dIXEL XC450D User manual

dIXEL
Operating instructions
1592001620
1592001620 XC450D GB R1.0 10.07.2009 XC450D 1/3
SAFETY STEP CONTROLLER
XC450D
GENERAL WARNING
PLEASE READ BEFORE USING THIS MANUAL
This manual is part of the product and should be kept near the instrument for easy and
quick reference.
The instrument shall not be used for purposes different from those described
hereunder. It cannot be used as a safety device.
Check the application limits before proceeding.
SAFETY PRECAUTIONS
Check the supply voltage is correct before connecting the instrument.
Do not expose to water or moisture: use the controller only within the operating limits
avoiding sudden temperature changes with high atmospheric humidity to prevent
formation of condensation.
Warning: disconnect all electrical connections before any kind of maintenance.
The instrument must not be opened.
In case of failure or faulty operation send the instrument back to the distributor or to
“DIXELL S.r.l.” (see address) with a detailed description of the fault.
Consider the maximum current which can be applied to each relay (see Technical
Data).
Ensure that the wires for probes, loads and the power supply are separated and far
enough from each other, without crossing or intertwining.
Fit the probe where it is not accessible by the end user.
In case of applications in industrial environments, the use of mains filters (our mod.
FT1) in parallel with inductive loads could be useful.
GENERAL DESCRIPTION
XC450D is a safety step controller with 3 setps
that excludes the main regulator when it has a
fault. It detects the compressor status by a free
voltage digital input that is activated after a
settable delay. It manages a relay that
excludes the main regulator of the compressor
rack and starts the safety regulation. It is
provided with pressure transducer input, 4÷20
mA, while the regulation is performed by three
relays.
It has a HP digital input, and a liquid level
digital input both of them free voltage,
Furthermore the safeties of each compressor
can be connected to a dedicated free voltage
digital inputs.
By means of the HOT KEY the controller can
be easy programmed at power on.
The controller can be connected to the XJ500,
controlling and monitoring system, thanks to
the serial TTL output, using the standard
ModBus RTU protocol.
TECHNICAL FEATURES
Housing: Self extinguishing ABS.
Case: 4 DIN modules 70x85 mm; depth 61mm
Mounting: DIN RAIL
Protection: IP20
Display: upper display 3 digits with d.p. lower display 4 digits with d.p.
Connections: Screw terminal block 2,5 mm2heat-resistant wiring.
Power supply: 120Vac 10%,50-60Hz or 230Vac 10%,50-60Hz or 24Vac
Power absorption: 5VA max; Probe input: for 4÷20mA signals.
Digital inputs: 6 free voltage.
Data storing: on the non-volatile memory (EEPROM).
Relay outputs: 6 relays SPDT 8(3) A, 250Vac.
Operating temperature: 0÷60 °C.; Storage temperature: -30÷85 °C.
Relative humidity: 2085% (no condensing).
Measuring range: -40÷110 °C (- 40÷230 °F) or 4÷20mA;
Resolution: 0.1 °C or 1°F (selectable);
Accuracy (ambient temp. 25°C): ±0,7 °C ±1 digit.
WIRING CONNECTIONS
Probes
4-20mA: use terminals 9(+) 11(in)
MOUNTING & INSTALLATION
MOUNTING
The XC450D shall be mounted on an omega DIN rail. The temperature range allowed for
correct operation is 0÷60 °C. Avoid places subject to strong vibrations, corrosive gases,
excessive dirt or humidity. The same recommendations apply to probes. Let air circulate by
the cooling holes.
ELECTRICAL CONNECTIONS
The controller is provided with screw terminal blocks for wires having section not bigger
than 2.5 mm2.
Check power supply data before connection wires.
Keep the probe and the digital input wires separate from the power cable.
Do not exceed the maximum rating current for each relay, check technical data and if the
load is bigger, use filtered contactors.
Before connecting cables make sure the power supply complies with the instrument’s
requirements. Separate the input connection cables from the power supply cables, from
the outputs and the power connections. Do not exceed the maximum current allowed
on each relay, in case of heavier loads use a suitable external relay.
PRESSURE TRANSDUCERS
Pressure probe (4 - 20 mA): respect the polarity. If using terminal ends be sure there are
no bear parts which could cause short circuiting or introduce noise disturbance at high
frequencies. To minimise the induced disturbances use shielded cables with the shield
connected to earth.
