Rev. d 01/1 5
DMP052E
FUNCTION DESCRIPTION
GENERAL
First of all it is necessary to establish the operating mode for each control loop.
The operating mode is the function to be assigned to a specific output. The output of each loop
depends on the sensor which carries out control.
For the A1 and D1 loops it is possible to set temperature sensor
ST
, whilst for A2 and D2 loops it is
possible to set either relative humidity sensor or enthalpy sensor (temperature only or both
temperature and humidity; in the latter case two controllers are needed).
A1 and D1 loops control temperature sensor
ST
for Ao1 and Rel1 outputs.
Heating control means that the output moves in an inversely proportional way with respect to the
value measured by the temperature sensor, vice versa is the meaning of cooling control.
Operating modes are:
FOR
A
NALOGUE OUTPUT 1 IT IS POSSIBLE TO SELECT:
MODE A1
: HEATING LOOP
If the output value has to increase when the control sensor
value drops under the operating set.
When the set point is achieved the output is zero.
If the control temperature drops under the SPC Heating Set
Point minus BPC Heating Proportional Band the relevant
analogue output goes to 100% equivalent to 10 Vdc
.
MODE A2
: COOLING LOOP
If the output value has to increase when the control sensor
value exceeds the operating set.
When the set-point is achieved the output is zero.
If the control temperature goes above the SPF Cooling Set
point plus BPF Cooling Proportional Band the relevant
analogue output goes to 100% equivalent to 10 Vdc.
MODE A3:
HEATING / COOLING LOOP FROM S/W
CHANGEOVER
If the Heating or Cooling Loop is enabled through the
contact input (D.i.2) in order to carry out a season
changeover. When the D.i.2 contact is open, the Loop
passes to “Heating” control type; under closed contact
the Loop passes to “Cooling” control type. The two
“Set” (SPC, SPF) and the two proportional bands (BPC,
BPF) are independent.
MODE A4:
HEATING LOOP / COOLING IN SEQUENCE
If it is required to exploit the 0-5 6-10 V control characteristic of
CONTROLLI actuators to realize a Heating Cooling sequence
with a unique 0–10 Vdc analogue output. When the set point is
achieved the output is 5,5 Vdc. If the control Temperature goes
below the Heating Set Point value (SPC) minus Heating
Proportional Band (BPC), the relevant analogue output goes to
0 Vdc. If the control Temperature goes above the value the
Cooling Set Point value (SPF) plus Cooling Proportional Band
(BPF) the relevant analogue output goes to 10 Vdc.
In this case, if a heating-Cooling sequence is required, the two actuators must be connected in
parallel to the same output selecting the range 0 – 5 Vdc with reverse action for the actuator, which
manages the heating channel, while for the actuator managing the Cooling channel, it is necessary
to select the range 6 – 10 Vdc with direct action.
