Eliwell EWDR 981 User Manual

USER INTERFACE

The user interface has a 4 LED display to
indicate status and alarms and four buttons
for controlling instrument status and pro­gramming.

KEYS

UP Increase in value of

parameter
Menu scrolling and
activation of defrost
function
(Parameter programmable
H31)

DOWN Decrease in value of

parameter
Menu scrolling and
activation of associated
function
(Parameter programmable
H32)

set Access to different levels of

menu
Alarm display, set
point and probes
Access to programming of
parameters

fnc Exit current level of

menu
Confirmation of value of para­meter
(Parameter programmable
H33)

SIGNAL LED

The status of the external devices, functions
and controllers is described by the device
LEDs.

DISPLAY

This is used to display the inputs, the set
point, the parameters and related values,
alarms, functions and the status of the
device.

DESCRIPTION OF MENU

Access to both menus is controlled by
the ‘set’ button. If it is pressed and
immediately released, the ‘machine
status menu‘ is displayed. Hold the same
button down for 5 seconds to access the
‘parameter programming menu‘.
When one of the two menus has been
accessed, you can navigate between the
level 1 folders using the ‘UP’ and ‘DOWN’
buttons. The folders are opened by
pressing the ‘set’ button once. You can
now scroll through the contents of each
folder, modify it or use its functions.
You can exit each level of both menus in
three ways: using the ‘fnc’ button, if a
new value is confirmed by pressing the
‘set’ button or, when the time-out has
elapsed (15 seconds inactivity on the
device).

MACHINE STATUS MENU

The ‘machine status menu’ contains the
folders and basic information on the
device:

-AL: alarm folder

-SEt: Set point setting folder

-Pb1: ‘probe 1 value’ folder

-Pb3: ‘probe 3 value’ folder

If no alarms are present, the “SEt” label
is displayed. From here, you can scroll
down the other menu items using the
UP’ and ‘DOWN’ buttons.
Each folder can be accessed by pressing
the ‘set’ button once. Values are
modified using the ‘UP’ and ‘DOWN’
buttons and the ‘set’ button that
confirms the selected value and takes
you back to the higher level.

Setting the set point

Access the ‘machine status menu’. If no
alarms are present, the “SEt” label is
displayed. By pressing and immediately
releasing the ‘set’ button, the set point
value can be set using the UP’ and
‘DOWN’ buttons. Press and release the
‘set’ button again or press the ‘fnc’
button to go back to the main menu
level. The set point setting folder is also
closed when the time-out elapses.

Alarm on

If an alarm condition exists when the
Machine Status menu is accessed the
“ALfolder label appears.

PARAMETER PROGRAMMING MENU

Access the menu by pressing the ‘set’
button for at least 5 seconds.
The menu structure enables all
parameter folders to be divided into two
levels.
All the level 1 folders can be accessed
by entering the password ‘PA1’.
Scroll down the level 1 folders using the
‘UP’ and ‘DOWN’ buttons. Press and
release the ‘set’ button next to the
selected label to access the parameters.
Scroll through the labels in the folder
using the ‘UP’ and ‘DOWN’ buttons,
press ‘set’ to display the current value of
the selected parameter, use the ‘UP’ and
‘DOWN’ buttons and set the required
value by pressing ‘set’.
To access the level 2 folders in the ‘Cnf’
folder, select the ‘PA2’ label, enter the
password ‘PA2’ and confirm with the ‘set’
button. All the parameters that cannot
be changed at level 1 are in this level.

NOTE: Level 1 parameters will only be
displayed if you quit the ‘parameter
programming menu’ and repeat the
steps for manipulation of level 1
folders.

The steps to follow for manipulation of
level 2 parameters are the same as those

NOTE: It is strongly recommended
that the instrument is switched off
and on again each time parameter
configuration is changed in order to
prevent malfunctioning of the
configuration and/or ongoing timings.

PASSWORD

The passwords “PA1and “PA2” are used
to access level 1 and level 2 parameters.
To change them and assign them the
desired value, access the ‘parameter
programming menu’ in the “diS” label
folder.

The password is requested:

- PA1 when entering the ‘parameter
programming menu’;

- PA2 in the “Cnf” folder containing the
level 1 parameters.

USING COPY CARD

The Copy card function can be used to
upload and download parameter maps
of one or more of the same type of
instrument.
The accessory is connected to the device
using the special TTL serial port on the
instrument. The Copy card can be used
for the following functions:

EWDR 981

electronic controllers for refrigeration units

cod. 9IS43091

rel. 3/05

GB

LED Description Indication

reduced set point Lights up when
inserted LED set point is dis-

played, blinking
when reduced set
point is inserted

compressor LED ‘on’ with LED on.

