1592023140 XM678D GB r2.8 01.09.2017.docx XM678D 8/15
The modulating output [trA = rEG] works in proportional way (excluding the first AMt
seconds where the fans speed is the maximum.
The regulation set point is relative to regulation set point and is indicated by ASr, the
proportional band is always located above [SET + ASr] value and its value is PbA. The
fans are at minimum speed AMi when the temperature read by fan probe is [SET +
ASr] and the fan is at maximum speed (AMA) when the temperature is [SET + ASr +
PbA].
16.5 ANTI SWEAT HEATERS
The anti-sweat heater regulation can be performed with on board relay (if OA6 = AC)
or with the analog output (if present by setting trA = AC). However the regulation can
be performed in two ways:
Without real dew-point information: in this case the default value for dew-
point is used (SdP parameter).
Receiving dew-point from XWEB5000 system: the SdP parameter is
overwritten when valid value for dew-point is received from XWEB. In case
of XWEB link is lost, SdP is the value that will be used for safety.
The best performance can be obtained using probe 4. In this case, the regulation
follows the chart:
Probe 4 should be placed on the showcase glass. For each cabinet can be used
only one probe 4 (P4) sending its value to the others section that are connected to the
LAN.
HOW TO WORK WITH PROBE 4 THROUGH THE LAN:
Param.
Without probe 4
P4C
nP
AMt
% of ON
In this case, the regulation is performed by
switching on and off the auxiliary relay on a
60 minutes time base. The ON time will be
the AMt value, so that the relay will be ON
for AMt minutes and OFF for [60-AMt]
minutes.
In case of P4 error or if P4 is absent the output is at AMA value for the AMt time then
the output is at 0 value for the time [255 – AMt] time performing a simple PWM
modulation.
16.6 AUXILIARY OUTPUT
The auxiliary output is switch ON and OFF by means of the corresponding digital input
or by pressing and releasing the down arrow key.
17. TECHNICAL DATA
CX660 keyboard
Housing: self extinguishing ABS
Case: CX660 fascia 35x77 mm; depth 18mm
Mounting: panel mounting in a 29x71 mm panel cut-out
Protection: IP20
Frontal protection: IP65
Power supply: from XM600 power module
Display: 3 digits, red LED, 14.2 mm high
Optional output: buzzer
Power modules
Case: 8 DIN
Connections: Screw terminal block 1.6 mm
2
heat-resistant wiring and 5.0mm fast-
on or screw terminals.
Power supply: 24Vac
Power absorption: 20VA max.
Inputs: up to 6 NTC; PTC; Pt1000 probes. Max cable length 15m
Digital inputs: 3 free of voltage. Max cable length 15m
Relay outputs: Total current on loads MAX. 16A.
Solenoid Valve: relay SPST 5A, 250Vac
Defrost: relay SPST 16A, 250Vac
Fan: relay SPST 8A, 250Vac
Light: relay SPST 16A, 250Vac
Alarm: SPDT relay 8A, 250Vac
Aux: SPST relay 8A, 250Vac
Outputs for valve: bipolar or unipolar valves.
Max distance between controller and valve: up to 10m with shilded twisted cables,
AWG 18 (0.823mm
2
) or less.
Max length for LAN:: up to 30m with shilded twisted cables, AWG 20 (0.51mm
2
) or
less.
Optional output (AnOUT) DEPENDING ON THE MODELS:
PWM / Open Collector outputs: PWM or 12Vdc max 40mA
Analog output: 4 to 20mA or 0 to 10V
Serial output: RS485 with ModBUS - RTU and LAN
Data storing: on the non-volatile memory (EEPROM)
Kind of action: 1B; Pollution degree: 2
Software class: A
Operating temperature: -10 to 60°C (14 to 140°F)
Storage temperature: -25 to 60°C (-13 to 140°F)
Relative humidity: 20 to 85% (no condensing)
Measuring and regulation range:
NTC probe: -40 to 110°C (-58 to 230°F)
PTC probe: -50 to 150°C (-67 to 302°F)
Pt1000 probe: -100 to 100°C (-148 to 212°F)
Resolution: 0.1°C or 1°C or 1°F (selectable).
Accuracy (ambient temp. 25°C): ±0.5 °C ±1 digit.
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