1592001520 XC10CX - XC30CX GB rel1.0 08.08.2012 XC30XC 1/4
Digital controller for CDU management
XC10CX and XC30CX
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.
• Dixell Srl reserves the right to change the composition of its products, even without notice,
ensuring the same and unchanged functionality.
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.
• Fit the probe where it is not accessible by the End User. 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.
• 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
Model XC30CX, format 32x74mm, is a digital thermostat for condensing unit applications. It provides
three digital (relay) outputs, one for the compressor and the other ones to control the fans. It is also
provided with 2 NTC or ratiometric probe inputs, to be used on the suction and condenser line. Several
digital inputs can operate to manage the condensing unit safeties. The HOT-KEY output allows to
program the controller by means the HOT-KEY programming key. The instrument is fully configurable
through special parameters that can be easily programmed through the keyboard.
Model XC10CX differs from the XC30CX on the digital output number. In fact, the XC10CX has only
one digital output, which is used to control the compressor.
3. CONTROLLING LOADS
3.1 COMPRESSOR
The regulation is performed according to
the pressure measured by the suction
probe P1.
The compressor cut in is give by the Cin
parameter.
The compressor cut out is give by the
Cou parameter.
Time
Press.
Compr.
COU
ON
In case of fault in the regulation probe the start and stop of the compressor are timed through
parameters Con and CoF.
3.2 FAN MANAGEMENT (ONLY FOR XC30CX)
The XC30CX is able to control 1 or 2 condenser fans.
A direct regulation is performed (cooling). It depends on the parameters:
SF1
Set point for fan1 (with NTC probe: -40°C to SF2 or 40°F to SF2; with pressure probe:
P2i to SF2 bar/PSI/kPA)
HF1
Differential for fan 1 (0.1 to 10.0°C/bar; 1 to 100°F/PSI)
SF2
Set point for fan2 (with NTC probe: SF1 to 110°C or SF1 to 230°F;
with pressure probe: SF1 to P2E bar/PSI/kPA)
HF2
Differential for fan 2 (0.1 to 10.0°C/bar; 1 to 100°F/PSI/kPA)
A fan is switched on when the temperature (pressure) is higher than SF1+HF1 and switched off when
it comes back to SF1, as explained in the following picture
F1
F2
Sf2
Sf2+HF2
ZIC
Sf1 + Hf1
Sf1
3.3 FAN CYCLING (ONLY FOR XC30CX)
To share the running hours between the 2 fans, the XC30CX will record the operating hours of each
fan. The controller will rotate the fan activation and de-activation to share the operating hours between
the 2 fans.
Note: with only one fan, it will be activated with T>SF1+HF1 and switched off with T<SF1.
4. FRONT PANEL COMMANDS
To display target set point; in programming mode it selects a parameter or confirm
an operation.
(RESTART) It depends on the rSC parameter; with rSC=rSt it allows a manual
restart and a “dead band reset”; with rSC=nP only the dead band reset is allowed.
(UP) To see the condenser temperature for 5 sec; in programming mode it browses
the parameter codes or increases the displayed value.
(DOWN) To see the dLt temperature; in programming mode it browses the
parameter codes or decreases the displayed value.
(SERVICE) To enter the service menu.
(Alarm menu) To enter the Alarm menu.
KEY COMBINATIONS:
+
To lock & unlock the keyboard.
+
To enter in programming mode.
+
To return to the suction pressure display.
4.1 USE OF LEDS
Each LED function is described in the following table.
LED MODE FUNCTION
ON Compressor enabled
Flashing Anti-short cycle delay enabled
1
ON Fan1 enabled (only for XC30CX)
2
ON Fans enabled (only for XC30CX)
kPA
ON kPA display
Flashing Programming mode
bar
ON bar display
Flashing Programming mode
PSI
ON PSI display
Flashing Programming mode
ON You’re browsing the service menu
Flashing A new alarm happened
ON You’re browsing the alarm menu
ON An alarm is occurring
5. OTHER FUNCTIONS
5.1 PRESSURE PROBE ERROR BY-PASS AT START UP
If a pressure probe error occurs at start-up, it will be by-passed for the P1d time, and the compressor
will be switched on when the following conditions are satisfied:
- odS, regulation delay at start up, is expired.
- With di1=Y, the thermostat digital input 14-17 is enabled.
- The HP digital input or the dLt temperature is not locking the regulation.
In this period the controller displays the flashing label P1E.