Blinking for delay,
protection or acti­vation blocked

defrost LED ‘on’ during defrost-

ing. Blinking when
activated manually
or by digital input

alarm LED ‘on’ if alarm is pre-

sent. Blinking for
silenced

alarm decimal point ‘on’ to indicate of

voltage when on
stand-by and dis­play ‘off’

Upload (UL): The upload function reads
the instrument parameters and writes
them onto the Copy card
Download(dL): The download function
writes the parameter map that is on the
copy card at that time onto the
instrument memory.

NOTE:
Upload = instrument—-> Copy card
Download = Copy card —> instrument

The operations are performed by
accessing the folder with the ‘FPr’ label
and selecting the ‘UL’, ’dL’ or ‘Fr’
commands. The operation is confirmed
by pressing the ‘set’ button. If the
operation is successful, a “y” is displayed
whereas if it is unsuccessful an “n” will
be displayed.

Formatting the copy card

This function is necessary when using the
copy card for uploading for the first
time or when using the copy card on
device models that are not compatible.

NOTE: formatting deletes all the data
on the Copy card and cannot be
undone.
Download from reset

Once the copy card has been connected
the instrument is switched on. When the
lamp test is over, one of the following
two labels will be displayed for 5
seconds:

- dLY if the operation is successful

- label DLn if operation fails The display
will then go into default position (probe
or set point).

NOTE: after downloading, the
instrument will begin to work with
the new parameter map that has just
been downloaded.

ADVANCED FUNCTIONS

DOOR SWITCH INPUT

This is a clean contact digital input with
programmable polarity. The door switch
input functions are controlled by the
values of the following parameters:

Parameter H11 is used to configure the
door switch input with values between

-8 and +8. Positive and negative values
are present in order to select the
polarity assigned to the input and:

NOTE: the sign “-” indicates that the
input is activated when the contact is

closed.
The ‘+’ sign indicates that the input is
activated when the contact is open

LIGHT CONTROLLER

Controls the light relay. The function can
be started in two different ways. If you
press the light button the light relay is
switched on if it was off and is switched
off if it was on.
The light status is recorded by the
device as soon as the button is pressed
so that when power is restored after a
black-out the device can continue to
operate in the same way as before the
power failure.
The following parameters control how
the light works:

The configuration of these parameters
controls the status of the light relay by
using the digital input as well as the
normal button.
The parameter dSd automatically
switches on the light relay when the
digital input is enabled and switches it
off when the digital input is disabled
following the delay set by parameter dLt.
Parameter H06 activates the light button
and enables the relay when the door is
open even when the instrument is
powered but is ‘off’.
The dedicated button always deactivates
the light relay even if the digital input is
on or during the dLt delay only if the
parameter OFL=Y.

DIAGNOSTICS

PROBE ALARMS

When one of the probes is outside the
nominal operating range or the probe is
open or has shorted, an alarm is
generated if at least one of these
conditions persists for at least 10
seconds.
If at least one of these 3 alarms is
signalled the alarm LED and relay are
enabled. When activated code E1
appears on the display.

If several alarms are activated at the
same time, they are displayed alternately
for 2 seconds each. An error condition
in the room probe leads to:

- E1 code appears on display

- activation of compressor as indicated
by Ont and OFt

- deactivation of maximum and
minimum alarm controller.

MINIMUM AND MAXIMUM
TEMPERATURE
ALARM

The alarm is regulated on the room
probe. The temperature limits are
defined by parameters HAL and LAL. The
limits refer to the set point if parameter
Att=1 and are absolute if Att=0.

NOTE: If the alarms are relative, the
parameter HA1 is set to positive
values and LA1 to negative values.

ALARM WITH THRESHOLD REFERRING
TO PROBE 3

An alarm is associated with probe 3 that
refers to a threshold that is reset at a
specified differential.
By setting parameter PbA=3 probe 3 will
signal a high or low temperature alarm
for exceeding the set value.

The alarm is handled in the same way as
the other temperature alarms and
standard signal delays are used.

EXTERNAL ALARM

It is set if the digital input is enabled
with the delay specified by parameter
dAd and remains enabled until the next
time the digital input is deactivated. The
alarm consists of an alarm LED that
remains on, activation of a buzzer and
deactivation of all the device loads (if
specified by the EAL parameter).
If an external alarm is present the EA
label is displayed in the AL folder.

It is reset the next time the digital input
is deactivated and the buzzer can be
manually silenced.

Par Description

dOd Digital input switches off loads
dAd D.I. activation delay
OAO Alarm signal delay after dis-

disabling the digital input (door closed)

tdO Time out door open. Time out

signal after activation of D.I.

