Advertisement
8.8 HOLIDAY DEFROST (i1F or i2F = HDF) –ONLY FOR MODELS WITH RTC
This function enabled the holiday defrost setting.
8.9 ON OFF FUNCTION (i1F or i2F = onF)
To switch the controller on and off.
8.10 DIGITAL INPUTS POLARITY
The digital input polarity depends on the "i1P" and "i2P" parameters.
i1P or i2P =CL: the input is activated by closing the contact.
i1P or i2P=OP: the input is activated by opening the contact
9. 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.
10. 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.
11. INSTALLATION AND MOUNTING
The controller shall be mounted on vertical panel, in a 150x31 mm hole, and fixed using two screws
3 x 2mm (only for XW20LR).
XW20LR: to obtain an IP65 protection grade use the front panel rubber gasket (mod. RG-L). 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 the air circulate by the cooling holes.
11.1 CUT OUT
XW20LRH: the holes are not required
11.2 STEEL FINISHING MOUNTING
1
2
4
3
12. ELECTRICAL CONNECTIONS
The instruments are provided with screw terminal block to connect cables with a cross section up to
2,5 mm
2
for the digital and analogue inputs. Relays and power supply have a Faston connection
(6,3mm). Heat-resistant cables have to be used. 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.
N.B. Maximum current allowed for all the loads is 20A.
12.1 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.
1592027520 XW20LR XW20LRH RTC GB r2.0 14.02.2014.docx
To connect the X-REP to the instrument the
following connectors must be used CAB-
51F(1m), CAB-52F(2m), CAB-55F(5m),
1
3
2
RG-LX gascke
(optional)
4
13. HOW TO USE THE HOT KEY
13.1 HOW TO PROGRAM A HOT KEY FROM THE INSTRUMENT (UPLOAD)
1.
Program one controller with the front keypad.
When the controller is ON, insert the "Hot key" and push o key; the "uPL" message
2.
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.
13.2 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.
14. ALARM SIGNALS
Message
"P1"
Room probe failure
"P2"
Second probe failure
"P3"
Third 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
"rtc"
Real time clock alarm
rtF
Real time clock board failure
14.1 ALARM RECOVERY
Probe alarms P1", "P2" 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.
Real time clock alarm rtC, it stops as soon as the correct hour and day are set.
Real time clock alarm rtF, the clock board has to be replaced. Contact the service.
14.2 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
15. TECHNICAL DATA
Housing: self extinguishing ABS.
Case: facia 38x185 mm; depth 40mm
Mounting : panel mounting in a 150x31 mm panel cut-out.
Only for XW20LR two screws.
Protection: IP20; Frontal protection: IP65 with frontal gasket mod RG-L or RG-LX.
Connections: Screw terminal block
Power supply: 230Vac or. 110Vac 10%, 50/60Hz.
Power absorption: 7VA max.
Display: 3 digits, red LED, 14,2 mm high.
Inputs: Up to 3 NTC or PTC probes.
Digital inputs: free voltage
Relay outputs: Total current on loads MAX. 20A
compressor: relay SPST 20(8) A, 250Vac
light: relay SPST 8A, 250Vac
Other output : buzzer (optional)
Serial output : TTL standard; Communication protocol: Modbus - RTU
Data storing: on the non-volatile memory (EEPROM).
Internal clock back-up: 24 hours (only for model with RTC)
Kind of action: 1B; Pollution grade: normal; Software class: A.;
Over voltage Category: II
Operating temperature: 0÷60 °C; Storage temperature: -30÷85 °C.
Relative humidity: 2085% (no condensing)
Measuring and regulation range: NTC probe: -40÷110°C (-40÷230°F);
PTC probe: -50÷150°C (-58÷302°F)
Resolution: 0,1 °C or 1 °F (selectable); Accuracy (ambient temp. 25°C): ±0,7 °C ±1 digit
XW20LR – XW20LRH
Cause
Compressor output acc. to par. "Con" and "COF"
Defrost end is timed
Outputs unchanged
Outputs unchanged.
Outputs unchanged.
It depends on the "Ac2" parameter
It depends on the "bLL" parameter
Loads according to the "odC" parameter
Output unchanged.
Alarm output ON; Other outputs unchanged;
Defrosts according to par. "IdF" Set real time clock
has to be set
Alarm output ON; Other outputs unchanged;
Defrosts according to par. "IdF" Contact the
service
3 x 2mm, distance between the holes 165mm
2,5 mm
2
heat-resistant wiring and 6,3mm Faston
Outputs
4/5
Advertisement
