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 wall-
mounted (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 sign
Analogue inputs: 2 NTC/PTC inputs
(parameter configurable)
Digital inputs: 2 voltage-free parameter-
configurable digital inputs.
Serial: TTL for Copy Card
Digital outputs: 1 on relay:
16A 1hp 250V SPDT;
Configurable 12V
c
/24mA output
Resolution: 1 or 0.1°C.
Accuracy: better than 0.5% of bottom
scale +1 digit
Consumption: 5VA
Power supply: 230V
a
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 nor-
mal 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 key-
pad).
The device is ideally suited for house-
hold use and/or similar use in the refrig-
eration sector and has been tested with
regard to safety in accordance with the
European harmonized reference stan-
dards. 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 fea-
tures;
• as a Class A device as regards the cate-
gory and structure of the software.
UNPERMITTED USE
The use of the unit for applications
other than those described above is for-
bidden. 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
