Datasheet Content
[{"filename":"MF-00-2-0600-0-050-B_Water_Level_Control_NXEXP300.pdf","text":"Nexus Water Level/\n ®\n\n\n\nDraft Control\n\nWater Level Control\nNXEXP300\nMicroprocessor-based expansion module\nfor use with the Nexus series of parallel\npositioning controls (PPC6000 or NX6100)\n\nWater (drum) level control, sequence draft control\nand expanded digital inputs can be attained when\nthe Nexus water level/draft control (3G-OTH-02804) and\nthe Fireye parallel positioning system (PPC6000 or\nNX6100) are combined.\n\nBasic water level control using a Fireye CANbus\nservomotor and suitable valve can be controlled by\none, two or three elements of the boiler system:\ndrum level, steam flow and feed water flow.\n\nSequence draft control is also standard with the module.\nUtilizing a suitably-ranged differential pressure sensor and\nFireye CANbus servomotor, controlling the boiler outlet Water level control (3G-OTH-02804) with\ndamper through pre-purge, light off and run couldn’t be optional daughterboard (NSDBWLC) installed\neasier.\n\nAdditional features include an additional seven low voltage Features\nand two line voltage safety-rated digital inputs. These\ninputs provide additional safety interlock annunciation • One, two or three element boiler water level1 control via\nas well as position-proving inputs for outlet dampers, 4-20mA inputs from field devices; feed pump VFD and\ncombustion air make-up dampers and/or user defined pump sequencing is also included\noptions. • Built-in sequence draft control2 manages the boiler\n outlet damper through pre-purge, light off and operation\nThe optional daughterboard (NSDBWLC) expands reducing standby and operating losses\nthe basic water level control to include measurement\nand control of boiler total dissolved solids (TDS) using • Industry standard total dissolved solids (TDS) probe\nindustry standard TDS probes3. The daughterboard has provides the option to control surface blowdown based\ninputs for the TDS probe as well as an RTD (PT100) type on TDS levels set by operators\nboiler temperature sensor. If no sensor is available, the • Flexibility: utilize proven Fireye CANbus servomotors or\ndaughterboard relies on the standard saturated steam table industrial 4-20mA current or I/P feed water valves\nin its memory. The total dissolved solids are controlled by • Wiring: international voltage setting and simple four\nsurface and/or bottom blow down. A full-range of options wire CANbus interconnections make wiring a snap;\nallows flexibility to meet most boiler requirements. safety relay contacts can easily be inserted into the\n existing control wiring\n • Reliable operation with proven hardware and many\n years of in-field service\n • Reconfigured to provide additional features\n • Approvals: UL, FM, CE, SIL\n¹Requires optional NXTSD104 display\n²Required field sensors not supplied by Fireye\n³TDS probe by others, consult Fireye\n\n\n\nfireye.com\n\fNexus Water Level/Draft Control\n\nSpecifications and Performance\nThe Fireye Nexus water level control (3G-OTH-02804) is a microprocessor-based expansion module for use with Nexus\nparallel positioning controls (PPC60001 or integrated NX6100 series). It expands the capability of the parallel positioning\nsystem by adding valuable safety-rated digital inputs, sequence draft control, boiler water level control and total dissolved\nsolids (TDS) surface and bottom blowdown control. The small footprint (5 in. L x 8.5 in. W x 3.75 in. H), adjustable voltage\n(120/230, 50/60 Hz) and simplified wiring provide easy retrofit to existing Fireye systems.\nThe water level control expands the capability of the\nparallel positioning system with seven low voltage, safety-\nrated digital inputs along with two line voltage, safety-\nrated digital inputs. When configured via available option\nparameters, these inputs can be used to simply annunciate\nconditions or shut the boiler down.\nSequence draft control is built into the module to control\nthe boiler output damper. When combined with an\nappropriate differential pressure sensor, Fireye servomotor\nor third-party actuator, the outlet damper will modulate\nand maintain the manufacturer’s outlet draft set point.\nThe damper can be controlled with a Fireye CANbus-\ndriven servo motor or a third-party actuator capable of\naccepting a 4-20mA signal. Analog control requires optional\ndaughterboard (NXDBWLC or NXDBVSD) in main control.\nMaximum input impedance of actuators is 250 ohms. The Water Level Daughterboard\nboiler outlet damper is controlled during standby, pre-purge,\nignition and operation to provide a consistent outlet draft for The optional expansion daughterboard (NXDBWLC)\nimproved combustion performance and reduced standby enhances the capability of the Nexus system by\nlosses. optimizing boiler water quality and level. The results\n are higher-quality steam and reduced boiler water side\nOther Enhancements scaling.\n • Oxygen trim - 20+ years proven oxygen probe The daughterboard includes an input from the\n technology measurement of total dissolved solids (TDS) which\n • VFD - Daughterboard for PPC6000/NX61000 provides in turn controls a surface, bottom or combination of\n two VFD channels plus modbus RTU blowdown valves. A fully programmable operating\n scheme allows each site to be custom configured\n based on water and operating conditions. Provisions\n are made for connecting a RTD temperature sensor\n (PT100) or the system can use a built-in steam table\n for estimating water temperature compensation.\n The daughterboard features one analog output for\n controlling the boiler feed water valve or the sequence\n draft damper. The maximum input ompedance of the\n actuators must not exceed 250 ohms.\n\n\n\n\nFor more information, please contact your local Fireye Distributor.\nfireye.com\nMF-00-2-0600-0-050-B (2024/08)\nAll trademarks and service marks referred herein are property of their respective owners.\n©2024 Fireye. All Rights Reserved.\n\n Join us on"}]
