Emerson Dixell XWi70K - User Manual

1592026601 XWi70K STD FULL EN r1.6 2022.07.29.docx XWi70K 1/15
XWi70K
ADVANCED ENERGY MANAGEMENT CONTROLLER
FW REL. 24.5
1 GENERAL WARNING.................................................................................................................. 1
2 GENERAL DESCRIPTION .......................................................................................................... 1
3 FIXED SPEED COMPRESSOR CONTROL ............................................................................... 1
4 DEFROST .................................................................................................................................... 1
5 FAN MANAGEMENT ................................................................................................................... 1
6 EVAPORATOR FAN CONTROL ................................................................................................. 2
7 CONDENSER FAN CONTROL ................................................................................................... 2
8 AUXILIARY REGULATORS ........................................................................................................ 2
9 ANALOGUE OUTPUTS ............................................................................................................... 2
10 VARIABLE SPEED DRIVE CONTROL ....................................................................................... 2
11 SPECIAL FUNCTIONS ................................................................................................................ 3
12 KEYBOARDS ............................................................................................................................... 3
13 CONTROLLER INTERFACE ....................................................................................................... 4
14 PROGRAMMING MODE ............................................................................................................. 4
15 PARAMETER LIST ...................................................................................................................... 4
16 DIGITAL INPUT............................................................................................................................ 7
17 HOW TO INSTALL AND MOUNT................................................................................................ 8
18 ELECTRICAL CONNECTIONS ................................................................................................... 8
19 TTL/RS485 SERIAL LINE ............................................................................................................ 8
20 HOW TO USE OF THE “HOT KEY” ............................................................................................ 8
21 INTERNAL MEMORY .................................................................................................................. 8
22 ALARM SIGNALS ........................................................................................................................ 8
23 WIRING DIAGRAMS .................................................................................................................... 9
24 DEFAULT PARAMETER MAPS .................................................................................................. 9
25 TECHNICAL DATA .................................................................................................................... 15
1 GENERAL WARNING
1.1 PLEASE READ BEFORE USING THIS MANUAL
• This manual is part of the product and should be kept near the instrument for easy and quick
reference.
• The instrument shall not be used for purposes different from those described hereunder. It cannot
be used as a safety device.
• Check the application limits before proceeding.
• Dixell S.r.l. reserves the right to change the composition of its products, even without notice,
ensuring the same and unchanged functionality.
1.2 SAFETY PRECAUTIONS
• Check the supply voltage is correct before connecting the instrument.
• Do not expose to water or moisture: use the controller only within the operating limits avoiding
sudden temperature changes with high atmospheric humidity to prevent formation of condensation
• Warning: disconnect all electrical connections before any kind of maintenance.
• Fit the probe where it is not accessible by the End User. The instrument must not be opened.
• In case of failure or faulty operation send the instrument back to the distributor or to “Dixell S.r.l.”
(see address) with a detailed description of the fault.
• Consider the maximum current which can be applied to each relay (see Technical Data).
• Ensure that the wires for probes, loads and the power supply are separated and far enough from
each other, without crossing or intertwining.
• In case of applications in industrial environments, the use of mains filters (our mod. FT1) in parallel
with inductive loads could be useful.
2 GENERAL DESCRIPTION
Model XWi70K is a microprocessor-based controller suitable for applications on medium or low
temperature refrigerating units. It must be connected by means of a two-wire shielded twisted cable (
1mm) at up to 30 meters to the keyboard CH620, T620T/H or T820T/H. It is provided with five relay
outputs to control compressor, defrost (which can be either electrical or hot gas), evaporator and
condenser fans and light or alarm. It is also provided with 4 NTC or PT1000 probe inputs. It has a both
a frequency output and a serial port which can be used to control variable speed compressors. A couple
of analogue outputs (4-20mA or 0-10Vdc) and a master 2-wire RS485 output for serial controlled
ventilator complete the HW resources.
The HOTKEY I/O port allows connecting the unit, by means of the external module XJ485-CX, to a
network line ModBUS-RTU compatible such as an X-WEB monitoring system. With the HOTKEY port
it is possible to modify the configuration of the controller (by using the Wizmate Progtool Kit).
The instrument is fully configurable and it can be easily programmed through an external keyboard.
3 FIXED SPEED COMPRESSOR CONTROL
