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dAo
Exclusion of temperature alarm at start-up: (0.0 to 24h00min, res. 10min) time
interval between the detection of the temperature alarm condition after instrument power
on and alarm signalling.
OUTPUT RELAYS
oA1
First relay configuration AUX1: (dEF; FAn; ALr; LiG; AUS; onF; db; CP2; dEF2) dEF =
defrost; FAn = do not select it; ALr = alarm; LiG = light; AUS = Auxiliary relay; onF =
always on when instrument on; CP2 = second compressor; dEF2 = second defrost.
oA2
Second relay configuration AUX2: (dEF; FAn; ALr; LiG; AUS; onF; db; CP2; dEF2)
dEF = defrost; FAn = do not select it; ALr = alarm; LiG = light; AUS = Auxiliary relay;
onF = always on when instrument on; CP2 = second compressor; dEF2 = second
defrost.
oA3
Third relay configuration AUX3: (dEF; FAn; ALr; LiG; AUS; onF; db; CP2; dEF2) dEF
= defrost; FAn = do not select it; ALr = alarm; LiG = light; AUS = Auxiliary relay; onF =
always on when instrument on; CP2 = second compressor; dEF2 = second defrost.
DIGITAL INPUTS
i1P
Second digital input polarity: (oP; CL) oP = the digital input is activated by opening the
contact; CL = the digital input is activated by closing the contact.
i1F
Second digital input configuration: (EAL; bAL; PAL; dor; dEF; AUS; Htr; FAn; ES)
EAL = external alarm: "EA" message is displayed; bAL = serious alarm "CA" message is
displayed; PAL = pressure switch alarm, "CA" message is displayed; dor = door switch
function; dEF = activation of a defrost cycle; AUS = auxiliary relay activation with
oAx=AUS; Htr = type of inverting action (cooling or heating); FAn = fan; ES = energy
saving.
did
Digital input 1 alarm delay: (0 to 255 min) delay between the detection of the external
alarm condition and its signalling.
When i1F= PAL, it is the interval of time to calculate the number of pressure switch
activation.
nPS
Number of pressure switch activation: (0 to 15) Number of activation, during the did
or d2d interval, before signalling an alarm event (i1F, i2F=PAL).
If the nPS activation during did or d2d time is reached, switch off and on the instrument
to restart normal regulation.
odC
Compressor status when open door: (no; FAn; CPr;F_C;) no = normal;
FAn = normal; CPr = compressor OFF, F_C = compressor OFF.
rrd
Outputs restart after door open alarm: (n; Y) n = outputs follow the odC parameter.
Y = outputs restart with a door open alarm.
HES
Delta temperature during an Energy Saving cycle: (-30.0 to 30.0°C; -54 to 54°F) it
sets the increasing value of the set point [SET+HES] during the Energy Saving cycle.
OTHER
HES
Temperature increase during the Energy Saving cycle : (-30,0°C
it sets the increasing value of the set point during the Energy Saving cycle
o-F
Display during stand by: OFF = "OFF"; Lin: "- - -"
Adr
Serial address: (1 to 247) identifies the instrument address when connected to a
ModBUS compatible monitoring system.
PbC
Type of probe: (PtC; ntC) it allows to set the kind of probe used by the instrument:
PtC = PTC probe, ntC = NTC probe.
onF
On/Off key enabling: (nU; oFF; ES) nU = disabled; oFF = enabled; ES = not set it.
dP1
Thermostat probe display.
dP2
Evaporator probe display.
dP3
Third probe display- optional.
dP4
Fourth probe display- optional.
rEL
Software release for internal use.
Ptb
Parameter table code: readable only.
9. DIGITAL INPUTS
The free voltage digital input is programmable by the i1F parameter.
9.1 GENERIC ALARM (I1F = EAL)
As soon as the digital input is activated the unit will wait for did time delay before signalling the EAL
alarm message. The outputs statuses don't change. The alarm stops just after the digital input is de-
activated.
9.2 SERIOUS ALARM MODE (I1F = BAL)
When the digital input is activated, the unit will wait for did delay before signalling the CA alarm
message. The relay outputs are switched OFF. The alarm will stop as soon as the digital input is de-
activated.
9.3 PRESSURE SWITCH (I1F = PAL)
If during the interval time set by did parameter, the pressure switch has reached the number of
activation of the nPS parameter; the CA pressure alarm message will be displayed. The compressor
and the regulation are stopped. When the digital input is ON the compressor is always OFF. If the
nPS activation in the did time is reached, switch off and on the instrument to restart normal
regulation.
