dixell XC706M User manual

Electronic Controller for
Compressor Racks
XC706M
Instructions Manual

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Operating instructions cod. 1592011000
1592011000 XC706M GB 31-08-2001 rel. 1.0 Pa. 2 / 23
INDICE
1. GENERAL WARNING _______________________________________________ 3
Please read before using this manual __________________________________________ 3
Safety Precautions_________________________________________________________ 3
2. GENERAL DESCRIPTION____________________________________________ 3
3. USER INTERFACE__________________________________________________ 4
3.1 Compressors Section ________________________________________________ 4
3.2 Displaying, setting and modifying the normal and reduced set point____________ 5
3.3 Programming ______________________________________________________ 6
3.4 How to display the status of the outputs__________________________________ 6
3.5 How to disabled an output during a maintenance session. ___________________ 6
3.6 Displaying running hours of loads_______________________________________ 7
3.7 Alarm section ______________________________________________________ 7
4. HOT KEY FOR PROGRAMMING ______________________________________ 8
4.1 DOWNLOAD (from the “Hot Key” to the instrument) ________________________ 8
4.2 UPLOAD (From the instrument to the “Hot key”) ___________________________ 9
5. LIST OF PARAMETERS _____________________________________________ 9
5.1 Configuration parameters - compressor section____________________________ 9
5.2 Operative parameters - compressors section_____________________________ 11
5.3 Relations amount parameters_________________________________________ 13
6. TYPE OF REGULATION ____________________________________________ 13
6.1 Dead band _______________________________________________________ 13
6.2 Proportional Band__________________________________________________ 14
7. MOUNTING & INSTALLATION _______________________________________ 15
8. ELECTRICAL CONNECTIONS _______________________________________ 16
8.1 Probes connection _________________________________________________ 16
9. RS485 SERIAL LINK _______________________________________________ 16
10. TECHNICAL FEATURES____________________________________________ 16
11. ALARM LIST _____________________________________________________ 17
11.1 Types of alarms and signalling managed________________________________ 17
11.2 Alarm muting______________________________________________________ 18
11.3 Alarm conditions – summary table _____________________________________ 18
12. WIRING CONNECTIONS____________________________________________ 19
12.1 Digital inputs and outputs ____________________________________________ 19
13. PARAMETERS – DEFAULT VALUES__________________________________ 21

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Operating instructions cod. 1592011000
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1. GENERAL WARNING
1.1 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.
1.2 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.
2. General description
The XC706M controller is thought to manage compressors in a system such as a pack.
The compressors can be simple, multistage or with different capacities.
Control is by means of a neutral zone or proportional band and is based on the pressure or
temperature sensed in the LP suction (compressors) circuits. A special algorithm balances the
run hours of the compressors to distribute the work load uniformly.
The controllers can convert LP pressure and display it as temperature.
The front panel offers complete information on the system’s status by displaying the suction
pressure (temperature), the status of the loads, possible alarms or maintenance conditions.
Each load has its own alarm input that is able to stop it when activated. To guarantee the total
system’s safety, there are also an input for low pressure switch: when this is activated, the
system is stopped.
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
RS485 output, using the standard ModBus RTU protocol.

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Operating instructions cod. 1592011000
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3. User interface
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The front panel of the instruments is divided in 2 parts with different colours. Each part
manages an his own function. the following sketch shows the functions:
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3.1 Compressors Section
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Keys
1. Up
It scrolls the parameter codes or increases the value of the displayed variable. Holding it
pressed will increase the speed.
2. Down
It scrolls the parameter codes or decreases the value of the displayed variable. Holding it
pressed will increase the speed.
Present only on the
XC907M and X911M

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Operating instructions cod. 1592011000
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3.
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Set
To display and modify the set point of the suction section. It displays the normal and
reduced set point in °C and bar.
To modify the value use the Up and DOWN keys.
If the N or R led is flashing, it means that the displayed set point is not active.
4.
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Prog
To access the programming mode. By pressing once the operative parameters (oPr) are
entered, by pressing twice the configuration (cnF) parameters are entered. To exit the
programming mode press the Prog key again.
5.
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MAINT
Used for displaying the state of loads: “available” or “in maintenance”.
6.
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HRS
Used for displaying the loads run times.
3.2 Displaying, setting and modifying the normal and reduced
set point
WARNING: before setting the target set points for the first time, check and, if necessary,
modify the type of freon (par. FtyP) and the default unit of measurement (par. dEU) for
compressors.
PROCEDURE
1. Set the kind of freon (FtyP par. of configuration)
2. Set the measurement unit (dEU par. of operative).
3. Check and if necessary modify the set point limits (LSE and HSE pars).
NOTE: the reduced set point is enabled by means of internal clock or digital input.
1. Press the “SET” key.
2. The normal set point will be displayed in the measurement unit pointed
out from the led (°C or bar).
3. If the normal set is operating the “N” led is lighted, otherwise the “N” led
blinks.
4. To modify the value use the “UP” & “DOWN” keys
5. To change the measurement unit press the “SET” key again.
6. To select the reduced set point, press the “SET” key again. (if it is operating the “R” led is
lighted, otherwise the “R” led blinks).
To exit: press the “SET” key till the “N” and “R” LED’s are turned off or wait for the Exit time out
(30 s).
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15

