CONFIGURATION MODE 1 CONFIGURATION MODE 3
CONFIGURATION MODE 2
Internal probe Internal probe
Internal probe
Additional probe Additional probe
Additional probe
Ratio between probes Ratio between probes
Ratio between probes
Used Not used
Used
Disabled Connected or by bus
Received by bus
NA. (100% internal) 100% external
10 % to 90%
Measure of temperature is performed every 60 seconds; if
the temperature probe is disconnected or in short circuit the
control action is interrupted and the controlled actuators are
switched o.
probe disconnection / short circuit / out of range measure-
ment:
Obj #15 “Actual temperature” transmits 0 °C
Obj #33 “Temperature sensor alarm transmits “1”
If the additional temperature is out of range or the surveil-
lance time expires without any message received, thermostat
stops the control action and the controlled actuators are
switched o.
If internal probe is anyway connected (but not used until ad-
ditional probe is working good) then in event of failure of the
additional probe the internal probe is used (see behaviour of
conguration mode 1).
When additional probe begin to measure a “in-range” value
thermostat start again its control action and return to consi-
der the additional probe.
Measure of internal temperature is performed every 60 se-
conds; the additional temperature is read every 60 conside-
ring last value received on Obj #16 “Additional temperature”.
The value of temperature sent on the bus is the pounded
average between internal and additional probes value.
If the additional temperature is out of range or the surveil-
lance time expires without any message received, thermostat
start considering only the internal probe until it receives a
new valid value from the additional probe; in this case the
additional value is taken in count again.
Anyway, if the internal temperature is out of range or probe
is disconnected / short circuit then the control action is inter-
rupted and the controlled actuators are switched o:
Obj #15 “Actual temperature” transmits 0 °C regardless the
value received from additional sensor.
Obj #33 “Temperature sensor alarm transmits “1”
When internal probe starts again to measure a “in-range”
value thermostat start again its control action.
16
To Next Page
Loading...