MAN. PS 254 EN – Ind. 2 55
4. SERVICING, MAINTENANCE AND TROUBLESHOOTING
4.1. Servicing
4.1.1. Adjustments
! General
The expression calibration is defined by
regulating standards and is used when the
generator has to meet special requirements,
for example Quality Assurance or ISO 9000
quality system. Calibration needs specific
testing equipment and procedures: we can
perform it on special request, in your company
or in our workshop.
Following informations concern routine
adjustment that you can perform, outside these
cases, as frequently as you think it advisable,
for example as it is said further.
! Necessary equipment
To be able to make adjustments, it is
recommanded to have at your disposal:
• A voltmeter.
• A shunt or any other means of measuring
continuous current of a current at least
equal to 200 A and of the class 0.2.
• A TIG (GTAW) welding torch of a sufficient
capacity.
• A resistance of 2 Ω/200 W.
! When to adjust?
A drift may occur with time ; it results from
ageing of components. So we recommend you
to check power source adjustments on an
average of one year.
! Exchange of cards or the inverter unit
The 21700633 sequencer card and the
21700634 synoptic card are pre-adjusted in
the factory. In case of a standard exchange of
these cards, no further adjustments are
necessary. However, further adjustments are
necessary in case of replacement of the
21700690 card or the source.
! How to adjust?
Before carrying out a regulation check, leave
the generator switched on for approximately 15
minutes. This will allow the generator to reach
its normal working temperature. If this is not
done, the adjustments that you make will be
altered because of the rise in temperature
during a normal cycle. To access the cards,
remove the front panel of the generator. It will
also be necessary to bypass the short circuit
security of the inverter unit. To do this, put the
switch S3/2 of the 21700633 card and the
switch S1/4 of the 21700634 synoptic card to
the CLOSED position.
Warning After the adjustments have
been made put the switches
to the "OPEN" position,
otherwise the short circuit
security system of the
generator will not work
properly.
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