Type ⁄ WG1
Application
FM 020
Field bus module (Modbus) for climate control convectors, heating and air conditioning units
Note:
For manual intervention and room temperature measurement, an analog room device is used.
Analog inputs
The device has four passive analog inputs:
• Room temperature (Pt1000 sensor)
• Setpoint adjustment (potentiometer 0...500 Ohm)
• Step switch for fan coil convectors
Auto: 500 Ohm or more (not connected)
Off: 100 Ohm or less (short-circuited)
St1: 180 Ohm
St2: 270 Ohm
St3: 390 Ohm
• Reserve (for a Pt1000 sensor)
This has no influence on the control functions, however it can be read out and displayed by the central building control system.
When the setpoint adjustment collects a value of more than 1500 Ohm (not connected), the correction value is 0 K. The correction value an be
adjusted in the range of 0 ... 500 Ohm using configuration software. Standard values are – 3.5 ...+ 3.5 K.
Analog outputs
The device has four passive analog outputs:
The analog outputs provide a 0...10 V signal for the activation of heating and cooling valves.
Reference potential for 0...10 V is the same as for 24 V AC, reference point G0.
The same signal converted to 24 V AC pulse width modulated optimised for thermovalves is available at DO1 and DO2.
Digital inputs
The device has four potential-free digital inputs, which are operated at 24 V AC (the G – G0 voltage):
• Input – presence, switches to normal temperature (daytime) ⁄ setback (nighttime)
• Input – window contact, switches to OFF (setback) when window is open while heating, or when a dew point sensor responds in cooling operation.
• Input – changeover contact for 2-pipe systems, signals that fan coil convector is supplied with coldwater instead of hot water.
This is connected to a mechanical thermostat being installed at the water inflow.
Instead, the switchover signal can also be set remote controlled via the bus.
• Input – party button, for connecting the party button.
Upon short activation, the controller switches over from setback (nighttime) to normal temperature (daytime) for a period of 2 hours.
Afterwards it switches back to setback (nighttime).
This function overrides the timer switch programme, and itself is overridden by the window contact input.
Digital outputs
The device has four digital outputs:
The ventilator steps are either controlled automatically (upon control offset, or better via a PI controller output),
or manually (if this function is set). 1 to 3 ventilator steps can be selected in the configuration software.
Simultaneously only one switching step can be active. There is a safety pause of 1 s between switching steps.
The semiconductor relay auxiliary contact outputs DO4 and DO5 are provided for future applications.
However they can be actuated remote-controlled via the bus – Modbus address see Modbus table.
Summary of Contents for THERMASREG FM Series
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