If during the P1d time the pressure probe error recovers, the standard regulation will start, otherwise,
when P1d expires the pressure probe error P1 will be signaled and the compressor will be switched on
and off cyclically with Con and CoF period.
5.2 PRESSURE PROBE ERROR BY-PASS WHEN THE COMPRESSOR IS NOT
WORKING
When the compressor is switched off the pressure probe error is not signalled. In this case if the
pressure raises and exceeds the pressure probe range, the controller will display the last value
flashing.
In this situation the compressor will restart when:
a. With di1=Y: the thermostat digital input (14-17) is enabled.
b. With di1=n: as soon as the delays for the compressor restart are expired.
c. If the compressor was switched off because of HP safety digital input or because of a
too high dLt temperature, it will be able to restart as soon as these conditions are
removed.
5.3 RESET DEAD BAND
If the pressure value is in the range [Cou to Cin] and the compressor relay is off, it’s possible to force
it keeping the RESTART key pressed for 2 sec. The compressor will run till the Cou threshold is
reached.
1592001520 XC10CX - XC30CX GB rel1.0 08.08.2012 XC30XC 2/4
5.4 EXTERNAL THEMOSTAT (14-17)
Function: the thermostat input, if present, enables the regulation only when active.
Contacts: 14-17 free voltage.
Parameters:
di1
Thermostat digital input presence (14-17)
n = the regulation is performed independently from the status of digital input 14-17.
Y = the regulation is performed only when the digital input 14-17 is enabled.
i1P
Thermostat digital input polarity 14-17
oP = the digital input is activated by opening the contacts 14-17.
CL = the digital input is activated by closing the contacts 14-17.
5.5 HP SAFETY PRESSURE SWITCH (15-17)
Function: the HP safety input, if present, switches off the compressor when active.
Contacts: 15-17 free voltage
Parameters:
di2
HP safety digital input presence 15-17
n = the regulation is performed independently from the status of digital input 15-17.
Y = the regulation is performed only when the digital input 15-17 is disabled.
i1P
HP safety digital input polarity 15-17
oP = the digital input is activated by opening the contacts 15-17.
CL = the digital input is activated by closing the contacts 15-17.
HPn
HP safety digital input activation before compressor lock
0 = always automatic restart
1 to 15 = when the number of activation of the digital input in an hour reaches HPn times,
the regulation is locked and a manual restart is required.
HPF
Minimum time of compressor off when the HP digital input is activated (0 to 15 min).
5.5.1 Functioning
NOTE: the HP safety digital input is checked only when the compressor is running
If the HP safety digital input is activated, the following actions will be performed
a. The compressor will be shut down.
b. The display will show the “HP” message alternated with suction probe
c. The HP alarm counter will be increased.
5.5.2 Automatic restart
If the HP digital input is switched off, the compressor will be able to restart only when the HPF and AC
timers are expired.
If the HP digital input is activated HPn times in an hour, a manual restart will be required. In this
situation:
a. The compressor will be shut down.
b. The display will show the “HPL” message alternated with suction probe.
c. The HP alarm counter will be increased.
5.5.3 Manual restart
a. Switch the controller off and on - or -
b. With rSC=rSt, keep the RESTART key pressed more than 5 sec - or -
c. Enter programming mode and set rSt=Y.
5.6 BUMP START FUNCTION
Purpose: the bump start function is useful to get the refrigerant out of the compressor, without losing
all of the oil, in the event of a flooded start and when pump-down and crank-case heaters are not
applicable or inadequate.
Parameters:
bMP
Bump start enabling
n = bump start disabled.
Y = bump start enabled.
on
Compressor on time: 1 to 15 sec.
oFF
Compressor off time: 1 to 15 sec.
nub
Number of cycle during bump start: 1 to 15.
bEn
Compressor stop time for next bump start: 1.0 to 23h50min, res. 10 min.
5.6.1 Functioning
At power on, after a power down or when the compressor remains off for the bEn time, it is activated
for on seconds and switched off for oFF seconds nub times.
5.7 COMPRESSOR SHUT DOWN WITH HIGH DLT TEMPERATURE ALARM
Purpose: with P3C=dLt, it’s possible to connect a PTC 990ohm probe to the 16-17 terminals for
monitoring the discharge line temperature. When the temperature reaches the set threshold, the
compressor will be shut down.
Parameters
doF
DLT alarm temperature to stop compressor: don to 200°C; don to 392°F.
don
DLT temperature for compressor restart: -30.0°C to doF; -22°F to doF.
