![Shuangri Electron SR258 Скачать руководство пользователя страница 22](http://html.mh-extra.com/html/shuangri-electron/sr258/sr258_operation-manual_1260877022.webp)
Manual of SR258 intelligent controller
21
►Press “▲/▼” to enter the forth digital
►Press “SET”, to access main menu
Through password set to limit the user to change some parameters, 4 digitals needed.
Default is 0000
If no pa
ssword is set, then just press “SET” five times to access main menu directly
7.2 LOAD tank heating
Function description:
△
T control logic
The controller works as a standard temperature differential controller. If the temperature
reaches or exceeds the switch-on temperature difference (DTO), the pump R1 switches on.
When the temperature difference reaches or falls below the adjusted switch-off temperature
difference (DTF), the respective relay of R1 switches off.
Note:
The switch-on temperature difference must be 0.5 K higher than the switch-off
temperature difference. The set temperature difference must be at least 0.5 K higher
than the switch-on temperature difference.
Speed control
If the temperature reaches or exceeds the switch-on temperature difference, the pump
switches on at 100% speed for 10s. Then, the speed is reduced to the minimum pump speed
value. If the temperature difference reaches the preset temperature difference, the pump
speed increases by one step (10%). The response of the controller can be adapted via the
parameter RIS. If the difference increases by the adjustable rise value RIS, the pump speed
increases by 10% until the maximum pump speed of 100% is reached. If the temperature
difference decreases by the adjustable rise value (RIS), pump speed will be decreased by
one step 10% accordingly.
Note:
To enable speed control function, the corresponding pump type has to be set to
(MIN, MAX) and relay control has to be set to (PULS, PSOL, PHEA or 0-10 V) (under
adjustment menu PUMP).
SMX Maximum tank temperature protection set
If the tank temperature reaches its adjusted maximum temperature, the tank will no longer be
loaded in order to avoid damage caused by overheating. If the maximum tank temperature is