Measurement Of Resistance Across Closed Contacts Of Poles; Replacement Due To System Malfunctions; Spare Parts And Accessories - ABB DS1 Installation And User Manual

The indications provided by the pressure sensor are:
Pressure OK
Pressure OK switch is closed: the operating pressure is higher
than 3.1 Bar relative (44.961 PSI)
Pressure Warning
Pressure Warning switch is closed and Pressure OK switch is
open: the pressure of the system is below 3.1 Bar relative.
The system is still operative in this condition. Refilling and in-
spection should be planned
Pressure Alarm
Red Lamp on: the pressure of the system is below 2.7 BAR
relative (39.160 PSI). Operation is inhibited and the system is
self-interlocked.
At this stage the interlock circuit of the DS1 control is opened.
All operations are inhibited with the exception of the upstream
CB breaker open condition (see commissioning and mainte-
nance instructions).
8.6 Measurement of resistance across
closed contacts of poles
Set the three poles in the Closed position. Refer to the "Com-
missioning - Test with no power, no sync" section to close DS1
Using a µohm-meter, measure the resistance of each pole
by connecting the instruments between the input and output
flanges.
The resistance readout must be: R ≤ 47 µΩ for new apparatus
For an already installed apparatus that has performed 5,000
operations or more, the resistance could increase up to
100 µΩ.
If the value measured is higher than the limit, it means that
there are faults inside the poles.
Maintenance operations
Maintenance must only be carried out by ABB personnel.
Replacement of any parts included in the "List of spare parts/
accessories" must only be carried out by ABB personnel.
8.7 Replacement due to System malfunc-
tions
Contact the ABB personnel for assistance if the system func-
tions in a faulty way.
The apparatus must be sent to the manufacturer's factory if the
following parts must be replaced:
− Complete pole with bushings/connections
− Motors.
Electronic devices, capacitor and cabling can only be replaced
on site by ABB specialized field service technicians.

8.8 Spare parts and accessories

Assembly of spare parts/accessories regard-
ing the installation, putting into service, ser-
vicing and maintenance must only be carried
out by ABB personnel or trained personnel
familiar with DS1 characteristics and Integra-
tion features.
Before performing any operation, check that the apparatus is
open and that there is no voltage (medium voltage circuit and
auxiliary circuits).
Installation of spare parts is part of field service. Replacement
of parts due to system malfunctions must be performed by
ABB service operators (at least Level 3).
If DS1 reports a fault, identify the type of fault as described in
fig. 12 and contact ABB.
To order accessories or spare parts, please refer to the com-
mercial ordering codes given in the technical catalogue and
always indicate:
− Apparatus type
− Rated voltage of apparatus
− Rated thermal current of apparatus
− Serial number of apparatus
Please contact our Service department if field service or spare
parts are required.
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