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Operating instructions cod. 1592011000
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3.3 Programming
1. Press the “PRG” key once for selecting the operative parameters (oPr);
twice for the configuration parameters (CnF).
2. Press the “UP” key and the first parameters will be displayed.
3. Press the “SET” key to see the value, use the “ UP” and “DOWN“ keys
to modify the value.
4. By pressing the “SET” key again the new value will be recorded and
the label of the next parameter will be shown.
To exit: press the “PRG” key or wait for the exit time out (30 s).
3.3.1 Security code input.
The security code prevents not qualified personnel from modifying parameters.
This feature is enabled if the parameter PSo (operative parameters) or PSc
(configuration parameters) is different from zero.
1. Press the “PRG” key once for selecting the operative parameters (oPr); twice for the
configuration parameters (CnF).
2. Press the “UP” key: the “PASS” message will be displayed.
3. Press the “SET” key: the “0” number will be displayed.
4. Insert the security code by using the UP and DOWN keys.
5. Confirm it by pressing the SET key.
6. If the security code is correct the first parameters will be displayed, otherwise the set
value keeps on being displayed. Press the UP key again to restart the procedure..
3.4 How to display the status of the outputs
1. Press the “MAINT” key
2. The LED’s of the first output start blinking and the compressor display shows the following
messages:
•onLn = output enabled
•oFLn = output disabled
for compressor with more steps the LED’s linked to the compressor (red) and the valves
(green) blink together.
3. To see the status of the following output press the UP key.
4. To exit: press the MAINT key or wait for 30 sec.
3.5 How to disabled an output during a maintenance session.
1. Press the “MAINT” key
2. The LED’s of the first output start blinking and the compressor display shows the following
messages:
•onLn = output enabled
•oFLn = output disabled
for compressor with more steps the LED’s linked to the compressor (red) and the valves
(green) blink together.
3. Select the output by pressing the UP key.
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Operating instructions cod. 1592011000
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4. Hold pressed the “CLEAR” key for more than 2 sec: the displayed message will change:
onLn Æ oFLn or oFLn Æ onLn).To exit: press the MAINT key or wait for 30 sec.
3.5.1 Output disabled signalling.
If an output is disabled his led (red and green) blinks.
3.5.2 Regulation with some outputs disabled.
If some outputs are disabled they don’t take part to the regulation, so the regulation goes on
with the other outputs.
3.6 Displaying running hours of loads
The controller memorises the running hours of each load.
To see how long a load has been working follow this procedure:
1. Press the “HRS” key
2. The HRS led of the compressors display starts flashing together with the LED’s of the
first output. The compressors display shows the running hours of the first compressor.
3. For compressors with more steps the LED’s linked to the compressor (red) and the valves
(green) blink together.
4. To see the running hours of the following load press the UP key.
5. To exit: press the HRS key or wait for 30 sec.
3.6.1 How to reset the working hours of a load.
1. Press the HRS key.
2. Select the load by pressing the UP key.
3. Hold pressed the CLEAR key (alarm section) till the display shows zero.
4. Repeat the operation for other loads
5. TO EXIT: press the HRS key or wait for 30 sec without pressing any key.
3.7 Alarm section
3.7.1 User interface
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Operating instructions cod. 1592011000
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Log
By pressing this key the alarm menu is entered. Press the UP and DOWN keys to see the
alarms happened.
•Up
Scroll the alarm list.
•Down
Scroll the alarm list
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Clear
This button has several properties linked to the time that is hold pressed and the menu of
the instrument:
Standard operating mode
1. Silence the buzzer during an alarm condition
2. Hold pressed for more than 2 seconds switch off the alarm relay during an alarm
condition
3. In the alarm menu:
a. Hold it pressed for more than 2 seconds for erase the displayed alarm.
b. Hold it pressed for more than 10 seconds for erase the whole alarm list.
4. In the “running hours” menu:
a. Hold it pressed for more than 2 seconds for erase the displayed working hours.
5. In the “status of outputs” menu:
a. Hold it pressed for more than 2 seconds for change the status of the shown
output. From off to on and viceversa
4. Hot key for programming
4.1 DOWNLOAD (from the “Hot Key” to the instrument)
1. Turn OFF the instrument.
2. Insert the “Hot Key”
3. Turn the instrument ON.
4. Automatically the parameter list of the “Hot Key” is downloaded into the instrument
memory, the “doL” message is blinking.
5. At the end the “End” message will be displayed and after 10 seconds the instrument will
restart working with the new parameters.
6. Remove the “Hot Key”.