RS485 SERIAL LINE
All models can be integrated into the WEB monitoring and supervising systems using the
TTL serial port. They use the standard ModBus RTU protocol, so they can be fitted in a
system integrator using this protocol. Check the product library presence if the version is
previous to this model.
XJ485CX INTERFACE
Interface: XJ485CX
Colour: orange
Code: XJ485CX-00000 + CAB/RS 0.2MT
(with 20cm cable).
USER INTERFACE
Upper display: OFF when the regulation
is disabled. Pressure probe value during
regulation mode.
Lower display: delay time when the digital
input is ON.
1-2-3 Icons: loads output if set as
compressor. Flashing with call delay.
°C /°F: temperature value
Bar/Kpa/PSI: pressure value
Spanner: maintenance menu for
loads time
Open book: alarm storing
Alarm is happening

dIXEL
Operating instructions
1592001620
1592001620 XC450D GB R1.0 10.07.2009 XC450D 2/3
KEYBOARD
SET to see or modify the pressure set point (ON only during regulation mode) and for
parameters.
n(GIÙ) by holding it pressed for 3s, the regulation is enabled or disabled; it decreases
the displayed values.
o(SU) to enter the alarm menu; it increases the displayed values.
eCLOCK to enter the maintenance menu.
KEY COMBINATIONS
o+ n To lock and unlock the keyboard.
SET + nTo enter the programming mode.
SET + oTo exit the programming mode or the alarm menu.
FUNCTIONING DURING OFF STATUS
When the display is OFF, the controller checks only the LL liquid level alarm, the P1
pressure transducer status if absent, broken or when the pressure is out of scale.
REGULATION
HOW TO SET THE PRESSURE SET
Instrument in regulation mode (Regulation ON: push for 3sec
the DOWN key)
1) Push and release the SET key.
2) The Lower display will show the “SEtC” label, the
Upper display will show the pressure value.
3) To change the Set value push the o or n.
4) To memorise the new value push and release the SET
key within 30s.
(Regulation stop: push for 3sec the DOWN key)
HOW TO LOCK AND UNLOCK THE KEYBOARD
1. Keep pressed for more than 3 s the [oand n] keys. The
“POF” message will be displayed and the keyboard will be
locked.
2. At this point it will be possible only to see the set point, enter
the alarm menu, see the alarm and hours menu.
3. Keep pressed together for more than 3s the [oand n] keys
to unlock the keyboard, till the “Pon” message will be
displayed.
MESSAGES AND ALARMS
Code Description Cause Action Reset
OFF Controller in
stand by
“By pass” digital input
de-activated
P1 P1 probe
failure alarm Probe f
ailure or out of
range
The compressor
outputs
are activated according
to CPP, SPr o PoPr
parameters
Automatically
as soon as the
probe restarts working.
EA1
EA2
EA3
Input safeties
alarm
The corresponding
digital input is turned
on.
The corresponding outp
ut
is turned off.
Automatically as soon as the
digital input is turned off.
LA Minimum
suction alarm
Pressure lower than
[SetC – LAL]
value
afterthetAo delay Signalling only
Automatically:
as soon as the
pressure or temperature reaches
the SetC-LAL+ differential value
(0.3bar o 1°C)
HA Maximum
suction alarm
Pressure higher than
[SETC+HAL]
value
afterthetAo delay Signalling only
Automatically:
as soon as the
pressure or temperature reaches
the (SetC+HAL -differential) value
(0.3bar o 1°C)
Pon Keyboard
unlocked Press together for
3”
the UP+DOWN keys Press together for 3”
the
UP+DOWN keys
The POF
message will be
displayed and the keyboard will be
locked
PoF Keyboard
locked Press together for
3”
the UP+DOWN keys
Press together for 3” the
UP+DOWN keys
The “POn
” message will be
displayed and the keyboard will be
unlocked
A12 Wrong
configuration
Wrong programmation
of some resources Parameters check Automatic
PARAMETERS PROGRAMMING
TO ENTER THE Pr1 PARAMETER LIST: Hold pressed the
[SET + n]key for 3 s.
TO ENTER THE Pr2 PARAMETER LIST:
Select with the [n] key the Pr2 parameter and press the SET
key.
1) The flashing value “0 --” is displayed on the upper display.
2) Insert the password 321 using the oand nkey and
press SET.
To exit: Press SET + UP or wait 30s without pressing a key.
NOTE: the set value is stored even when the procedure is
exited by waiting the time-out to expire.