(door open)
H11 Digital output configurability/polarity 1
H21...H25 Digital output configurability 1...5

Par Description

H06 Button/aux input/door switch light active

when instrument off
dSd Enabling light relay by door switch
dLt Delay Light Relay

deactivation delay
OFL Light switch always disables light relay
OAO Alarm signal delay after

disabling the digital input

(door closed)
tdO Time out door open.

Time out signal after activation of D.I.

(door open)
H11 Digital output configurability/polarity 1
H21...H25 Digital output configurability 1...5

Signal Description

E1 Faulty room probe
E3 Faulty display probe

EWDR 981 2/8

Att=0
absolute

Maximum temperature alarm
room probe temperature ≥ HAL

Minimum temperature alarm
room probe temperature ≤ LAL

Att=1
relative

Maximum temperature alarm
room probe temperature ≥ Set + HAL

Minimum temperature alarm room
probe temperature ≤ Set + LAL

Signal Description
AH3 High temperature alarm
AL3 Low temperature alarm

Signal Description
EA External alarm

OPEN DOOR ALARM

This alarm is generated when the door is
open for longer than the value specified
in parameter tdO. The door open alarm
is signalled in the alarm folder (AL) and
the LED and alarm relay are switched on.
The OPd label is also displayed.

The relay can be deactivated by pressing
the silencing button. The LED continues
to flash intermittently and the OPd label
remains in the alarm menu until the
door is closed.

MECHANICAL
ASSEMBLY

The EWDR 981 is designed to be wall­mounted (removable brackets) or
mounted on DIN rail (Omega 3). The
unit operates correctly with an ambient
temperature range of between -5 and 55
°C. Units must not be installed in
excessively humid and/or dirty locations.

TECHNICAL DATA

Casing: plastic 4 Din modules
Dimensions: front 70x85 mm, depth
61mm.

Mounting: on DIN rail (Omega 3) or
wall-mounted.
Connections: on screw terminal block for
≤ 2.5mm

2

conductors
(only one conductor per terminal block
for power connections)
Operating temperature: -5...55°C.

Storage temperature: -30...85°C.
Operating and storage ambient humidity:

10...90 % RH (non-condensing).
Display: 3 digits + sign

Analogue inputs: 2 NTC/PTC inputs
(parameter configurable)

Digital inputs: 2 voltage-free parameter­configurable digital inputs.

Serial: TTL for Copy Card

Digital outputs: 1 on relay:
16A 1hp 250V SPDT;

Configurable 12Vc/24mA output
Resolution: 1 or 0.1°C.

Accuracy: better than 0.5% of bottom
scale +1 digit

Consumption: 5VA

Power supply: 230Va

ELECTRICAL
CONNECTIONS

Warning! Always switch off machine
before working on electrical
connections.

The instrument has screw terminal blocks
for connecting cables with a maximum
diameter of 2.5 mm

2

(only one conductor
per terminal block for power
connections): for terminal capacity, see
the label on the instrument.
The relay outputs are voltage free.
Do not exceed the maximum current
allowed. For higher loads, use a suitable
contactor.
Make sure that the power voltage
complies with the device voltage.
Probes have no connection polarity and
can be extended using an ordinary
bipolar cable (note that if probes are
extended this affects the electromagnetic
compatibility (EMC) of the instrument:
special care must be used when wiring).

The TTL serial cable must be kept
separate from the power cables.

EWDR 981 3/8

CONDITIONS OF USE

PERMITTED USE

For safety reasons the instrument must
be installed and used in accordance with
the instructions supplied.
Users must not be able to access parts
with dangerous voltage levels under nor­mal operating conditions. The device
must be suitably protected from water
and dust depending on the specific
application and only be accessible using
special tools (except for the front key­pad).
The device is ideally suited for house­hold use and/or similar use in the refrig­eration sector and has been tested with
regard to safety in accordance with the
European harmonized reference stan­dards. It is classified as follows:

• as an automatic electronic control
device to be independently mounted as
regards its construction;

• as a 1 B type operated control device
as regards its automatic operating fea­tures;

• as a Class A device as regards the cate­gory and structure of the software.

UNPERMITTED USE

The use of the unit for applications
other than those described above is for­bidden. It should be noted that the relay
contacts supplied with the device are
functional and therefore exposed to
potential faults. Any protection devices
required to comply with product
requirements or dictated by common
sense due to obvious safety reasons
should be installed externally.

RESPONSIBILITY AND RESIDUAL RISKS

Eliwell shall not be liable for any damages deriving from:

- installation/use other than that prescribed and, in particular, which does not comply
with the safety standards specified in the regulations and/or those given herein;

- use on boards which do not guarantee proper protection against electric shock, water
or dust when assembled;

- use on boards which allow dangerous parts to be accessed without the use of tools;

- tampering with and/or alteration of the product;

- installation/use on boards that do not comply with the standards and regulations in
force.

Signal Description
OPd Open door alarm