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i1F=EAL or i1F=bAL: it is the delay between the detection of the external alarm
condition and its signalling.
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i1F=dor: it is the door open signalling delay.
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i1F=PAL: it is the time for pressure switch function: time interval to calculate the number
of the pressure switch activation.
nPS Pressure switch number: (0 to 15) it is the number of activation of the pressure switch, during
the did interval, before signalling the alarm event (i2F=PAL).
If the "nPS" activations in the "did" time are reached, switch off and on the instrument to
restart normal regulation.
odC Compressor status when open door: no=nothing; FAn=only fan off; CPr=only compressor
off; F_C=both compressor and fan OFF.
rrd Outputs restart after doA alarm: no=outputs not affected by the doA alarm; YES=outputs
restart with the doA alarm;
HES Temperature increase during the Energy Saving cycle: (-30.0 to 30.0°C; -54 to 54°F) it sets
the increasing value of the set point during the Energy Saving cycle.
OTHER
Adr Serial address: (1 to 247) it identifies the instrument address when connected to a ModBUS
compatible monitoring system.
PbC Type of probe: it allows to set the kind of probe used by the instrument: PtC=PTC probe;
ntC=NTC probe.
onF on/off key enabling: nu=disabled; oFF=enabled; ES=do not set it.
dP1 Thermostat probe display
dP2 Evaporator probe display
dP3 Third probe display
dP4 Fourth probe display.
rSE Real set point: (read only), it shows the set point used during the energy saving cycle or
during the continuous cycle.
rEL Software release: read only.
Ptb Parameter table code: read only.
1. DIGITAL INPUT (ENABLED WITH P3P = N)
The free voltage digital input is programmable in different configurations by the i1F parameter.
1.1 DOOR SWITCH INPUT (I1F = DOR)
It signals the door status and the corresponding relay output status through the odC parameter.
Since the door is opened, after the delay time set through parameter did, the door alarm is enabled,
the display shows the message "dA" and the regulation restarts is rtr=Y. 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.
1.2 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 status doesn't change. The alarm stops just after the digital input is de-
activated.
1.3 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.
1.4 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" activations in the "did" time are reached, switch off and on the instrument to
restart normal regulation.
1.5 START DEFROST (I1F = DFR)
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 for the MdF safety
time is expired.
1.6 INVERSION OF THE KIND OF ACTION: HEATING-COOLING (I1F = HTR)
This function allows inverting the regulation of the controller: from cooling to heating and vice versa.
1.7 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.
1.8 DIGITAL INPUTS POLARITY
The digital input polarity depends on the i1P parameter.
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i1P=CL: the input is activated by closing the contact.
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i1P=OP: the input is activated by opening the contact
2. TTL SERIAL LINE – FOR MONITORING SYSTEMS
The TTL serial line, available through the HOT KEY connector, allows by means of the external
TTL/RS485 converter, XJ485-CX, to connect the instrument to a monitoring system ModBUS-RTU
compatible, such as the X-WEB500/3000/300 family.
3. X-REP OUTPUT – OPTIONAL
As optional, an X-REP can be connected to the instrument, trough the HOY KEY connector. The X-
REP output EXCLUDES the serial connection.
manuale RNC 2018 277
To connect the X-REP to the instrument
the following connectors must be used
CAB-51F(1m),
CAB-52F(2m),
CAB-
55F(5m)
4. INSTALLATION AND MOUNTING
5. ELECTRICAL CONNECTIONS
The instrument is provided with screw terminal block to connect cables with a cross section up to
2.5mm
2
. Before connecting cables make sure the power supply complies with the instrument's
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.
5.1 PROBE CONNECTION
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.
6. HOW TO USE THE HOT KEY
6.1 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 UP key; the "uPL" message appears
followed a by flashing "End".
3.
Push the SET key and the "End" will stop flashing.
4.
Turn OFF the instrument and remove the Hot key, then turn the instrument ON again.
NOTE: the "Err" message is displayed for failed programming. In this case push again the UP key if
you want to restart the upload again or remove the Hot key to abort the operation.
6.2 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.
7. ALARM SIGNALS
Message
Cause
P1
Room probe failure
P2
Evaporator probe failure
"P3"
Third probe failure
P4
Fourth probe failure
HA
Maximum temperature alarm
LA
Minimum temperature alarm
HA2
Condenser high temperature
LA2
Condenser low temperature
dA
Door open
EA
External alarm
CA
Serious external alarm (i1F=bAL) All outputs OFF.
CA
Pressure switch alarm (i1F=PAL) All outputs OFF
7.1 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.
Temperature alarms HA, LA, HA2 and LA2 automatically stop as soon as the temperature returns to
normal values.
Alarms EA and CA (with i1F=bAL) recover as soon as the digital input is disabled.
Alarm CA (with i1F=PAL) recovers only by switching off and on the instrument.
7.2 OTHER MESSAGES
Pon
Keyboard unlocked.
PoF
Keyboard locked
noP
In programming mode: none parameter is present in Pr1
On the display or in dP2, dP3, dP4: the selected probe is nor enabled
noA
None alarm is recorded.
8. TECHNICAL DATA
Housing: self-extinguishing ABS
Case: XR50CH frontal 38x80 mm; depth 62mm
Mounting: XR50CH panel mounting in a 71x29mm panel cut-out
Rear protection: IP20;
Frontal protection: XR50CH IP65
Connections: Screw terminal block 2.5 mm
Power supply: according to the model:
12Vac/dc, ±10%;
24Vac/dc, ±10%;
9-40Vac/dc, ±10%;
230Vac 10%, 50/60Hz;
110Vac 10%, 50/60Hz
XR50CH
Instrument XR50CH 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.
Outputs
Compressor output acc. to par. Con and CoF
Defrost end is timed
Outputs unchanged
Outputs unchanged
Outputs unchanged.
Outputs unchanged.
It depends on the AC2 parameter
It depends on the bLL parameter
Compressor according to rrd
Output unchanged.
2
wiring
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