Carbolite HTMA Series - Manual (Page 13)

High Temperature Ovens
MF16 3.09
13
7.4 Three Phase without Neutral (delta e.g. 208-240V)
7.5 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.
7.6 Higher Voltages (e.g.254V)
The control circuit contains an isolating transformer to reduce
the control voltage to 240V or similar.
7.7 Stoving & Curing
The following addition is made to the circuit.
Instrument Switch
e
l
e
m
e
n
t
(s)
F1
F2
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
F2
F2
transformer
Instrument Switch
control circuit
Fan Motor
exhaust Fan
Fault light
COIL
Pressure
Switch
o/temp if
fitted
element circuit
Relay or Contactor