ALd
Stop compressor delay: 0 to 255 sec.
nPS
Number of activation of DLT alarm in a hour to lock compressor
0 = always automatic restart.
1 to 15 = when the DLT alarm happens nPS times in an hour, the regulation is locked and
a manual restart is required.
dLF
Minimum time of compressor off with dLt temperature alarm: 0 to 15 min.
5.7.1 Functioning
When the temperature detected by the DLT probe is higher than doF value, the following actions will
be performed:
a. The compressor will be shut down.
b. The display will show the “dLt” message alternated with suction probe.
c. The dLt alarm counter will be increased.
5.7.2 Automatic restart
When the temperature detected by the dLT probe is lower than the don value, the compressor will be
able to restart only when both dLF and AC timers will expire.
If the temperature detected by the dLT probe reaches the doF value nPS times in an hour, a manual
restart will be required.
In this situation:
a. The compressor will be shut down.
b. The display will show the “dLL” message alternated with suction probe.
c. The dLL alarm counter will be increased.
5.7.3 Manual restart
a. Switch controller off and on - or b. With rSC=rSt, keep the RESTART key pressed more than 5 sec - or c. Enter programming mode and set rSt=Y.
NOTE: In any case the compressor can restart only if the dLt temperature is less than don
value.
6. MAIN INTERFACE
6.1 HOW TO SEE THE SETPOINT
1. Push and immediately release the SET key: the display will show the Cin
message.
2. Push the SET key to see the value.
3. Push and immediately release the SET key: the display will show the
Cou message.
4. Push the SET key to see the value.
6.2 HOW TO MODIFY THE SETPOINT
1. Keep push the SET key since the display will show the Cin message.
2. Push the SET key to see the value.
3. Use UP or DOWN to change its value
4. Push and immediately release the SET key: the display will show the
Cou message.
5. Push the SET key to see the value.
6. Use UP or DOWN to change its value
6.3 HOW TO CHANGE A PARAMETER VALUE
To change a parameter value, operate as follows:
1. Enter the Programming mode by keeping SET+DOWN keys pressed 3 sec (the “PSI” or “bar”
LED
starts blinking).
2. Select the required parameter. Press SET key to display its actual value.
3. Use UP or DOWN to change its value.
4. Press SET to store the new value and move to the following parameter.
To exit: Press SET+UP or wait for 15 sec without pressing a key.
NOTE: the set value is stored even when the procedure is exited by waiting the time-out to expire.
6.4 THE HIDDEN MENU
The hidden menu includes all the parameters of the instrument.
6.4.1 HOW TO ENTER THE HIDDEN MENU
1. Enter the Programming mode by pressing the SET+DOWN buttons for 3 sec (the °C or °F
LED will
start blinking).
2. Released the buttons and then push again the SET+DOWN buttons for more than 7 sec. The Pr2
label will be displayed immediately followed from the HY parameter.
Now it is possible to browse the hidden menu.
3. Select the required parameter.
4. Press the SET button to display its value.
5. Use UP or DOWN to change its value.
6. Press SET to store the new value and move to the following parameter.
To exit: Press SET+DOWN or wait 15 sec without pressing a key.
NOTE1: if no parameter is present in Pr1 menu, after 3 sec the “noP” message will be displayed.
Keep the buttons pushed till the Pr2 message will be displayed.
NOTE2: the set value is stored even when the procedure is exited by waiting for the time-out to expire
6.4.2 HOW TO MOVE A PARAMETER FROM THE HIDDEN MENU TO THE
FIRST LEVEL AND VICEVERSA
Each parameter present in the hidden menu (Pr2) can be moved into the user level (Pr1) by pressing
SET+DOWN buttons. If a parameter is part of the user level, when showed in the hidden menu the
decimal point will be lit.
6.5 HOW TO LOCK THE KEYBOARD
1.
Keep both UP and DOWN buttons pressed for more than 3 sec.
2.
The “PoF” message will be displayed and the keyboard will be locked. At this point it will be
possible only to see the set point or the MAX o Min temperature stored
3.
If a button is pressed more than 3 sec the “PoF” message will be displayed.
6.6 TO UNLOCK THE KEYBOARD
Keep pressed together for more than 3 sec the UP and DOWN keys till the “Pon” message will be
displayed.
7. ALARM MENU
The controller records in the Alarm menu the total number of activation of the following alarms.
- HP safety pressure switch activation ( up to 999) - HP menu
- High dLt temperature alarm ( up to 999) - dLt menu
- Total number of manual restarts (HPL and dLL) up to 255 - LOC menu.
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