Const; Hs = Hysteresis; Pi = Proportional-Integral Control; Pid = Proportional-Integral-Derivative Control - ELEKTROBOCK PT32 GST Manual

CONST

(CONSTANTS)
Setting the control parameters.
Press twice the " MENU " button, choose the CONST mode by turning the"
button to confi rm.
1
ENGLISH
(English language set by default)
Language selection (CZ/PL/EN/DE/RU/SVK).
Choose the language by turning the "
2
MINIMUM CONTROL TEMPERATURE
Setting the limit of the minimum temperature which can be set. If using the GSM module, you will be
informed by an SMS that the room temperature has dropped below this value (check CONST tEL nO,
page 7). Choose within the range from 3 °C to 10 °C (by 0.5 °C).
Set the value by turning the "
3
MAXIMUM CONTROL TEMPERATURE
Setting the limit of the maximum temperature which can be set. If using the GSM module, you will be
informed by an SMS that the room temperature has risen above this value (check CONST tEL nO,
page 7).Choose within the range from 15 °C to 39 °C (by 0.5 °C).
Set the value by turning the "
CONTROL TYPE
4
Selection of the control type:
Choose the type of control by turning the "

HS = Hysteresis

Difference between the desired and current temperature.
If the hysteresis is 1 °C and the desired temperature is 20 °C, the thermostat switches off at 20 °C, and on at 19 °C (see the graph).
For correct hysteresis function, set the parameters according to the heating system type; see CONST 5.
Note: If hysteresis is selected, CONST 6 is skipped automatically.

PI = proportional-integral control

The PI-control principle consists in comparison of the current room temperature with the desired temperature.
The PI-control aims at achieving and maintaining the desired temperature without overshooting (see the graph). For correct function of the
PI-control, set the control parameters according to the type of the heating system with respect to the room thermal inertia;
see CONST 6.
Note: If the PI-control is selected, CONST 5 is skipped automatically.

PID = proportional-integral-derivative control

The PID-control principle consists in continuous comparison of the current room temperature with the desired temperature,
and automatic adaptation of the controller to the given conditions.
This is the most perfect continuous control; you can achieve not only short control time, but also high accuracy without permanent con-
trol deviation. The minimum switch-on time is internally set to 2 minutes, the proportional band is 2 °C, the time interval is automatically
recalculated according to current temperature conditions.
Note: If the PID-control is selected, CONST 5 and CONST 6 are skipped automatically.
HYSTERESIS
T
desired
temp..
Heating
ON
Note: The graphs are just tentative; the real control course differs according to current conditions in the measured object!
CAUTION!
ONLY IN CASE OF LOCKING BY PASSWORD (see CONST19)
If the " " key symbol appears on the LCD, the constant selected cannot be modifi ed and you must know the
PASSWORD (see CONST 19, page 8). You can change the constant after entering the password. After you exit the
CONST mode, the security lock of the constants related to the control will be activated automatically.
" button and press the "
(5 °C set by default)
" button and press the "
(39 °C set by default)
" button and press the "
(PID control set by default)
" button and press the "
T
desired
temp.
hysteresis
t
Heating
ON
t
" button, and press the "
" button to confi rm.
" button to confi rm.
" button to confi rm.
" button to confi rm.
PI-CONTROL
proportional
band
t
t
"
CONSTANTS
TYPE OF REGUL.
PID-CONTROL
T
desired
temp.
Heating
ON
TYPE OF REGUL.
TEMP.
TEMP.
t
t
5