9.4 DOOR SWITCH INPUT (I1F = DOR)
It signals the door status and the corresponding relay output status through the odC parameter:
no = normal (any change); FAn = Fan OFF; CPr = Compressor OFF; F_C = Compressor and fan
OFF. Since the door is opened, after the delay time set through parameter doA, the door alarm is
enabled, the display shows the message dA and the regulation restarts is rtr=YES. The alarm stops
as soon as the external digital input is disabled again. With the door open, the high and low
temperature alarms are disabled.
9.5 START DEFROST (I1F = DEF)
It starts a defrost if there are the right conditions. After the defrost is finished, the normal regulation will
restart only if the digital input is disabled otherwise the instrument will wait until the "MdF" safety time
is expired.
xxxxxxxxxxxxxxxxxx XR44CH ISA GB r1.6 21.11.2016
9.6 SWITCH THE AUXILIARY RELAY (I1F = AUS)
With oA3 = AUS the digital input switched the status of the auxiliary relay
9.7 ENERGY SAVING (I1F = ES)
The Energy Saving function allows to change the set point value as the result of the SET+ HES
(parameter) sum. This function is enabled until the digital input is activated.
9.8 ON OFF FUNCTION (I1F = ONF)
To switch the controller on and off.
9.9 DIGITAL INPUT POLARITY
The digital input polarity depends on the i1P parameter.
i1P = CL: the input is activated by closing the contact.
i1P = oP: the input is activated by opening the contact
10. TTL SERIAL LINE – FOR MONITORING SYSTEMS
The TTL serial line, available through the HOT KEY connector, allows to connect the instrument to a
monitoring system ModBUS-RTU compatible such as the XWEB500. The connection needs a special
TTL/RS485 adapter: the XJ485CX.
11. INSTALLATION AND MOUNTING
12. ELECTRICAL CONNECTIONS
The instrument is provided with screw terminal block to connect cables with a cross section up to
2.5mm
requirements. Separate the probe 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.
12.1 PROBE CONNECTION
30,0°C/-22÷86°F)
The probes shall be mounted with the bulb upwards to prevent damages due to casual liquid
infiltration. It is recommended to place the thermostat probe away from air streams to correctly
measure the average room temperature. Place the defrost termination probe among the evaporator
fins in the coldest place, where most ice is formed, far from heaters or from the warmest place during
defrost, to prevent premature defrost termination.
13. USE THE HOT KEY
13.1 HOW TO: PROGRAM A HOT KEY FROM THE INSTRUMENT (UPLOAD)
1.
2.
3.
4.
NOTE: the "Err" message appears in case of a failed programming operation. In this case push again
button if you want to restart the upload again or remove the "HOT-KEY" to abort the operation.
13.2 HOW TO: PROGRAM AN INSTRUMENT USING A HOT KEY (DOWNLOAD)
1.
2.
3.
4.
5.
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.
14. ALARM SIGNALS
Message
P1
P2
P3
P4
HA
LA
dA
EA
CA
CA
oFF
- - -
14.1 ALARM RECOVERY
Probe alarms "P1", "P2", "P3" and "P4" start some seconds after the fault in the related probe; they
automatically stop some seconds after the probe restarts normal operation. Check connections before
replacing the probe.
XR44CH
Instrument XR44CX shall be mounted on vertical panel, in a 29x71
mm hole, and fixed using the special bracket supplied.
The temperature range allowed for correct operation is 0 to 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.
. Before connecting cables make sure the power supply complies with the instrument's
2
Program one controller with the front keypad.
When the controller is ON, insert the "HOT-KEY" and push UP button; the "uPL" message
appears followed a by a flashing "End" label.
Push SET button and the "End" will stop flashing.
Turn OFF the instrument, remove the "HOT-KEY" and then turn it ON again.
Turn OFF the instrument.
Insert a pre-programmed "HOT-KEY" into the 5-PIN receptacle and then turn the Controller
ON.
The parameter list of the "HOT-KEY" will be automatically downloaded into the Controller
memory. The "doL" message will blink followed a by a flashing "End" label.
After 10 seconds the instrument will restart working with the new parameters.
Remove the "HOT-KEY".
Cause
Room probe failure
Compressor output acc. to par. Con and CoF
Evaporator probe failure
Defrost end is timed
Third probe failure
Outputs unchanged
Fourth probe failure
Outputs unchanged
Maximum temperature alarm
Outputs unchanged.
Minimum temperature alarm
Outputs unchanged.
Door open
Compressor and fans restarts
External alarm
Output unchanged.
Serious external alarm (i2F=bAL) All outputs OFF.
Pressure switch alarm (i2F=PAL) All outputs OFF
Controller in stand by
All outputs OFF
Controller in stand by
All outputs OFF
Outputs
4/5
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