Carbolite GVC Series - Manual (Page 16)

G range
16 MF48 -1.18
3-phase without neutral (delta)
In most instances this diagram does not apply. See 7.7. It may apply if non-standard models are
ordered.
7.5 Higher Voltages
For 254V or above 1-phase or 440/254V or above 3-phase an isolating transformer is fitted in the
control circuit after the F2 fuses.
This addition may be applied to diagrams 7.1, or 7.3.
7.6 Three-Zone models
The element circuit in the 3-zone versions remains the same as in diagrams 7.3, 7.4 or 7.7, but the
control circuit contains three controllers and additional thermocouples. The sub-circuits for the
three control methods referred to in section 3.2 are:
Control type B - the diagram is like C, plus the connections between the controllers indicated in
section 3.2 C.
slave
controller
thermocouples
SSR
master
controller
SSR
SSR slave
controller
centre
end
end
Control type A Control type C
slave
controller
thermocouples
SSR
master
controller
SSR
SSR slave
controller
main
ref.
slave
slave
+
–
+
–
+
–
+
–
e
l
e
m
e
n
t
(s)
e
l
e
m
e
n
t
(s)
Instrument Switch
coil
temperature
controller
overtemp.
controller
thermocouple
heater
switch
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
if fitted
thermocouple
contactor
Filter (if fitted)
F2
F2
transformer
Instrument Switch