G
THERM
ASREG
®
FM 020
THERMASREG
®
FM 020 is a communicative built-in controller for temperature control of climate control convectors, or heating or venti-
lation devices. It is provided with four analog outputs, four digital inputs (presence, window contact, party button, two-pipe system moni-
toring), and four digital outputs (assignment schedule see datasheet). It can either be operated independently, or in connection with a
superior control device (SPS ⁄ DDC or Soft SPS), a building management system (e.g. RcWare Vision), or another monitoring, control and
data acquisition system being applicable as Modbus master. For manual intervention and room temperature measurement, an analog
room unit is used, for example our RTF_PT1000_D5.
TECHNICAL DATA:
Power consumption: .................. 24 V AC (± 10 %)
700 mVA + peripheral devices (ca. 5 VA)
Inputs:........................................... 4 x DI for one potential-free contact,
24 V AC, 15 mA (presence, window contact,
changeover switch, party mode)
4 x AI 20...1600 ohm (room temperature, setpoint,
ventilator step, reserve)
Outputs: ....................................... 2 x semiconductor relay for AC load, zero switching,
24 V AC, max. switching current 0.4 A
2 x two-way thyristors (TRIAC),
24 V AC, max. switching current 0.4 A,
recommended thermal actuators are
Siemens STA71, Danfoss TWA (24 V types)
3 x relay 230 V ⁄ 5 A (3 ventilator steps)
2 x AO 0 ...10 V, max. output current 10 mA,
short circuit current limitation to 20 mA.
Load (analog outputs): ............... 10 kOhm, max. current 10 mA,
outputs short-circuit proof, limited to 20 mA
Communication: .......................... with room devices:
RS485 – Modbus RTU, 9600, N, 8, 1, master
with the building management system:
RS485 – Modbus RTU, 9600, N, 8, 1, slave
Dimensions: ................................. 113 x 90 x 24 mm (with retainer)
Electrical connection: ............... 0.14 - 1.5 mm
2
via screw terminals
Installation: .................................. by 2 screws, DIN top hat rail adapter optional
Protection class: ........................ II (according to EN 60 730)
Protection type:.......................... IP 20 (according to EN 60 529)
Standards: ................................... CE conformity, electromagnetic compatibility according to EN 61 326 + A1 + A2,
EMC directive 89 ⁄ 336 ⁄ EEC, low-voltage directive 73 ⁄ 23 ⁄ EEC
FUNCTION:
The controller communicates with an analog room unit (which comprises a Pt1000 temperature sensor, setpoint adjustment, and ventila-
tor steps switching) in rooms, for which UI... room devices with display are not applicable.
Alternatively (not available in this firmware version), a communicative room device can be used via an assigned bus (K2+, K2-). The room
unit detects the room temperature. Setpoint adjustment via turning knob and taking over of default control signal into the operating mode
by shortly pressing the knob, or via the menu. The room temperature is measured in the range form – 20 °C to + 50 °C.
The detected and the input values are processed by a PI-algorithm. At the output, 0...10 V signals for analog actuators as well as pulse
width modulated 24 V AC signals for two-way thyristors (PWM TRIAC) for activating thermal actuators are output.
These controllers are intended for operation in a normal and chemically non-aggressive environment. They do not require any mainte-
nance or servicing. They are mounted with two screws to a flat surface, e.g. on the fan coil convector body, or on an installation plate. The
retainers can be removed and an optionally available DIN top hat rail adapter can be attached at the bottom of the controller.
The controller includes a real-time clock with a week programme time switch (6 switching events per day). That switches over between
3 operating modes: normal temperature, temperature setback, and OFF. The controller has two digital inputs, one for a presence detec-
tor (access card reader, passive infrared sensor, etc.) and one for a window contact or dew point sensor (switches to OFF). Both contacts
can be used as breaker or normally open contacts. The selection is made via configuration software.
Three LEDs indicate correct functioning:
Green (PWR) fan power supply OK
Red (TX1) – data transmission to the building automation bus
Red (TX2) – data transmission to the room unit
Inside on the circuit board are four DIP switches:
2 x K1 Bus End, Reserve, and INIT to set the ex-factory default settings.
The controller communicates with the central building control system via a RS485 bus with Modbus RTU and therefore, can be applied in
connection with various control systems. See variables list (Modbus table) in the separate document Room devices and Controllers,
transmission protocol. Another bus K2 communicates with the room unit. Configuration software is used for configuration and commis-
sioning of this device, which can be downloaded at www.spluss.de free of charge.
Summary of Contents for THERMASREG FM 010
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