dIXEL
Operating instructions
1592001620
1592001620 XC450D GB R1.0 10.07.2009
XC450D
3/3
did
LL liquid alarm delay:
0 ÷ 255 min. Delay between the detection of the LL
liquid alarm condition and its signalling.
iP4
Alarm stop polarity from pressure switch: oP
: the digital input is activated by
opening the contact;
CL
: the digital input is activated by closing the contact.
iP5
By-pass input polarity:
oP
: the digital input is activated by opening the contact;
CL
: the digital input is activated by closing the contact.
ALIP
Alarm input for compressors and fans polarity
oP
: the digital input is activated by opening the contact;
CL
: the digital input is activated by closing the contact.
COMPRESSORS REGULATION
Pbd
Proportional band or neutral zone width
(0.10÷10.0 bar). The band (or zone)
is symmetrical compared to the target set point, with extremes: SET-Pbd/2 and
SET+Pbd/2.
Onon
Minimum time between 2 following switching ON of the same compressor
(0÷255min).
oFon
Minimum time between the switching off of a compressor and the
following switching on
(0÷255min)
don
Time delay between the insertion of two different compressors
(0÷99.5
min; ris. 10s).
doF
Time delay between switching off of two different compressors
(0÷99.5
min; ris. 10s).
odo
Count time with by-pass input ON
(0÷255min)
LSE
Minimum set point for compressors.
HSE
Maximum set point for compressors
.
ALARMS – COMPRESSOR SECTION
PAo:
Alarm probe exclusion at power on.
it is the period starting from instrument
switch on, before an alarm probe is signalled. (0÷255 min). During this time if the
pressure is out of range all the compressor are switched on.
LAL
:
Low pressure (temperature) alarm
: The measurement unit depends on dEU
parameter. It’s always subtracted to the set point. W hen the value
SET-LAL
is
reached the A03C alarm is enabled, (possibly after the
tAo
delay time).
HAL
:
High pressure (temperature) alarm
: The measurement unit depends on dEU
parameter. It’s always added to the set point. W hen the value SET+HAL is
reached the A04C alarm is enabled, (possibly after the
tAo
delay time).
tAo
:
Low and High pressure (temperature) alarms delay
: (0÷255 min) time
interval between the detection of a pressure (temperature) alarm condition and
alarm signalling.
SPr
:
Number of steps engaged with faulty probe
. (0÷#compr).
OTHER
tbA
Alarm relay silencing:
by pushing one of the keypad buttons.
no
= alarm relay
stays on;
yES
=
alarm relay is switched off by pushing any keys.
OAP
Alarm relay output polarity: cL=
closed when activated;
oP=
opened
when
activated
oFF
Switching ON/OFF enabling from keyboard:
(
no
= disabled;
yES
= enabled)
It permits the switching ON/OFF of the instrument by pressing the SET key for
more than 4s.
Ad1
:
Compressors address
(1 –247) It is used in monitoring system.
Ad2
:
Fans address
(1 –247) It is used in monitoring system.
Ptb
Parameter table code
: readable only.
rEL
Software release
for internal use.
Pr2
Access to the protected parameter list
(read only).
TYPE OF REGULATION
- OFF:
the instrument doesn’t make the regulation; it detects the LL liquid alarm and the
P1 broken transducer.
- REGULATION ON:
when the digital input is activated or set manually by pushing the
DOW N key for 3s. Compressors depends on th SetC and Pbd parameters.
- RESET REGULATION ON:
turning off and on the controller, or with DOW N key during
3”.
Functioning mode:
rtY=db neutral zone
: If the pressure (temperature) is inside this zone the controller
maintains the same number of loads switched on and off, without changing anything.
W hen the pressure (temperature) go out from the zone, regulation starts.
rtY=Pb proportional band
: The regulation band (Pbd) is divided into as many parts
as there are stages. The numbers of stages switched ON is proportional to the value
of the input signal: when this distances itself from the target set point and enters the
various bands, the compressors are switched ON, to be then turned OFF when the
signal brings near the set point. In this way if the pressure is greater than regulation
band, all the compressors are on, if the pressure (temperature) is lower than the
regulation band all the compressors are off.
SAFETY TIMES
A load is turned ON only if the safety times onon, oFon, donF are over.
Regulation stops when the pressure (temperature) come back into the neutral zone.
