User manual

µC
2
SE process chiller +030220416 - rel. 2.2 - 25.01.2013
5 FUNCTIONS
5.1 Set point
The control algorithm is the ON/OFF type according to the figure. The set point r01
can be set from a minimum value to a maximum value (par. r13, r14). The probe
selected for the control depends on parameter r06, once enabled with the
parameters /01 and /02. If r06 = 0,1 the probe is B1. If r06 = 2, 3, 4 the control
probe is B2. A second set point value can be set from external digital input (par.
r21). Instead, setting B3 or B4 as differential control probe, the relative set point
control is activated, in which the set point becomes r01 plus the value read by
probe B3 or B4.
For the explanation of the functions relative to the compressors, see par.
6.4.7.
5.2 Probes (analogue inputs)
The probe parameters allow to:
• set the type and function of the probe;
• set the offset for the correction of the reading (calibration);
• set the maximum/minimum voltage input;
• activate a filter to stabilize the measurement.
The probes B1/B2 have the function of input/output evaporator temperature. The
probe B3 can be configured as condensation temperature probe, external or
differential control. The external probe allows the activation of the external
compensation algorithm. The probe B4 can have the same functions as B3 and in
addition acts as digital input (can be configured from par. P13). In this case, the
condenser probe is ratiometric.
Parameters /09, /10, /11, /12 establish the work range of the ratiometric probe.
Example:
Input 0…4.5 Vdc on B4, /09=0, /10 = 4.5 V dc, /11 = 5, /12 = 10, /16=0
B40
Display
visualization
(/16=0)
4,5V
10
5
7,5
Therefore 5 will be displayed in correspondence with 0 V and 10 will be displayed
in correspondence with 4.5 V. These are also the values on the basis of which
control takes place.
Par. Description
Def Min Max U.M.
r01 Set poin
t
12 r13 r14 °C/°F
r02 Differential 3 0.1 50 °C/°F
r06 Type of regulation/compressors use
0 = Proportional input
1 = Proportional input + neutral zone
2 = Proportional output
3 = Proportional output + neutral zone
4 = Timed output with neutral zone
0 0 4 -
r13 Minimum se
t
point -40 -40 r14 °C/°F
r14 Maximum se
t
point 80 r13 176 °C/°F
r21 Set point from external contac
t
12 r13 r14 °C/°F
r45 Relative control maximum se
t
poin
t
30 r46 176 °C/°F
r46 Relative control minimum se
t
poin
t
10 -40 r45 °C/°F
P08/P09/
P34
Digital input selection ID1/ID2/ID5
13=2
nd
Set point
0 0 23 -
r01
B1/ B2
ON
r02
OFF
r01 + B3 or
r01 + B4
B1/ B2
ON
r02
OFF
r45 r46
Key
r01 Set poin
t
r02 Differential
B1/B2 Evaporator input/output probe
B3/B4 Differential control probe
Par. Description
Def Min Max U.M.
/01 Probe B1
0/1 = Absent/present
1 01-
/02 Probe B2
0/1 = Absent/present
1 01-
/03 Probe B3
0 = Absent
1 = Condenser NTC
2 = External NTC
3 = Differential control
0 03-
/04 Probe B4
0 = Absent
1 = Digital input
2 = External NTC
3 = Ratiometric Condenser
4 = Differential control
0 04-
/09 Minimum
v
oltage input value
50
0/10
V
dc/100
/10 Maximum
v
oltage input value
450
/09 500
V
dc/100
/11 Minimum pressure value
0
0/12ba
r
/12 Maximum pressure value
34,5
/11 99,9 ba
r
/13 Probe B1 calibration
0
-12 12 °C/°F
/14 Probe B2 calibration
0
-12 12 °C/°F
/15 Probe B3 calibration
0
-12 12 °C/°F
/16 Probe B4 calibration
0
-12 12 °C/°F
/bar
/21 Digital filte
r
4
115-
/22 Input limitation
8
115-
17