HOW TO CHANGE PARAMETER VALUES
1. Enter the Programming mode.
2. Select the required parameter with oor n.
3. Press the “SET” key the value start blinking.
4. Use oor nto change its value.
5. Press “SET” to store the new value and move to the following parameter.
HOW TO USE THE HOT KEY
HOW TO PROGRAM A HOT KEY FROM THE INSTRUMENT (UPLOAD)
1. Program one controller with the front keypad.
2. When the controller is ON, insert the “Hot key” and push okey; the "uPL"
message appears followed a by flashing “End”
3. Push “SET” key and the End will stop flashing.
4. Turn OFF the instrument remove the “Hot Key”, then turn it ON again.
NOTE: the “Err” message is displayed for failed programming. In this case push again o
key if you want to restart the upload again or remove the “Hot key” to abort the operation.
HOW TO PROGRAM AN INSTRUMENT USING A HOT KEY (DOWNLOAD)
1. Turn OFF the instrument.
2. Insert a programmed “Hot Key” into the 5 PIN receptacle and then turn the
Controller ON.
3. Automatically the parameter list of the “Hot Key” is downloaded into the Controller
memory, the “doL” message is blinking followed a by flashing “End”.
4. After 10 seconds the instrument will restart working with the new parameters.
5. Remove the “Hot Key”.
NOTE the message “Err” is displayed for failed programming. In this case turn the unit off
and then on if you want to restart the download again or remove the “Hot key” to abort the
operation.
The unit can UPLOAD or DOWNLOAD the parameter list from its own E2 internal memory
to the “Hot Key” and vice-versa.
LIST OF PARAMETERS
PLANT DIMENSIONING AND TYPE OF REGULATION
oA4, oA5, oA6 Configuration of 3 relays:
Each relay according to the configuration of the oA4, oA5 and oA6 parameter can work
as:
1 cPr Compressor
2 StP Compressor valve
3 FAn Fan Not used
4 ALr Alarm
5 nu Not used Not used
6 Lin Not used Not used
7 Ali Only liquid alarm Not used
8 Man Manual regulation Not used
PLANT CONFIGURATION EXAMPLE:
Plant with 3 compressors:
[oA1 = Liq,] fixed
[oA2 = Man] fixed
[oA3 = nu] fixed
oA4 = Cpr,
oA5 = Cpr,
oA6 = Cpr.
rty: Type of regulation: db = neutral zone, Pb = proportional band.
Sty: Activation type of sequence for compressors: YES = rotation: this algorithm
distributes the working time between the various loads to ensure even run times. no =
fixed sequence: the compressors are enabled and disabled in fixed sequence: first,
second etc.
PRESSURE TRANSDUCER
PA04 Pressure value corresponding to 4 mA (0 ÷ PA20 bar). Minimum transducer
pressure value (absolute value).
PA20 Pressure value corresponding to 20 mA for probe 1 (PA04÷51.0 bar).
Maximum pressure value (absolute value).
CAL Suction pressure calibration (-12.0÷12.0 bar).
!PAY ATTENTION TO THE TRANSDUCER SETTING!
The instrument automatically converts the pressure into relative pressure.
For PP07 pressure transducers (-0,5÷7.0bar or 0.5..8.0bar) is set [PA04=0.50 and
PA20=8.00] and for PP11 pressure transducers (-0,5÷11.0bar or 0.5..12.0bar) is
[PA04=0.50 e PA20=12.00], with 0÷30bar pressure transducer is [ PA04=1 e PA20=31].
DIGITAL INPUT CONFIGURATION
i1C Liquid alarm polarity: oP: the digital input is activated by opening the contact;
CL: the digital input is activated by closing the contact.

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. When 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. When 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
DOWN key for 3s. Compressors depends on th SetC and Pbd parameters.
- RESET REGULATION ON: turning off and on the controller, or with DOWN 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.
When 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 onlyif 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 Typeof 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 Proportionalband 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 delaybetween the insertion of two
different compressors 0 ÷ 99.5 min.( res. 10 “)
doF 0,1 Pr2 Time delaybetween 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 relayoutput polarity oP ÷ cL
OTHER
oFF Yes Pr2 Switching ON/OFF enabling from keyboard no / YES
Ad1 1 Pr2 Serialaddress 1 ÷ 247
rEL - Pr2 Release micro readable only
Ptb - Pr2 Parameter table code readable only
Pr2 Pr1 Password protected menu readable only