CONFIGURATION AND ALARM DIAGNOSTICS
DIGITAL INPUTS FOR COMPRESSOR SAFETY
ALIP:
It establishes if the input is activated by closing (ALIP=cL) or by opening (ALIP=oP)
the id1, id2, id3 contacts.
Actions
Every time one input is activated the corresponding output is turned off.
P1 probe failure alarm
It is generated by failure in the transducer.
SPr
: number of steps engaged with faulty probe.
It is an alarm signal with the activation of: relay, buzzer and P1 and P2 code display.
Recovery
Automatic as soon as probe restarts working.
HA, LA: LA2 High and low pressure (temperature) alarms
This alarm signals that the pressure (temperature) is out of limits established by
parameters LAL – SetC+ HAL.
The
tAo
and
AFd
parameters set the delay between alarm condition and alarm signalling.
Action
The alarm is signalled with standard action. The outputs are unchanged.
ALARM MUTING
Press any buttons to silence the buzzer during an alarm condition.
Hold pressed for more than 3 seconds switch off the alarm relay during an alarm condition
PARAMETERS – DEFAULT VALUES
Name
bar Level Description
Range
SEtc
3.0 --
Set Point for pressure
LSE ÷ HSE
oA4
Cpr Pr2
Output 4 configuration
cPr / FAn / StP / ALr / Lin /
nu/Liq/MAn
oA5
Cpr Pr2
Output 5 configuration
cPr / FAn / StP / ALr / Lin /
nu/Liq/MAn
oA6
Cpr Pr2
Output 6 configuration
cPr / FAn / StP / ALr / Lin /
nu/Liq/MAn
rtY
db Pr2
Type of regulation
db, pb
StY
yES Pr2
Compressor rotation
no / YES
PA04
0,5 Pr2
Adjustment of read out for the Probe at 4mA
0.0 bar ÷ PA20
PA20
8,0 Pr2
Adjustment of read out for the Probe at 20mA PA04 ÷ 51.0 bar
cAL
0 Pr2
Probe 1 calibration
-12.0 ÷ 12.0
DIGITAL INPUTS
i1C
CL Pr2
Liquid alarm polarity
oP / cL
did
60 Pr2
Liquid alarm signalling delay
0 ÷ 255 min.
iP4
CL Pr2
Alarm stop polarity from pressure switch
oP / cL
iP5
CL Pr2
By-pass input polarity
oP / cL
ALiP
CL Pr2
Alarm input for compressors and fans polarity
oP / cL
REGULATION
Pbd
0.6 Pr2
Proportional band of compressors
> 0 ÷ 10.0 bar
onon
5 Pr2
Minimum time between 2 following switching
ON
0 ÷ 255 min.
oFon
2 Pr2
Minimum time between the switching off and
on
0 ÷ 255 min.
don
0,3 Pr2
Time delay between the insertion of two
different compressors
0 ÷ 99.5 min.( res. 10 “)
doF
0,1 Pr2
Time delay between switching off of two
different compressors
0 ÷ 99.5 min. (res.10”. )
odo
10 Pr2
Regulation delay on start-up
0 ÷ 255 minuti
LSE
0,5 Pr2
Minimum set point for compressors
PA04 ÷ HSE
HSE
4,0 Pr2
Maximum set point for compressors
LSE ÷ PA20
PRESSURE ALARMS
PAo
30 Pr2
Alarm probe exclusion at power on
0 ÷ 255 min.
LAL
10 Pr1
Low pressure (temperature) alarm –
compressor section
> 0 ÷ 30.0 bar
HAL
10 Pr1
High pressure (temperature) alarm–
compressor section
> 0 ÷ 30.0
tAo
10 Pr1
Low and High pressure (temperature) alarms
delay– compressor section
0 ÷ 255 min.
SPr
2 Pr2
Number of steps engaged with faulty probe
0 ÷ oA6
tbA
no Pr2
Alarm relay silencing
no / YES
OAP
cL Pr2
Alarm relay output polarity
oP ÷ cL
OTHER
oFF
Yes Pr2
Switching ON/OFF enabling from keyboard
no / YES
Ad1
1 Pr2
Serial address
1 ÷ 247
rEL
- Pr2
Release micro
readable only
Ptb
- Pr2
Parameter table code
readable only
Pr2
Pr1
Password protected menu
readable only