The regulation uses the temperature measured by the regulation probe with a positive differential from
the set point: if the temperature increases and reaches set point plus differential the compressor is
started and then turned off when the temperature reaches the set point value again. In case of any
regulation probe fault, the compressor management will switch to fixed ON/OFF time mode, as set in
the parameters Con and CoF.
3.1 DOUBLE FIXED SPEED COMPRESSOR CONTROL
The controller can drive double compressor circuits. To do this, a couple of relays need to be properly
configured: oAx=CP1 and oAy=CP2. (do not use oA5 for compressor management). The parameters
used for this kind of regulation are the following:
AC
Compressor anti-short-cycle delay
AC1
Second compressor anti-short-cycle delay
2CC
Activation mode for second compressor (valid if oAx=CP1 and oAy=CP2)
rCC
Compressors rotation enabled
Cdd
Maximum time with compressor active
The second compressor output is activated by following the 2CC parameter:
- If 2CC=FUL then in parallel with the relay of the first compressor (CP1), with a possible
delay as set in the AC1 parameter. Both compressors are switched off at the same time.
- If 2CC=HAF then only if the temperature T>SET+HY+HY1. The delay AC1 is always
respected. The second compressor is deactivated when T<SET+HY.
With parameter rCC it is possible to enable the compressor rotation function: the activation of the first
and the second compressor will be alternated to equalize the number of working hours of both of them.
In case of hot gas defrost operation, it is possible to select if one or both compressors will be used.
3.2 PULL DOWN
When defrost is not in progress, it can be activated by keeping the UP button pressed for 3 sec. The
compressor will operate to reach the CCS set point by the time set through the CCt parameter. The
cycle can be terminated before the end of the CCt time by using the same activation button (keeping
the UP pressed for 3 sec when PULL DOWN is running)
4 DEFROST
Two defrost modes are available through the tdF parameter: defrost through electrical heater
(tdF=EL) and hot gas defrost (tdF=in).
The defrost interval depends on the presence of the RTC (optional). The internal RTC is controlled by
means of the EdF parameter:
- EdF=in: the defrost is made every idF time – standard way for controller without RTC.
- EdF=rtC: the defrost is real time controlled, depending on the day enabled in the parameters
dd1…dd7 and the hours set in the parameters Ld1...Ld6.
Other parameters are used to control defrosting cycles: the maximum length (MdF) and defrosting
modes: timed or controlled by the evaporator’s probe (P2P).
At the end of defrost dripping time is started, its length is set in the Fdt parameter. With Fdt=0 the
dripping time is disabled.
4.1 SYNCHRONIZED DEFROST
This defrost function requires:
- To set a digital input of any controller as ixF=dEF
- To connect (by wire) all digital inputs set as ixF=dEF
A maximum number of 20 controllers can be used in this configuration.
The Synchronized defrost mode is enabled by par. SYd=SYn. After any defrost request (received by
RTC, timed by par. idF, manually by defrost button or by digital input set as dEF), all controllers will
activate their own defrost phase. The first controller which ends its defrost phase will release the defrost
line and load its dripping time. At the end of the dripping time the normal regulation will restart.
The other controllers follow the same logic.
4.2 DESYNCRONIZED DEFROST
This defrost function requires:
- To set a digital input of any controller as ixF=dEF
- To connect (by wire) all digital inputs set as ixF=dEF
A maximum number of 20 controllers can be used in this configuration.
The De-Synchronized defrost mode is enabled by par. SYd=nSY. After any defrost request (received
by RTC, timed by par. idF, manually by defrost button or by digital input set as dEF), all controllers will
load a random delay. The first controller which ends the random delay will retain the ixF=dEF line to
signal to the other controllers that they have to wait before starting their own defrost phases. When the
first controller ends its defrost phase, it will release the ixF=dEF line. The other ones will repeat the
same procedure. The total defrost phase will end when all controllers complete their own defrost phases.
NOTES:
- take care about the time available to complete the defrost phase. It must be used for selecting
the proper MdF value
- all controllers in waiting mode will keep on the normal regulation
4.3 RANDOM DEFROST
A random defrost mode can be enabled by par. Syd=rnd. After any defrost request (received by RTC
or timed by par. idF) a random delay will be added. At the end of the added delay the defrost will start.
The random function lead to desynchronize the start of the defrost phases in those cases where more
than a cabinet is installed in the same “island”. The maximum defrost delay is linked to the following
parameters:
- Mdf=maximum time for any defrost
- ndE=delay multiplier
by the following formula:
MAX_DEFROST_DELAY = Mdf*ndE (min)
For example: if ndE=10 and Mdf=20 min, this means that the total interval of time used by any device
for complete its defrost phase is 200 min (worst case).
NOTE:
- take care about the interval of time available for defrost. It must be used for selecting both MdF
and ndE values
- the higher is the ndE value and the better is the result in terms of desynchronization. On the
other side, the longer will be the total interval of time required to complete defrosts
5 FAN MANAGEMENT
The controller can manage the following type of fans:
- Fixed speed fans (oAx=FAn, Cnd)
- Variable speed fans with 0-10V or 4-20mA control signal (1Ao or 2Ao=FAn, Cnd)
- Variable speed fans with Modbus control signal (EBM models only)
5.1 MODBUS FAN SUPPORTED
It is possible to use up to 4 fans with EBM Modbus communication protocol. The following parameters
need to be properly configured:
- S00: number of condenser fan controlled via Modbus
- C01 to C04: serial address for condenser fans
- vdF: serial output for fan management enabled

