Basic Functions; Probes (Analogue Inputs) - Carel MPXPRO User Manual

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5.1 Probes (analogue inputs)

Introduction
MPXPRO features a maximum of 7 analogue inputs and 1 digital input
(DI5). Analogue inputs S4, S5, S6, S7 can also be confi gured as digital
inputs, called DI1, DI2, DI3, DI4, by setting parameters A4, A5, A10, A11.
Input DI5 can only be used as a digital input, and is confi gured by
parameter A12. See the description of the terminals in paragraph 2.2. The
probes (temperature NTC, PTC, PT1000, NTCL243, 0 to 5 Vdc ratiometric
and active probes) can be connected to the analogue inputs, and have
been divided into 5 groups, with the same type of probe for each group.
See the table of parameters.
Types of probes that can be connected to each group
Group 1
Composition S1, S2, S3
Parameter for type of
/P1
probe
0 = NTC Standard

Range –50T90 °C
1 = PTC Standard

Range –50T150 °C
2 = PT1000 Standard

Range –50T150 °C
3 = NTC L243 Standard

Range –50T90 °C
4 = 0 to 5V ratiometric
-
probe
5 = 0 to 10 V input -
6 = 4 to 20 mA input -
Serial probes -
Inputs S6, S7 can be connected to 0 to 5 V ratiometric pressure probes,
remembering however that MPXPRO can only supply one ratiometric
probe. Input S7 can nonetheless also be connected to active probes
with a 4 to 20 mA or 0 to 10 V output, which cannot be powered directly
by MPXPRO. All these probes require the range of measurement to be
defi ned, set by parameters /L6, /U6, /L7, /U7. See the table of parameters.
Probe 6
Minimum value Maximum value
/L6 /U6
MPXPRO can adjust the values read by the probes. In particular, /c1 to c7
are used to increase or decrease the physical values read by the probes,
if confi gured as temperature probes. Parameter /cE, on the other hand,
corrects the value of the saturated evaporation temperature calculated
directly based on the evaporation pressure. The serial probes cannot be
calibrated, while the probes shared with the Master (such as the pressure
probe) are calibrated by the Master. To assign the functions to each
physical or serial probe, set parameters /FA,/Fb,.../Fn. See the table of
parameters.
Probe Parameter Probe
Outlet /FA
Defrost /Fb
Intake /Fc
Superheated gas
/Fd
temperature tGS
Saturated evaporation
/FE
temperature tEu
Defrost probe 2 /FF
MPXPRO - + 0300055EN rel. 1.0 30/08/10

5. BASIC FUNCTIONS

Group 2 Group 3 Group 4 Group 5
S8,S9,
S4, S5 S6 S7
S10,S11
/P2 /P3 /P4 /P5
  
  
  
  
 
-

- -

- -

- - -
Tab. 5.a
Probe 7
Minimum value Maximum value
/L7 /U7
Tab. 5.b
Parameter
Auxiliary temperature 1 /FG
Auxiliary temperature 2 /FH
Ambient temperature /FI
Ambient humidity /FL
Glass temperature /FM
Dewpoint /Fn
Tab. 5.c
One single pressure probe can be shared across the Master – Slave
network. This must be connected to the Master. On the Master, simply
correctly confi gure the using the parameters /FE, /U6, /L6, while on the
Slaves, set /FE=0 (function disabled). In this way, the Slaves automatically
search for the pressure value shared by the Master and used for
calculating the local superheat. This is used to save on the installation
costs of a pressure probe for each evaporator, assuming that the pressure
drop in that section of the line is negligible.
Probe positioning and purchase codes
The following probes are recommended by CAREL:
• evaporator outlet temperature probe: NTC***HF01;
• evaporation pressure probe:
– SPKT0013R0: ratiometric -1 to 9.3 bars;
– SPKT0053R0: ratiometric -1 to 4.2 bars;
– SPKT0033R0: ratiometric -1 to 34.5 bars.
• case ambient temperature probe: NTC***HP00;
• ambient temperature and humidity probe:
-
– DPWC111000: 4 to 20 mA;
– DPWC115000: 0 to 10 Vdc;
-
– DPWC114000: RS485 serial probe.
-
The temperature and humidity probes must not be positioned too far
from the showcases they are measuring. At times it is better to install
-
more than one if the supermarket is divided into sections with greatly
-
diff ering temperature and humidity values (frozen section, meat section,
fruit and vegetable section, etc.)
-
- • glass temperature probe: NTC060WG00. The glass temperature probe
is connected at the coldest point of the glass on the showcase, so as
to optimise operation of the anti-sweat device (heaters or fans). See
instruction sheet +050002005.
• light sensor: PSOPZLHT00. This must be installed where it can "see" the
lights in the supermarket, and not the showcase, so as to automate
day/night changeover. In the showcase it will be located in the darkest
part of the case, at the top or the bottom, based on the position of
the lights. Calibration of the night/day threshold (parameter H12),
based on the luminance in the place of installation, is the installer's
responsibility.
• For further information see the instruction sheets that can be
downloaded, even prior to purchase, from www.carel.com.
Assign probe functions (parameters /FA, /Fb, /Fc)
Par. Description
/FA Assign outlet temperature probe (Sm)
0 = Funct. disab. 6 = Probe S6
1 = Probe S1
2 = Probe S2
3 = Probe S3
4 = Probe S4
5 = Probe S5
/Fb Assign defrost temperature probe (Sd) See
/FA
/Fc Assign intake temperature probe (Sr) See /
FA
30
Def Min
1
7 = Probe S7
8 = Serial probe S8
9 = Serial probe S9
10 = Serial probe S10
11 = Serial probe S11
2
3
Sm (/FA)
Sd (/Fb)
Sr (/Fc)
Regulation probes parameters
Fig. 5.a
Max UoM
0 11 -
0 11 -
0 11 -
Tab. 5.d