ELECTRONIC CONTROL FOR TERMINAL UNITS
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II.3.5 ADVANCED FEATURES
II.3.5.1 Master/Slave connection
It is a particular function for which a control panel or receiver connected
to a fancoil Master, sends some information on the operation in
progress to other Slave devices (maximum 14) without control panel,
through an electrical connection to be carried out during installation
(see diagrams electrical).
For configuration, refer to II.3.6 Dip switches configuration.
Air probe: the regulation of all the units from the Master control
panel takes place according to two different modes.
On-board control panel
if AtS = 0 (air probe on board) every single appliance is regulated
by its ambient air probe, if the slave is not present then the slave is
regulated by the master probe, if the master probe is missing or
faulty E02 alarm and the system freezes.
if AtS = 1 (air probe on control panel) even if it is an unforeseen
combination, every single luminaire is regulated by the master air
probe of the master, if the slave is not present then the slave is
regulated by the master probe; the sensor of the master is missing
or faulty the alarm E02 appears and the system stops.
KPLT / KRLT command panel
if AtS = 0 (air probe on board) every single appliance is regulated
by its ambient air probe, if the slave is not present then the slave is
regulated by the master probe, if the master probe is missing or
faulty E02 alarm but the system adjusts to the KPLT / KRLT panel
probe.
if AtS = 1 (air probe on the control panel) every single appliance is
regulated by the internal air probe to the KPLT / KRLT control
panel (the slaves repeat the Master operation).
Water probe: the following two configurations are possible
- every appliance regulates on its own water probe;
- the water probe mounted on the Master is considered, in this case it
is necessary to disconnect the water probe on the Slaves.
If the probe of the Master is faulty or missing the alarm E03 appears
but the operation is still guaranteed because Hot start and Too cool
are not considered.
Control panel: displays only the condition of the Master.
Operating mode: the operating mode is managed by reading the probe
on the control panel or on the receiver or with the on-board probe on
the master. Therefore, in a master / slave network, in Auto mode, with
4-pipe units, mixed operation (one unit in heat and another in cold
mode) is not possible.
It is possible that there are units switched on (in the same mode) and
others switched off by set reached.
Alarms: the alarms are managed independently in each control
board.
Inputs: digital inputs can be local (Local) or global (Global):
- Local: acts only on the affected unit
- Global: acts on the whole network
The global SCR on the Master (D1) blocks the whole network, the SCR
on the Slave is inhibited.
The local EIR is not expected.
The global EIR on the Master (H12 = 1 D2, H13 = 1 D3) acts on the
whole network, the EIR on the Slave is inhibited.
The local SIC (H12 = 2 D2, H13 = 2 D3) is independent or only stops
the unit concerned (master or slave).
The global SIC on the Master (H12 = 3 D2, H13 = 3 D3) blocks the
whole network, the SIC on the Slave is inhibited.
The ECO local is not expected.
The global ECO on the Master (H12 = 4 D2, H13 = 4 D3) acts on the
whole network, the ECO on the Slave is inhibited.
The ALL local (H12 = 5 D2, 5 = 13 D3) is independent or only stops the
unit concerned (master or slave).
The ALL local EC motor (H12 = 6 D2) is independent or only stops the
unit concerned (master or slave).
The ALL global on the Master (H13 = 6 D3) blocks the whole network,
ALL on the Slave is inhibited.
NOTE: the configuration of the inputs described above must be
performed only on the master.
Dip-Switch: all the Dip Switchs present in the Slaves are
considered.
Timeout: The Slaves can not continue to operate without the Master
(due to lack of communication, fault or other) as no command would be
possible to the machines (On / Off, ...).
Thus, if a master message is not received for 7s, the slave is switched
off.
Hot start / Too cool: every fancoil is independent.
The control panel displays the status of the master only.
Master / Slave and external serial connection
A local Master / Slave network can be put into a serial network to be
managed by external bms but with the following constraints:
- the KIF485 serial card must only be mounted on the master
- the presence of the control panel or receiver is required
- the Slaves are managed by the master and not by the
external bms
Changing the parameters
Any change to the parameter values on the master is performed via the
network also on all connected slaves.
Maximum length
For the electrical connection of the network, the overall length of the
cable (from the control panel to the last slave), considering any
referrals, must not exceed 100m.
Connection between the boards
The connection between the boards in a master / slave network must
be carried out with a shielded cable consisting of 2 twisted conductors
of 0.5 mm² and the shield (recommended cable Belden 8762 20 AWG).
The screen must be connected to the GND terminal.
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