • Visualization and adaptation to the specific application via the PC programming and diagnostic software BCSoft to simplify logistics management Product brochure ■ GB 6 Edition 06.16

FCU with plug-in connection terminals Protective system control FCU 500 is designed to monitor and control central safety functions, e.g. gasmin., gasmax., airmin., pre-purge, tightness test, high temperature operation or start enable for burner control units, in multiple burner systems on industrial furnaces. In a furnace and zone control system, the FCU 500 assumes central functions. The FCU 505 is used to monitor local safety functions and to control the zone capacity. If the centrally checked safety requirements, e.g. pre-purge, flow detector and pressure switch check, have been met,...

The external operator-control unit OCU is available as an option for the protective system controls. The OCU can be installed in the control cabinet door instead of standard control units. The program status, statistics, parameter values or fault messages can be read on the OCU. For burner adjustment, the operating points can be approached conveniently in Manual mode using the operator-control unit. Thanks to the operatorcontrol unit OCU, display functions and operation of the FCU can be relocated to the control cabinet door. The optional bus module BCM 500 makes it possible to connect the...

Application examples ON/OFF rotary impulse control VAS With ON/OFF cyclic control, the capacity supplied to the process is controlled by means of a variable ratio of the operating time to the pause time. In this type of control, the burner output pulse frequency always maintains full momentum and results in maximum convection in the furnace chamber, even with regulated heating. The pneumatic ratio control system controls the gas pressure on the burner proportionally to the air pressure and thus maintains a constant air/ gas ratio. At the same time, it acts as a low air pressure protection...

Safety limits (LDS) for modulating burner control VAS To ensure that the correct air volume is available for ignition (start fuel flow rate) when starting the burners, the FCU sends the burner start enable signal to the BCUs via the “LDS (limits during start-up)” output. The circuit design of the safety interlock and LDS outputs on the FCU and the corresponding inputs on the BCUs ensures that the burners can only start if the safety interlocks and the LDS output have enabled burner start-up. The centrally checked safety functions such as pre-purge, setting the valve to ignition position via...

Furnace and zone control The FCU 500 (furnace FCU) performs central tasks such as checking the safety interlocks, fan control, system leak tightness check and prepurge. It signals to the FCU 505 in the zones that the butterfly valves can be moved to the purge position. Signals are sent to the butterfly valves by the FCU 505. The butterfly valves move into position. A signal is sent to the FCU 505 via their safety interlock input that the central FCU 500 has issued the enable signal for the burners.

Technical data Electrical data Mains voltage FCU..Q: 120 V AC, -15/+10%, 50/60 Hz, ± 5%, FCU..W: 230 V AC, -15/+10%, 50/60 Hz, ±5%, for grounded mains only. Power consumption FCU..Q: at 120 V AC approx. 3 W/5.5 VA plus power consumption per AC input of approx. 0.08 W/0.2 VA, FCU..W: at 230 V AC approx. 6 W/11 VA plus power consumption per AC input of approx. 0.15 W/0.4 VA. Contact rating - Control outputs LDS (terminal 16), purge (terminal 17), HT (terminal 18), safety interlocks (terminal 57): max. 0.5 A, cos ^ = 1. - Valve outputs V1, V2 and V3 (terminals 13, 14 and 15): max. 1 A, cos ^ =...

Protective system control Furnace zone control Mains voltage: 120 V AC, 50/60 Hz 230 V AC, 50/60 Hz Integrated tightness control or POC: none with integrated tightness control or POC Capacity control: none modulating with interface for actuator IC modulating with interface for RBW Temperature monitoring: none with temperature monitoring Connection terminals: none screw terminals spring force terminals Maintenance The fail-safe outputs (valve outputs V1, V2 and V3) of the power module are monitored for correct functioning. In the event of a fault, the system is set to a safe status using a...