Installation and User Guide
DEVIreg™ Multi
FEC | Produced by Danfoss ©
9
Common terms and abbreviations
Term
Explanation
Sensor
In this content, always a temperature sensor – NTC, PT1000, etc . .
NTC
NTC temperature sensor . NTC stands for “Negative Temperature Coefficient” . NTC sensor is
resistor with a negative temperature coefficient, which means that the resistance decreases
with increasing temperature .
PT1000
Temperature sensor . PT refers to that the sensor is made from Platinum (Pt) . 1000 refers to that at 0°C
sensor has a resistance of 1000 Ohms (Ω) . Sensor has Positive Temperature Coefficient (PTC) .
RTC
Real Time Clock
BMS
A building management system (BMS), is a computer-based control system installed in build-
ings that controls and monitors the building’s mechanical and electrical equipment such as
ventilation, lighting, power systems, fire systems, and security systems .
RS-485
RS-485 or RS485, also known as TIA-485(-A) or EIA-485, is a standard defining the electrical
characteristics of drivers and receivers for use in serial communications systems .
RCD
Residual-current device
CMR
Current Monitoring Relay
NO
Normally Open relay . Has an initial opened circuit state when no current is applied to its coil
so basically the internal switch disconnects the power to the load in the inactive state .
NC
Normally Close relay . Has an initial closed-circuit state when no current is applied to its inter-
nal coil therefore the internal switch connects the power to the load . When voltage is applied
to the coil of the NC relay the internal switch goes to the open position and disconnects the
power from the load .
MCX
Danfoss Programmable Controller .
DEVIreg™ Multi
is based on MCX08M2 controller
