Carbolite EZS Series - Manual (Page 22)

E range
22 MF65-1.01 MF65-1.00
7 CIRCUIT DIAGRAMS
7.1 Single Phase 200 to 240V wiring diagram for:
EHA12/150B to EHA12/600B & EVA12/150B to EVA12/600B
7.2 Three-zone models
The element circuit in the 3-zone versions remains the same as in diagram Figure 7-1 , but the
control circuit contains three controllers and additional thermocouples. The sub-circuits for the
three control methods referred to in section 3.3 are:
Control type B - the diagram is like C, plus the connections between the controllers indicated in
section 3.3 C.
7.3 Three-zone control – Broadcast Comms
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
+
–
+
–
+
–
+
–
HD
HE
centre
(master)
HD
HE
end
(slave)
HD
HE
HF
end
(slave)
Figure 7-1. Wiring diagram for the EHA and EVA models
Instrument Switch
coil
temperature
controller
thermocouple
Over-temp.
controller
thermocouple
heater
switch
lid
safety
switch
SSR
e
l
e
m
e
n
t
heat
on
F1
F2
N
L
PE
Filter
(if fitted)
contactor
e
l
e
m
e
n
t
fitted to split
tube furnace
only
customer
option