dIXEL
Installing and Operating Instructions
1592026000
1592026000 XW20K GB R1.0 22.02.2008.doc
XW20K
3/5
SHy Differential for auxiliary relay:
(0,1÷25,5°C; 1÷45°F): Intervention differential for auxiliary relay
set point, always positive.
ArP Probe selection for auxiliary
:
nP
= aux relay is switched by digital input with i1F = AUS;
P1 =
Probe 1 (Thermostat probe);
P2 =
not set it;
P3 =
Probe 3 (display probe).;
P4 =
Probe 4
Sdd Auxiliary output working during defrost:
n =
the auxiliary output is switched off during defrost
y =
the auxiliary output goes on working during defrost
ALARMS
ALP Probe for temperature alarm setting: P1 =
thermostat probe; P2 = evaporator probe; P3 =
condenser 1 probe; P4 O condenser 2 probe.
ALC Temperature alarm configuration
rE
= High and Low alarms related to Set Point
Ab
= High and low alarms related to the absolute temperature.
ALU High temperature alarm setting:
ALC= rE, 0
÷
50°C or 90°F
ALC= Ab, ALL
÷
110°C or 230°F
when this temperature is reached and after the ALd delay time the HA alarm is enabled.
ALL Low temperature alarm setting:
ALC = rE , 0
÷
50 °C or 90°F;
ALC = Ab , - 50°C
or -58°F
÷
ALU when this temperature is reached and after the ALd delay time, the LA alarm is
enabled.
AFH Temperature alarm and fan differential:
(0,1÷25,5°C; 1÷45°F) Intervention differential for
temperature alarm set point and fan regulation set point, always positive.
ALd Temperature alarm delay:
(0÷255 min) time interval between the detection of an alarm
condition and the corresponding alarm signalling.
dAo Delay of temperature alarm at start-up:
(0min÷23h 50min) time interval between the detection
of the temperature alarm condition after the instrument power on and the alarm signalling.
CONDENSER TEMPERATURE ALARM
AP2 Probe selection for temperature alarm of condenser: nP
= no probe;
P1
=thermostat probe;
P2 =
evaporator probe;
P3
=third probe;
P4
= fourth probe.
AL2 Low temperature alarm of condenser
:
(-55÷150°C) when this temperature is reached the LA2
alarm is signalled, possibly after the Ad2 delay.
Au2 High temperature alarm of condenser
:
(-55÷150°C) when this temperature is reached the HA2
alarm is signalled, possibly after the Ad2 delay.
AH2 Differential for temperature condenser alarm recovery
:
(0,1÷25,5°C; 1÷45°F)
Ad2 Condenser temperature alarm delay
: (0÷255 min) time interval between the detection of the
condenser alarm condition and alarm signalling.
dA2 Condenser temperature alarm exclusion at start up
: (from 0.0 min to 23.5h, res. 10min)
bLL Compressor off with low temperature alarm of condenser
:
n = no:
compressor keeps on
working
; Y = yes,
compressor is switched off till the alarm is present, in any case regulation
restarts after AC time at minimum.
AC2 Compressor off with high temperature alarm of condenser
:
n = no:
compressor keeps on
working
; Y = yes,
compressor is switched off till the alarm is present, in any case regulation
restarts after AC time at minimum.
RELAY OA3 (22-23) CONFIGURATION
tbA Alarm relay silencing (with oA3=ALr):
n
= silencing disabled: alarm relay stays on till alarm condition lasts,
y
=silencing enabled: alarm relay is switched OFF by pressing a key during an alarm
oA3 Fourth relay configuration (22-23):
dEF:
do not select it!.
; FAn:
do not select it!.
; ALr
: alarm;
Lig
: light;
AuS
: Auxiliary relay;
onF
: always on with instrument on;
db =
heating element for
neutral zone regulation;
cP2 =
second compressor,
dF2:
do not select it.
AoP Alarm relay polarity:
it set if the alarm relay is open or closed when an alarm happens.
CL
=
terminals 1-2 closed during an alarm;
oP
= terminals 1-2 open during an alarm
DIGITAL INPUT
i1P Digital input polarity: oP:
the digital input is activated by opening the contact;
CL:
the digital
input is activated by closing the contact.
i1F Digital input configuration: 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
=to switch on and off the 22-23
relay with oA3 = AUS;
Htr
= kind of action inversion (cooling – heating);
FAn = not set it; ES =
Energy saving.
did
:
(0
÷
255 min)
with
i1F= EAL or i1F = bAL digital input alarm delay:
delay between the detection
of the external alarm condition and its signalling.
with
i1F= dor: door open signalling delay
with i1F = PAL: time for pressure switch function:
time interval to calculate the number of the
pressure switch activation.
nPS Pressure switch number:
(0
÷
15) Number of activation of the pressure switch, during the “
did
”
interval, before signalling the alarm event (I2F= PAL).
If the nPS activation in the did time is reached, switch off and on the instrument to restart
normal regulation.
odc Compressor status when open door:
no;
Fan
= normal;
CPr; F_C
= Compressor 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°C
÷
30,0°C/-22÷86°F) it sets
the increasing value of the set point during the Energy Saving cycle.
OTHER
Adr RS485 serial address
(1÷247)
:
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:
PbC
= PBC probe,
ntc =
NTC probe.
onF on/off key enabling: nu =
disabled;
oFF =
enabled;
ES =
to start a energy saving cycle.
dP3 Third probe display
-
optional
.
dP4 Fourth probe display
.
rSE Real set point:
it shows the set point used during the energy saving cycle or during the
continuous cycle.
rEL Release software:
(read only) Software version of the microprocessor.
Ptb Parameter table:
(read only) it shows the original code of the
dIXEL
parameter map.
7. Digital input
The free voltage digital input is programmable in different configurations by the “
i1F
” parameter.
DOOR SWITCH INPUT (i1F = dor)
It signals the door status and the corresponding relay output status through the “
odc
” parameter:
no,
Fan
= normal (any change);
CPr,
F_C
= Compressor OFF.
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 = 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.
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 don’t change. The alarm stops just after the digital input is de-
activated.
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.
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.
AUXILIARY OUTPUT SWITCHING (i1F =AUS)
With oA3 = AUS and i1F = AUX it switches the fourth relay (22-23).
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 until the “MdF” safety time
is expired.
INVERSION OF THE KIND OF ACTION: HEATING-COOLING (i1F = Htr)
This function allows to invert the regulation of the controller: from cooling to heating and viceversa.
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.
DIGITAL INPUTS 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
8. Installation and mounting
T620
keyboard shall be mounted on vertical panel, in a 150x31 mm hole, and fixed using two screws
∅
3 x 2mm. To obtain an IP65 protection grade use the front panel rubber gasket (mod. RG-L).
V620
keyboard shall be mounted on vertical panel, in a 72x56 mm hole, and fixed using two screws
∅
3 x 2mm. To obtain an IP65 protection grade use the front panel rubber gasket (mod. RGW-V).
CX620
keyboard shall be mounted on vertical panel, in a 29x71 mm hole, and fixed using the special
bracket supplied.
The controller
XW20K
shall be mounted in a din rail
It must be connected to the keyboard by means of a two-wire cable (
∅
1mm). 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.
XW20K – 8 DIN CASE - DIMENSIONS
9. Electrical connections
XW20K
is provided with screw terminal blocks to connect cables with a cross section up to 2,5 mm
2
for
the RS485(optional) and the keyboard. Connecting other inputs, power supply and relays,
XW20K
is
provided with Faston connections (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.
9.1
PROBE CONNECTIONS
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
