Assortment / System Description

17
Functions and characteristics
Controller
RLU..
Universal
inputs
Digital
inputs
Analog
outputs
Relay output
changeover contact
Relay output
NO contact
202 4 1 --- 1 1
220 4 1 2 --- ---
222 4 1 2 1 1
232 5 2 3 1 1
236 5 2 3 2 4
Configurable for passive or active analog signals:
LG-Ni1000, 2 x LG-Ni1000 (averaging), Pt1000, T1, DC 0...10 V.
For potential free contacts, contact sampling at DC 15 V/5 mA.
Positioning signal DC 0...10 V/1 mA.
Relay contacts for switching AC 19...265 V, 5 mA...4 A.
Universal controllers with P-, PI or PID control action can also be used as
differential controllers.
Temperature, relative or absolute humidity, pressure/differential pressure,
volumetric air flow, indoor air quality and enthalpy.
Controller can be configured as a room-supply air temperature cascade controller
with limitation of the supply air temperature.
T
T
TSu
TR
w
SpTSuC
SpTSuH
3101S38
CTLOOP 1
PI
PID
Room controller with PI, supply air controller with PID. The
result is PI+PID room-supply air temperature cascade control
with limitation of the supply air temperature
TR
TSu
SpTSuH
SpTSuH
Main control variable,
room temperature
Auxiliary control variable,
supply air temperature
Setpoint heating
Setpoint cooling
Controller types RLU202, …220, …222, …232, and …236 can be used as
sequence controllers for 2 heating (reverse acting) or 2 cooling sequences (direct
acting). RLU222, RLU232 and RLU236 have a second sequence controller with 1
heating/cooling sequence.
Individual sequences can be disabled, which applies to each controller sequence.
Each sequence has 2 outputs: Output SEQx Y (modulating) is used for the load
and output SEQx P for the pump (RLU202 without modulating output, RLU220
without pump). 2 sequences can act on a modulating output (maximum selection).
Minimum/maximum limitation with PI control action per sequence controller, either
as absolute limitation (e.g. for the supply air temperature or supply air humidity), or
as relative temperature limitation (e.g. maximum limitation of room-supply air
temperature differential).
The limitation acts on all sequences. Minimum limitation can be set to a lower
setpoint while cooling is on (example: cooling with dx cooler).
Inputs and outputs
Universal inputs
Digital inputs
Analog outputs
Relay outputs
Closed loop
control functions
Control variables
Cascade controller
Sequence controllers
Min / max limitation
Sequence limitation