Carbolite TVS Series - Manual (Page 13)

HZS, TVS
MF24 – 3.44
13
7.4 Control by Broadcast comms (control method B)
When this is ordered there are three independent thermocouples (instead of the four shown)
connected to the three controllers; the controllers are linked together (not shown), and remain
“master” and “slave”.
The communication between the controllers of the Eurotherm 3000 series is known as Broadcast
comms. The wiring connections between the controllers are as follows:
7.5 Three-phase without neutral (delta, e.g. 208-240V)
7.6 Three phase without neutral (star – e.g. 380-415V)
The circuit is similar to 7.4, but the “neutral” ends of the
elements are not connected to a neutral terminal block.
The control circuit contains an isolating transformer to reduce
the control voltage to 240V or similar.
7.7 Higher Voltages (e.g. 254V)
For 254V or above, an isolating transformer is included
in the control circuit.
7.8 Model Configurations
These models normally have end zones of pair of elements each; the centre zone comprises the
remaining elements wired in parallel. By special order the zones can be of other lengths.
There are many possible electrical configurations for these models covering 1- 2- or 3-phase,
including 3-phase delta. Further information on the circuit diagram for a specific configuration can
be obtained from Carbolite (please state the furnace serial number).
HD
HE
HF
HD
HE
HF
HD
HE
HF
master
slave slave
e
l
e
m
e
n
t
(s)
e
l
e
m
e
n
t
(s)
Control circuit as for single
phase
SSR
heat
on
F3
F1
F2
F3
L2
L3
L1
PE
SSR
SSR
F3
heat
on
F3
e
l
e
m
e
n
t
(s)
heat
on
F3
F3
contactor
Filter (if fitted)
F2
F2
transformer
Instrument Switch