Page 34
USER MANUAL
Functioning description:
The unit set as Master talks constantly with connected slaves through RS485 sending them the
information about quantity steam to produce (0-100%) and managing various units priorities
related to de-concentration discharges or test.
Functioning mode of Master/Slave whole of units is set only on Master through variable S9 as
the eventual connection of ambient humidity sensor, of duct humidity sensor, of 0-10V
reference signal, the ON-OFF enabling and desired humidity value setting.
Pr variable, that represents the steam production percentage to maximum running, is instead set
on every single unit.
The enabling lack (terminal blocks 1 and 2 open on 100Master card) generates the following
actions:
- On Master unit stops the same Master unit and all connected slave units (displaying OFF
blinking).
- On Slave units stops only the concerned slave unit (displaying OFF blinking).
Stand-by inserting through dedicated key, generates the following actions:
- If actuated on Master unit, it puts the humidifier in stand-by (stand-by led blinking) and
brings to 0 the steam production request of connected slaves.
- On Slave units stops only the concerned slave unit putting in stand-by the humidifier (stand-
by led blinking).
If the Master does not find a slave, after a 15 sec. timeout time, signals the problem with a
silencing alarm message (E7). This alarm does not stop the normal functioning. The slave
polling continues and, if the communication starts again, the error is reset automatically.
If the Slave has not polled by the Master within a 15 sec. timeout time, it considers the
connection interrupted and it leads the steam production to 0 disconnecting the electrodes and
signaling the fault with silencing alarm (E8). In the case the connection starts again, the error is
reset automatically and the system starts its normal working.
On set Slave (mS=1) humidifiers S9 variable is not considered, steam production follows in
proportional mode the information sent to RS485 by Master.
De- concentration discharge and test priorities management:
De-concentration discharge and diagnostic tests priorities are managed as follow:
Slave units, when polled, send the eventual discharge request to the Master that manages them
FIFO (first input / first output).
The Master waits for 3 minutes before giving the next enable to pending unit following the
FIFO priority; this procedure permits to currently discharging unit to start again the steam
production.
The Slave unit that has requested a discharge wait for Master enable for 45 minutes and when
they are passed the discharge will still be executed (Time out).
To Next Page
Loading...
Need help?
General
