Eliwell EWTQ 905 Manual Download Page 1

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GENERAL DESCRIPTION
EWTQ 905 is a “single loop” digital microproces-
sor-based controller, with ON/OFF, Neutral Zone
ON/OFF, PID single action, PID dual action
(direct and reverse) control and with AUTO-
TUNING FAST function and SELF-TUNING
function for PID control.
The process value is visualized on 4 red displays,
while the output status is indicated by 2 LED
displays.
The instrument is equipped with a 3 LED pro-
grammable shift indexes.
The instrument can have up to 2 outputs: relay
type or can drive solid state relays type (SSR).
Depending on the model required the input
accept:
• C: Thermocouples temperature probes (J,K),

mV signals (0..50/60 mV, 12..60 mV),
Thermoresistances PT100.

• E : Thermocouples temperature probes (J,K),

mV signals (0..50/60 mV, 12..60 mV),
Thermistors PTC and NTC.

• I : normalized analogue signals 0/4..20 mA
• V : normalized analogue signals

0..1 V, 0/1..5V, 0/2..10 V

PROGRAMMING
FAST PROGRAMMING OF THE SET POINT
This procedure permits rapid programming of
the Set Point (SP1) and possibly the alarm
thresholds (AL1).
• Push key set, then release it and the display
will visualise “SP1” alternatively to the pro-
grammed value.
To modify the value, press “UP” key to increase
it or the “DOWN” key to decrease it.
PLEASE NOTE: These keys change the value one
digit at a time but if they are pressed for more
than one second, the value increases or
decreases rapidly and, after two seconds in the
same condition, the changing speed increases in
order to allow the desired value to be reached
rapidly.
• Once the desired value has been reached, by
pushing key set it is possible to exit by the fast
programming mode or it is possible to visualise
the alarm thresholds.
• To exit the fast Set programming it is neces-
sary to push key set, after the visualisation of
the last Set Point, or alternatively, if no key is
pressed for approx. 15 seconds, the display will
return to normal functioning automatically.

PARAMETER PROGRAMMING
By pushing key set and holding it down for
approx. 2 sec. it is possible to enter into the
main selection menu.
Using the "UP" or DOWN” keys, it is then possi-
ble to roll over the selections:
• "OPEr"

to enter into the operating parame-

ters menu;
• "ConF"

to enter into the configuration para-

meters menu;
Once the desired item has been selected, push
key set to confirm.

Selecting "OPEr" and "ConF" gives the possibili-
ty of accessing other menus containing addi-
tional parameters and more precisely :
• "OPEr" - Operating parameters Menu: this
normally contains the Set Point parameters but
it can contain all the desired parameters.
• "ConF" - Configuration parameters Menu: this
contains all the operating parameters and the
functioning configuration parameters.

To enter the menu “OPEr”, select the option
“OPEr” and press the key set and the display
will now show “0”.
By pressing the “UP” and “DOWN” keys please
set number (password) 381 (see last page) and
press “set” key.
If the password is not correct the instrument
will return in previous regulation status.
If the password is correct the display will show
the parameter’s code (“ ]SP “) (first parameters’
group). Again using the “UP” and “DOWN” keys,
it is possible to select the desired group of
parameters.

USER INTERFACE
1 - Key set : This is used to access the pro-
gramming parameters and to confirm selec-
tion.
2 - Key DOWN : This is used to decrease the
values to be set and to select the parameters.
If the key is held down, the user returns to
the previous programming level until he exits
the programming mode.
3 - Key UP : This is used to increase the val-
ues to be set and to select the parameters. If
the key is held down, the user returns to the
previous programming level until he exits the
programming mode.

Outside the programming mode it permits
visualisation of the output control power.
4 - Key F : This is a key that can be set to :
Activate Auto-tuning and Self-tuning func-
tions;In “ConF” mode can be used to change
parameters’ visibility
5 - Led OUT1 : indicates the state of output
OUT1
6 - Led OUT2 : indicates the state of output
OUT2
7 - Led SET : when flashing, it indicates
access to the programming mode.
8 - Led AT/ST : indicates that the Self-tuning
function is activated (light on) or that Auto-
tuning (flashing ) is in progress.
9 - Led – Shift index: indicates that the
process value is lower than the one pro-
grammed on par. “AdE”.
10 - Led = Shift index: indicates that the
process value is within the range [SP+AdE ...
SP-AdE]
11 - Led + Shift index: indicates that the
process value is higher than the one set on
par. “AdE”.