CWF, BWF, RWF
C
IRCUIT
D
IAGRAMS
Safety Switches type A, up to 25A rating: two Door Switches directly in the element circuit.
Safety Switch type B, over 25A rating: a single Door Switch in the contactor coil circuit.
EMC Filters (if fitted): dependent on the model there may be one filter, or more than one fitted in
parallel. The circuit diagram examples do not show multiple filter arrangements.
7.1
Single Phase
NOTE – year 2001 onwards: single phase model --/23 replaced by Universal model – see 7.4.
Supply light
Instrument Switch
coil
temperature
controller
overtemp.
controller
safety
switch B
thermocouple
PE
L
N
SSR
e
l
e
m
e
n
t
(s)
F3
F3
safety
switches A
F1
F2
thermocouple
if fitted
Filter (if fitted)
contactor
if fitted
heat
on
7.2 2-phase with neutral
Please enquire if a diagram is required.
7.3 Higher Voltages (e.g. 254V; 440V, 480V 3-phase)
The diagram above (7.5) normally applies, with neutral (if present) not being used.
For single phase models of 254V or above, diagram 7.1 or 7.4 applies except that a control circuit
transformer is included as in diagram 7.5.
12
MF02