Summary

General Warning

Safety Precautions

Essential safety measures for instrument connection and maintenance.

General Description of XWi70 K Controller

XWi70 K Controller Overview

Microprocessor controller for refrigerating units with multiple I/O capabilities.

Fixed Speed Compressor Control

Double Fixed Speed Compressor Control

Configuration for dual compressor circuits using specific parameters.

Defrost Functions

Synchronized Defrost

Enables synchronized defrost operations across multiple controllers.

De-Synchronized Defrost

Enables de-synchronized defrost operations across multiple controllers.

Random Defrost

Randomizes defrost start times to avoid simultaneous operation of multiple units.

Fan Management

Modbus Fan Support

Configuration for using up to 4 fans with EBM Modbus communication protocol.

Evaporator Fan Control

Forced Activation for Evaporator Fans

Activates fans based on temperature difference to prevent short cycles.

Cyclic Activation of Fans When Compressor is Off

Manages on/off cycles for fans when the compressor is stopped.

Condenser Fan Control

Modbus Configuration for Fans

Parameters for configuring fans controlled via Modbus.

Auxiliary Regulators

Auxiliary Regulator Configuration

Parameters for configuring auxiliary regulators linked to digital or analogue outputs.

Analogue Outputs

Analogue Output Configuration

Parameters for configuring analogue output type, min, and max values.

Variable Speed Drive (VSD) Control

Frequency Mode for VSD

Controls variable speed drives using a frequency signal.

Serial Mode Control for VSD

Controls variable speed compressors using serial communication.

VSD Parameters

Parameters for regulating VSD compressor speed and operation.

Hot Gas Defrost and VSD

Setting compressor speed during hot gas defrost operation.

Pull Down Function with VSD

Forces controller operation at max speed for pull-down until setpoint is reached.

