Robur Roburbox100, Инструкция по установке и эксплуатации

Страница: 22 / 84

RB100 : Installation and Use Manual
16 Ed. 06/2014 – FW version 1.002
If no request arrives from RB100, it does not mean that DDC-controlled units
remain off; this depends on the set-up of a specific menu on the Control Panel [ref.
to DDC Installation Manual (D-LBR 273) and DDC Use and Programming Manual
(D-LBR 249)] which allows system to operate with the only requests coming from
RB100 or with the only DDC internal request or both.
¾
Input configured as analogue setpoint:
•
Depending on input voltage value, turning-off or setpoint request is sent to Control
Panel.
If input voltage is lower than -0.3 V or higher than 10.3 V, a proper out-of-scale
error code is displayed. (APPENDIX on page 72).
Example of analogue input management
For convenience, we refer to heating operation, but the same principle applies to all
request services (attention: if plant operates in cooling, temperature is managed by the
opposite logics).
Example:
Settings
PARAMETERS
VALUE
WATER THERMOSTAT ADJUSTMENT (set on DDC)
DELIVERY
TEMPERATURE CORRESPONDING TO MINIMUM SETPOINT (setpoint sent from RB100
to DDC when input voltage is 0V)
+40°C
TEMPERATURE CORRESPONDING TO MAXIMUM SETPOINT (setpoint sent from RB100
to DDC when input voltage is 10V)
+80°C
TEMPERATURE CORRESPONDING TO REQUEST OFF (the request sent from RB100 to
DDC when input voltage equal to or lower than is 2.5V is MACHINES OFF)
+50°C
DIFFERENTIAL (set on DDC)
-10°C
Operating sequence
•
an input reaches hot service on RB100 interface equal to 10V;
•
the +80°C setpoint request is sent to DDC (value set);
•
DDC turns on hot machines (if plant is switched to heating, otherwise non-available
service relay activates (APPENDIX on page 72);
•
machines are operating: plant water heats up to setpoint temperature = +80°C;
•
machines turn off: plant water, returning from line, gradually cools down to 70°C =
80°C – 10°C (se differential);
•
DDC restarts the machines: plant water heats up again.
•
The cycle repeats until the service input corresponding to the request (in this case
the hot service) has 10V voltage; if voltage decreases to 2.5V, no setpoint request
reaches DDC and DDC-controlled units turn off.
•
For each input voltage value between 2.5V and 10V, the corresponding setpoint
(e.g.: 7.5V = +70°C) is sent to DDC, which controls machines to meet such
temperature value.