2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
1.13-1
1.13
1.13
No furnace power during the analysis
If only the furnace power stops, but the rest of the cycle sequence continues normally, it is
not very likely that this is a problem of the software. It could be a too low main power
voltage compared to the set power.
NOTE: If the phase angle control has to give the full ( 180° ) when trying to keep the set
power, the power will completely be switched off. This is done by the power control board
without any software involvement. It is made on purpose to protect the furnace in case of
any exaggerated settings by the operator or due to software or electronic unit failures.
Also any wrong results due to power deviations on the furnace resulting from a too low
mains power voltage will be avoided.
In order to find out wether it is a software problem or a too low voltage, enter a lower
power. If the furnace power is not interrupted anymore, the voltage was too low for the
previous higher power.
For detailed explanation, see 2.16.
No water flow
see 1.10
Check the wiring
Replace ON 21
yes
Replace the electronic
drivers, see 1.15.
Check the wiring,
see 4.2.
1-13
the DC
?
Is
voltage on
TP11 0,5V
or 15V
0,5V15V
15V on TP13
of
PW13?
Are
no
Start analysis
TP9 is GND
see 2.16
Grease the furnace
closure O-ring.
Clean the electrodes.
Measure 2VDC
to 5VDC on TP14
(1VDC for each kW).
Check the power
settings.
Insulation ring
in contact with
upper furnace
part?
no
yes
electrode insert
Change upper
Change lower
electrode tip
Upper
furnace
part
ring
Insulation
Check the power settings.
See operation manual 4.8
of the cycle
running
correctly
?
the rest
Is
no
yes
No analysis start,
No current on the panel meter
No furnace power
see 1.9
Crucible
missing or
too short
Replace PW13,
see 2.16.
Check the wiring,
see 4.2.
Check all phases
to be available.
Check the big fuses
inside the analyser.
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