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Operating instructions cod. 1592011000
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If the “err” message will be displayed it means that the programming failed. 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.
4.2 UPLOAD (From the instrument to the “Hot key”)
1. When the unit is ON, insert the “Hot key” and push UP key of compressor section; the
"uPL" message appears and the values of parameters will memorised on the hot key.
2. At the end of the data transfer phase the instrument displays the following messages:
“end “ for right programming.
“err” for failed programming. In this case push “SET” key if you want to restart the
programming again or remove the not programmed “Hot key”.
3. Remove the “Hot Key”.
5. List of parameters
5.1 Configuration parameters - compressor section
WARNING: after having modified one of these parameters the controller automatically
switches off and on to load the new map.
5.1.1 Plant dimensioning and type of regulation.
By means of these parameters the plant can be dimensioned according to the number and type
of compressors and the number of steps for each one.
CpnU:Compressor Number: number of compressor present in the plant. (1-6).
CtyP:Compressor type: it selects if the compressor have the same power (homogeneous) or
not.
0 = compressor with different capacities: in this case the regulation is neutral zone.
1= homogeneous: the regulation can be neutral zone or proportional band.
CPst: Compressor Steps: present only if CtyP=1: compressor homogeneous (1-6).
It is equal to the numbers of compressor valves plus one. NOTE: with 2 compressors
(CPnU=2), each with 3 steps (CPSt=3), the relays have to be connected as below:
44 45 46 47 48 49 50 51 52 53 54 55
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PC1 ..PC6 Power of compressor 1...6: for setting the power of single compressors. Available
only if CtyP=0. The power is identified by a value (range 1÷255) proportional to the
capacity of single compressor.

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Operating instructions cod. 1592011000
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E.I. 3 compressors with following capacity: 10, 20, 40 HP. The parameters have to be set
in these way: PC1=10, PC2=20, PC3=40.
rTy:Type of regulation
db = neutral zone, Pb = proportional band.
Sty:Activation: type of sequence
rt = rotation: this algorithm distributes the working time between the various loads to
ensure even run times.
F= fixed sequence: the compressors are enabled and disabled in fixed sequence: first,
second etc.
FtyP:Freon Type: set the kind of freon used in the plant
r22 = R22; r404= R404a; 507= R507; 134=134
5.1.2 Suction probe configuration
Pbc: Probe selection. Cur = 4 ÷ 20 mA probe; ntc = NTC probe.
PA04: Adjustment of read out (present only if Pbc=Cur). corresponding to 4mA input
signal, given by the suction probe (0 ÷30 Bar)
Warning: set a value correspondent to absolute pressure. If the transducer measures
relative pressure increase the range of 1 bar.
E.I. PP07 absolute pressure transducer, range 0.5÷8.0 bar. PA04=0.5; PA20=8.0.
PP30 relative pressure transducer, range: 0÷30bar. PA04=1; PA20=31.
PA20: Adjustment of read out corresponding to 20mA input signal, given by the suction
probe (0 ÷ 30.0 bar) SEE THE WARNING FOR PA04.
CAL: Suction probe calibration (-1.00÷1.00 bar; -10.0÷10.0°C)
5.1.3 Others inputs configuration
SEP: Polarity of Low pressure-switch alarm (terminals 5-6)
0=alarm with voltage absence;
1= alarm with voltage presence
rSIP: Reduced set input polarity (terminals 13-14)
0=reduced set enabled with open circuit
1= reduced set enabled with closed circuit
LLI: Liquid level input polarity (terminals 6-8)
0=alarm with voltage absence;
1= alarm with voltage presence
ALIP: Alarm input for compressors polarity
0=alarm with voltage absence;
1= alarm with voltage presence
StPP: valve outputs polarity: polarity of the outputs for capacity valves. It determines if the
state of the relays associated with the capacity valves (only for homogeneous and
stepped-capacity compressors)
0=valve enabled with open contact;
1= valve enabled with closed contact.
5.1.4 Security code
PSc:Security code to access the configurations parameters. (0÷255). With “0” the security
code is disabled