MINIMUM AND MAXIMUM TEMPERA-
TURE ALARM
If an alarm condition occurs and alarm
exclusion times are not in progress (see
alarm exclusion parameters), the alarm
icon lights up permanently and the relay
that is configured as an alarm is activated.
This type of alarm does not affect the reg-
ulating in progress.
Alarms are considered as absolute
(default) values or as values related to the
Set point (the distance from the Set point
itself) and based on the Att parameter.
If the alarms are relative (Att=1), the para-
meter HA1 is set to positive values and
LA1 to negative values.
This alarm condition can be viewed in the
folder “AL” with labels “AH1-AL1”.
CLOCK BATTERY ALARM
This alarm is activated in the following
situations:
- when the instrument is switched on for
the first time and the clock is set
- when the instrument is switched on
again after a power off lasting more than
24/32 hours.
The alarm will stop as soon as the
day/hour/minutes are set using the set
parameters.
Resetting is automatic and there is no
need to restart the instrument.
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 stan-
dard signal delays are used.
DEFROST ALARM
If defrosting does not reach the end of
cycle temperature but is terminated by a
time out, the alarm controller is immedi-
ately activated.
An alarm LED remains on and the alarm
is recorded in the Ad2 label alarm menu.
The alarm is automatically reset as soon
as the next defrost cycle starts. The
alarm LED can only be manually
switched off with a silencing procedure.
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.
OPEN DOOR ALARM
This alarm is generated when the door is
open for longer than the value specified
in parameter tdO.
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 983-985/CS (LX) - EWDR
985/CSK (LX)
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 loca-
tions.
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 com-
plies with the device voltage.
Probes have no connection polarity and
can be extended using an ordinary bipo-
lar cable (note that if probes are extend-
ed this affects the electromagnetic com-
patibility (EMC) of the instrument: special
care must be used when wiring).
The RS-485 serial and TTL serial cables
must be kept separate from the power
cables.
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: 3 NTC/PTC inputs
(parameter configurable)
Digital inputs: 2 voltage-free parameter-
configurable digital inputs.
Serial:
-TTL for Copy Card
-RS485 for connection to Televis
System
(for /CS LX - /CSK LX models only)
Digital outputs:
EWDR 983 (/CS LX):
2 digital outputs on relay:8A 1/2hp 250V
SPDT; 16A 1hp 250V SPDT;
EWDR 985 (/CS LX):
4 digital outputs on relays: 8A 1/2hp
250V SPST; 8A 1/2hp 250V SPDT; 16A
1hp 250V SPST; 8A 1/2hp 250V SPST.
Configurable 12V
c
/24mA output
EWDR 985/CSK (LX):
4 digital outputs on relays: 8A 1/2hp
250V SPST; 8A 1/2hp 250V SPDT; 16A
1hp 250V SPST; 8A 1/2hp 250V SPST.
Link: Output for Link network
Resolution: 1 or 0.1°C.
Accuracy: better than 0.5% of bottom
scale +1 digit
Consumption: 5VA
Power supply: 230V
a
EWDR 983-985/CS (LX) - EWDR 985/CSK (LX)
3/12
DISPLAY
AH1
AL1
AH3
AL3
Ad2
EA
Opd
E7*
Press any button to silence the alarm. The LED will
start to blink. If simultaneous, they will be showed
on the display alternately every 2 seconds
*ONLY FOR EWDR 985/CSK (LX)
In the event of addressing errors, E7 will not be
shown, but the display will blink.
ALARM
High temperature alarm (referring to
room probe or probe 1)
Low temperature alarm (referring to
room probe or probe 1)
High temperature alarm (referring to
probe 3)
Low temperature alarm (referring to
probe 3)
Defrosting timed out
External alarm
Door Open Alarm
Master-Slave Communication failure
