Carbolite HTMA Series - Manual (Page 12)

High Temperature Ovens
12
MF16 3.09
7.0 C IRCUIT D IAGRAMS
7.1 Single Phase
7.2 Two-phase with Neutral
As 3-phase with neutral (7.4), but with phase L3 not present, and with two SSRs and element
circuits.
7.3 Three Phase with Neutral
coil
Instrument Switch
temperature
controller
SSR
e
l
e
m
e
n
t
(s)
F1
F2
N
L
PE
Filter (if fitted)
thermocouple
circulation
fan
overtemp.
controller
thermocouple
relay or
contactor
case cooling
fans
(if fitted)
Instrument Switch
e
l
e
m
e
n
t
(s)
F1
F2
N
L1
PE
Filter (if fitted)
contactor
SSR
SSR
SSR
e
l
e
m
e
n
t
(s)
e
l
e
m
e
n
t
(s)
instrument and fan
circuit as above
L2
L3
note on 2- or 3-phase: depending on EMC filter, there may be 2 or 3 neutral wires
from the elements to the filter and terminal blocks
if overtemp
fitted