Oil Migration Control for VSD

Lubrication control to prevent oil migration during VSD compressor operation.

PI Algorithm for VSD Control

PI Algorithm Parameter Recommendations

Advises for setting PI algorithm parameters in various applications.

Special Functions

Light Relay Function

Configuration for using a relay as a light switch.

Second Compressor Management

Configuration for managing a second compressor.

On;Off Relay Function

Configuration for using a relay as a simple on/off switch.

Alarm Relay Function

Configuration for using a relay to signal alarms.

Anti-Sweat Heater Function

Configuration for using a relay as an anti-sweat heater.

Energy Saving Timeout

Sets a timeout for the energy saving function.

Dead Band Function

Manages regulation with a dead band for heating or cooling.

Keyboard Interface and Functions

Keyboard Lock Function

How to lock and unlock the keyboard for partial or complete access.

Keyboard Models and Key Combinations

Overview of different keyboard models and their key combinations.

LED Indicator Functions

Controller Interface Operations

Setting Current Time and Day

Procedure for programming the real-time clock.

Viewing Minimum Temperature

How to display the minimum recorded temperature.

Viewing Maximum Temperature

How to display the maximum recorded temperature.

Resetting Max and Min Temperatures

Procedure to reset stored maximum and minimum temperatures.

Viewing and Modifying Set Point

How to view and change the temperature set point.

Starting Manual Defrost

Procedure to initiate a manual defrost cycle.

ON;OFF Function (Standby)

How to put the controller into or out of standby mode.

Viewing Probe Values

How to view the values of connected probes.

Programming Mode Operations

Keyboard Lock Functionality

How to lock and unlock the keyboard using button combinations.

Accessing Parameter Menus (PR1 and PR2)

Procedures for entering and navigating parameter programming menus.

Moving Parameters Between Menus

How to move parameters between PR1 (user) and PR2 (hidden) menus.

Changing Parameter Values

Step-by-step guide to modifying parameter values.

Parameter List Overview

Defrost Control Functions

Energy Saving Function

Holiday Mode Activation

Remote Light Control

Remote On;Off Control

Parameter Map Change

Digital Inputs Polarity Configuration

Installation and Mounting Guidelines

Electrical Connections

Probe Connections and Placement

TTL;RS485 Serial Line Connection

Using the Hot Key

Alarm Signals and Messages

Serial Compressor and Modbus Fan Management Alarms

Buzzer Muting

EE Alarm (Data Integrity Failure)

Alarm Recovery Procedures

Wiring Diagrams

Default Parameter Maps (LT and NT)

Parameter List (LT Configuration)

Parameter List (NT Configuration)

Digital Input Menu Configuration

Serial Communication Menu

Settings for serial communication, including address and baudrate.

User Interface Menu

Configuration options for the user interface, including keyboard lock and button functions.

Energy Saving Menu Configuration

Parameters for configuring energy saving mode, including differential and timeout.

Real Time Clock Menu Configuration

Settings for the real-time clock, including date and time parameters.

Alarm Menu Configuration

Configuration for temperature alarms, alarm relay, and buzzer.

Digital Input Functions

Parameter List (LT Configuration - Part 2)

Parameter List (NT Configuration - Part 2)

Parameter List (LT Configuration - Part 3)

Parameter List (NT Configuration - Part 3)

Parameter List (LT Configuration - Part 4)

Parameter List (NT Configuration - Part 4)

Technical Data and Specifications

Relay Outputs Specifications

Details on the specifications of standard and optional relay outputs.

Analogue Outputs and Frequency Output

Information on analogue and frequency output capabilities.

Emerson Dixell XWi70K Specifications

General

Model	XWi70K
Series	XWi
Output Type	Relay
Mounting	Panel
Type	Electronic Controller
Input Type	NTC
Communication	Modbus RTU
Operating temperature	-10~60 °C
Housing	Plastic
Power Supply	12~24Vac/dc, 100~240Vac