Robur Direct Digital Controller - Page 146

Direct Digital Controller
144 Direct Digital Controller fw 4.013 – Ed. 01/2013
The plant may be activated only if either of the following conditions applies:
 The ON/OFF master switch and at least one of the partial ON/OFF switches are in ON position and the
temperature of the external environment is lower (heating) or higher (cooling) than the external
environment set-point set (see paragraph 3.4.1.3.1 Set point on page 46); moreover the system uses the
water set-point calculated on the basis of the climatic curve.
4.5.3.1.7 Instructions for operation in MONITOR mode
In Monitor operating mode the DDC does not switch on the machine, which is done using the contacts in the
electronic board on the machine: in this case the switch on/off logic is defined by the user.
The other functions of the DDC are fully usable and therefore allow the viewing of the operating data and
specific data concerning the units, as well as any warnings or alarms (also shown in the event history). It is
also possible to reset any anomalies or flame arrests, and view and if required edit the machine parameters
(authorised Technical Assistance Centres only). Per further information contact ROBUR’s Technical Support
Centre (CST).
4.5.3.1.8 Instructions for operation in CUSTOM mode
In CUSTOM operating mode, the user may choose freely the on/off commands that determine the switching
on and off of the machines.
The figure on the right shows the on/off commands available in CUSTOM
operating mode. The
symbol located next to the text description of the
command indicates that the command is disabled. To enable the
command, position the cursor on
and press the knob. The symbol
indicates that the command has been enabled.
The on/off commands available in CUSTOM mode are:
GenPwr Plant master switch for switch-on and switch-off;
GrpPwr Partial plant on/off switch (Multi DDC plants only);
GenTmr General water T timer on switch;
GrpTmr Partial water T timer on switch (Multi DDC plants only);
ChronT Chronothermostat;
WeComp Climatic curve function
ExtT Consent for switch-on and switch-off depending on the
External Temperature;
RY-RW External RY-RW on/off commands;
AutoYW Automatic COOLING/HEATING mode switching (two-line
hot/cold plants only).
Thus it is possible to combine even all of the on/off commands available (e.g. chronothermostat, water T
timers and external contacts) or to exclude some of them selectively (e.g. general water T timers enabled,
partial water T timers not enabled, etc.).
It is not however possible to select the "WeComp" function at the same time as the “GenTmr” or “ChronT” consent.
When plant configuration is complete, it is always necessary to set the following parameters:
 Default set point see paragraph 3.4.1.1.1.1 on page 31;
 Water Differential see paragraph 4.4.2.6.1 on page 93 and, for separable plants, paragraph 4.4.2.5.3 on
page88;
 Regulation parameters see paragraph 4.4.2.6.4 on page 96 and, for separable plants, paragraph
4.4.2.5.4 on page89;
 General water T timer see paragraph 3.4.1.1.1.3 on page 34 (if enabled);
 Partial water T timeri (Multi-DDC plants only) see paragraph 3.4.1.1.1.4 on page 35 (if enabled);
In the presence of third party boilers:
 Auxiliary boiler operation see paragraph 4.4.2.6.2 on page 94;