VMS fuel-air ratio control system
Fail-safe electronic fuel-air ratio control for up to 5 actuators with integrated CO/O₂ control
LAMTEC · VMS4 · VMS5
- ≤ 5 actuators
- SIL3 · CE
- CO/O₂ control
VMS is an electronic fuel-air ratio control system for up to five actuators. CO/O₂ control is built in, and on request the unit also takes over load control of the burner. Its fail-safe design gives flexibility in the settings of a kind usually only a PLC provides. Short cable runs markedly reduce extra relays and connections, and a small control cabinet on site is often enough. A relay module with signal outputs can serve as the communication interface to the burner sequencer.
Each actuator can be driven by a 0/4…20 mA current signal or as a three-point step drive, except channel 5, which takes a current signal only. Two correction inputs shift the set fuel-air curves during operation, for example to offset changes in intake air temperature. Two fuels can be fired together at a variable mixing ratio. Plug-in cards adapt the analogue inputs to different physical quantities, and software functions such as corrections are set as parameters on site during commissioning.
Operating and fault messages are shown as plain text in the user's language. The unit is operated directly on its front with password protection, or remotely through the PC interface. Working with LT1, LT2 or LT3 analysers, CO/O₂ control shifts the curves during operation to offset changes in temperature, humidity, air pressure and fuel quality. VMS is certified to DIN EN 298:2012-11.
VMS fuel-air ratio control system
- Up to 5 channels of electronic fuel-air ratio control, driven by 0/4…20 mA or three-point step (channel 5 by current only)
- CO/O₂ control that adjusts the air in real time and builds an operating curve suited to the site
- Optional integrated load controller
- Two fuels fired at the same time with a variable mixing ratio
- Two correction inputs that shift the curves during operation
- Universal fieldbus interface for linking to plant automation
- Relay module with signal outputs for communication with the burner sequencer
- SIL3 to DIN EN 61508; certified to DIN EN 298:2012-11
VMS fuel-air ratio control system
Relay modules
Relay modules signal the burner sequencer with high fire, ignition position, fault and safety chain outputs, and drive the actuators with three-point step control. The range includes the VMS control unit relay module (one per VMS) for the gas valve, oil valve and fan, two-relay modules (IP00 or IP20) for motors up to 50 mA (up to approx. 30 Nm), a two-relay module for motors up to 3.15 A, and a module for oil/gas channel changeover.
LSB I/O modules
Add-on modules for the optional LAMTEC SYSTEM BUS interface: two output module types for 4 analogue signals, 0…10 V DC or 0…20 mA; a 4-channel analogue input module for 0…10 V DC; a module for 4 floating digital outputs; and a 4-channel digital input module for 24 V DC. An additional power supply for the modules is available.
Key specifications
| Specification | VMS |
|---|---|
| Fuel-air ratio channels | ≤ 5 |
| Fuels | Gas · Oil · 2 (variable-ratio mixed firing) |
| Interfaces | LSB, PROFIBUS DP, Modbus TCP, Modbus, INTERBUS-S (optional) |
| Safety integrity level | SIL3 |
Approvals and standards
- CE declaration of conformity (2014/35/EU, 2014/30/EU, 2014/68/EU, 2009/142/EC)
- EU type examination certificate — 2014/68/EU, Module B (pressure equipment)
- EC type examination certificate — 2009/142/EC (gas appliances)
- SIL3 — DIN EN 61508
- DIN EN 298
- DIN EN 1643
- DIN EN 230
- DIN EN 60730-2-5
- DIN EN 12067-2
- DIN EN 13611
- DIN EN 50156-1
Accessories
- Communications processor and fieldbus modules for PROFIBUS DP, Modbus RTU, Ethernet TCP/IP or INTERBUS, supplied with connecting cable
- GUI307 colour touch screen: 7-inch, 800 × 400 pixels, IP65 at the front
- GUI310 colour touch screen: 10.1-inch, 1280 × 800 pixels, IP65 at the front
- GUI315 colour touch screen: 15.6-inch, 1366 × 768 pixels, IP65 at the front
- Speed sensors: 663R8101 two-wire NAMUR type (2 mm switching distance) and 663R8103 three-wire inductive proximity switch (4 mm)
- PC software (Remote Software): remote operation from a laptop over RS232, with archiving of configuration and curve data
- FMS/VMS Swing Frame: swing frame for the VMS
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