11
3 Brief Description
3 Brief Description
The ETAMATIC regulates up to 4 control elements as a function of a control variable, in ac-
cordance with freely programmable curves. The ETAMATIC has 4 three-point step control out-
puts. The ETAMATIC S has 3 three-point step control outputs and one 4-20 mA output.
Examples of possible control elements:
• combustion air damper
• combustion air fan (ETAMATIC S only)
• fuel valve
• recirculation damper
Up to 20 points (usual 11) can be programmed per channel. The Display is relative between
0 and 999.
The ETAMATIC has a 25-pole Sub-D connector with serial interface for remote operation / re-
mote display via a PC (Windows software available separately). Connections for Interbus-S,
PROFIBUS-DP, CANopen, TCP/IP (Modbus TCP) and Modbus RTU are available as optional
equipment. Other BUS-systems available on enquiry. The connection of other plant compo-
nents, e.g. fault signal systems and O
2
trim, is via the LAMTEC SYSTEM BUS interface to a
9-pole Sub-D connector.
Operation is via a front panel laminated keyboard. The parameters are displayed on a 2-row
LCD screen.
The ETAMATIC continuously monitors its own functions and those of the connected control
elements.
230-V outputs:
• Actuation of the gas valves
• Actuation of the oil valves
• Actuation of the oil pump
• Actuation of the ignition valve and the ignition transformer
• Fan release
• Fault message
• Open/Close control signals for the valve/damper motors
External signals to the ETAMATIC are transmitted via floating contacts or chains of contacts.
The following signals can be pre-set:
• 3 separate safety interlock circuits
• fault release
• air pressure monitor
• control release
• min. gas pressure monitor (for valve leakage test)
• flame signal
• ignition position acknowledgement
• re-circulation on
• burner on
• select fuel
• setpoint switching (for firing rate control)
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