User manual

µC
2
SE process chiller +030220416 - rel. 2.2 - 25.01.2013
To change the function of the other outputs, operate on the following parameters.
5.6 Analogue outputs
The analogue output Y1 is set-up for the condenser fan and is active if F01 = 1. In
systems with hot gas bypass function enabled, the bypass valve is commanded by
the output Y1 (controller) or Y2 (I/O expansion board). See the control chapter.
5.7 Compensation
The compensation can indifferently increase or decrease the value of r01
depending on whether r17 is respectively positive or negative.
r01 varies only if the external temperature (e.g.B3) exceeds r19:
- if B3 is over r19 there will be: r01 effective = r01 + (B3-r19)*r17
- if B3 is lower than r19: St1 effective = St1
5.8 Low load
In the systems with reduced water content, a storage tank must be provided, so
that there are no continuous and rapid temperature changes in the cooled water
following control intermittence. In this way, the number of compressor hourly
switch-ons/offs is limited to an acceptable number. The storage tank can be
eliminated in low load conditions.
Low load condition:
1. only one compressor is active;
2. the compressor is switched off after an operating period less than the
value of parameter r28.
r28 therefore represents the minimum operating time of the compressor, below
which the low load condition is determined. The compressor will analyse the low
load status every time the compressor is switched off. If already in low load state,
the time considered by the controller for the new analysis becomes r28xr29: r02”.
H11
0 1 2 3 4 5 6
NO1 compressor 1 compressor 1 compressor 1 compressor 1 compressor 1 compressor 1 compressor 1
NO2 heater 1 heater 1 heater 1 - - heater 1 heater step 1
NO3 evaporator pump evaporator pump evaporator pump evaporator pump evaporator pump evaporator pump -
NO4 - compressor 2 (or
compressor 1
partialization)
compressor 2
(or compressor 1
partialization)
compressor 2
(or compressor 1
partialization)
compressor 2
(or compressor 1
partialization)
condenser fan -
NO5 alarm alarm - alarm alarm alarm alarm
7 8 9 10 11 12
NO1 compressor 1 compressor 1 compressor 1 compressor 1 compressor 1 compressor 1
NO heater step 1 heater 1 step compressor 2 compressor 2 compressor 2 P25
NO3 - - - - - P26
NO4 heater step 2 condenser fan - heating step 1 heating step 1 P27
NO5 alarm alarm alarm alarm alarm P28
Par. Description
Def Min Max
UM
P21 Alarm relay output logic
0/1=Normally unexcited/excited
0 0 1 -
P25 Digital output 2
0 = No function
1 = Compressor 2
2 = Anti-freeze heater/support 1
3 = Do not select
4 = Pump/condenser fan
5, 6, 7 = Do not select
8 = Condenser fan on/off
9 = Anti-freeze heater/support 2
10 = Alarm
11 = Do not select
0 0 11 -
P26 Digital output 3
See P25
0 0 11 -
P27 Digital output 4
See P25
0 0 11 -
P28 Digital output 5
See P25
0 0 11 -
P42 Digital output 11
0 = Not used
1…5 = Ad1…Ad5
6 = High pressure alarm
7 = Do not selec
t
8 = Low pressure alarm
9 = Do not selec
t
10 = Circuit 1 thermal overload
11 = Do not selec
t
12 = Flow switch alarm
13 = Low temperature alarm
14 = High temperature alarm
15 = Low temperature alarm at start-up
16 = High temperature alarm at star
t
-up
17 = Pump overload
18 = Do not selec
t
0 0 18 -
P43 Digital output 12
See P42
0 0 18 -
P44 Digital output 13
See P42
0 0 18 -
P45 Digital output 14
See P42
0 0 18 -
P46 Digital output 15
See P42
0 0 18 -
Par. Description
Def Min Max U.M.
r01 Set-poin
t
12 r13 r14 °C/°F
r17 Compensation constan
t
0 = no compensation
0 -5 5 -
r18 Maximum distance from the set-poin
t
0,3 0,3 20 °C/°F
r19 Start compensation temperature 30 -40 176 °C/°F
r01
r19
B3
r01+r18
r01-r18
r17=2
r17= +0,5
r17= -0,5
r17= -2
r01_comp
Key
r01_comp Compensated se
t
-poin
t
19