2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
3.18-1
3.18
3.18
230V / 400 V operation
The analyser is usually operated on 3 phases and neutral.
The transformer for the furnace is powered by two of the three phases ( 400 V ).
The third phase and neutral are used to supply the rest of the analyser with 230V,
( electronic unit, detectors, fans etc. ).
However, if there is only one phase available, then the analyser can be changed for single
phase operation.
If necessary, this conversion can be done at the customer´s site.
Converting the analyser to single phase ( 230 V ) supply:
Disconnect the mains plug and open it up
Connect both black cables together to the 230V phase
Join the brown and the blue cable and connect them to the neutral
The yellow / green cable is of course connected to earth
Rearrange the connection of the power transformer, according to the following
instructions:
32A
2 A
100 0A
b r
bl
sw
bl
b r
sw
rt
g r
bl
o r
br
0V
40 0V
E le ct ro ni c
d ra w
Setting 2
Ca rrier
gas
st op
Sett ing 1
120 44
230V
Pr i
Se c
8
7
vi sw
6
230VAC
3 35 0 0
Thyristo r
b lock
24V DC
Mains power switch
RF filter
Solid state
rel ais on ON 21
L2
L3
32A
N
L1
ge/ gn
transformer
Furnace
power
Coolin g fans
Wate r
p ump
5
34
2
1
Ph ase sy nchro nisation
TC
Cell
IR
Ce ll
Connect blue with brown and black with black (in the power plug)
Connect phase transformer to 230V
Use 1000A power transformer with 230V primery coil
For 230V AC (single phase) operation:
Phase
transformer
32066
PW13
16100
NK31
G as pump
0 92 70
i n p u to ut p u t
NR32
15038
GND
-15
+1 5
24VAC
sw
blue
brown
yellow
grey
green
orange
pink
red
black
violett
white
bl
br
ge
gr
gn
or
rs
rt
sw
vi
ws
ON 900 Simplified wiring diagram
32012
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