Maintenance - ABB QCap Installation, Inbetriebnahme Und Wartungsanleitung

− Consider the heat dissipated from all the com-
ponents and apparatus in the cubicle: reactors,
capacitors, contactors, fuses, etc.
− Consider the maximum permissible temperatures
for all the components and apparatus.
Consider how to direct the airflow with respect to the
position of the capacitors (Fig. #4).
3. The use of an overtemperature protection is recom-
mended in order to switch the bank off in case of fan
failure or overtemperature due to other cause.
4. Regular maintenance and cleaning of any filters is
necessary. Without regular cleaning the cooling system
may become inefficient.
Harmonics
Installation of capacitors on networks disturbed by har-
monics may require special precautions especially when
there is a risk of resonance phenomena.
QCap group assembly
Directly interconnecting several QCap unit is not allowed.
To increase the power of one step, the QCap units must
be put in parallel and connected directly to the contactor
or to the reactor.
QCap fixation
Fix each QCap unit through its M12 threaded mounting
stud at the bottom of the capacitor.
For proper ventilation separate the QCap unit by 30
mm/1.18 inches from each other.
Make sure that the rigidity of the support and the screws
are sufficient to bear the weight of the QCap capacitor
unit(s).
Washer must be used to allow for the ground continuity
and for the temperature variations.
Electrical connection
Cables must be long and flexible enough in order to allow
the cover to expand in case the overpressure safety
device must operate.
Cables should be rated at minimum 1.5 times the nomi-
nal capacitor current.
The cables must be flexible, and their size should not
exceed 16 mm²/0.025 in² (AWG5).
Depending on the size of cable used, the lugs of correct
size should be fitted on the cable before making the
electrical connection. Non-isolated cable lugs are recom-
mended. In case isolated cable lugs are used, the active
part length of the lugs should be comprised between
20-25 mm/0.79-0.98 in.
The lug must be properly fixed using the correct tool. The
cable with lug mounted on it should be inserted in the
cage type terminals of the QCap. While tightening the
screw, a torque of 2Nm/17.7in.lbs. should be applied for
proper electrical connection, without damaging the cable.
Before inserting the wires inside the QCap terminals,
make sure the terminal screws are completely loosened
(screwdriver tip: we recommend the PH2 special for elec-
tricians.) Care should be taken to avoid the strands from
going apart while inserting the cable in the QCap
terminals.
Ensure that all connections are tight. Torque must be
2Nm/17.7in.lbs.
Commissioning
With the equipment isolated from the supply, check:
− Cabling is properly connected;
− Ambient ventilation is adequate;
− Correct tightness of the connections.

Maintenance

1. Ensure safety procedures are completed (see para-
graph "Safety")
2. Annual maintenance should include:
− Removal of dust deposits, cleaning of all parts;
− Check of tightness of all electrical connections;
− Check of ambient temperature;
− Check the enclosure is not damaged.
It is recommended to replace the QCap capacitors after
15 years from the manufacturing date. This is considering
that the disconnecting system may not work properly
after this duration due to ageing of plastic material used
in it.
Recycling
Defective units are inert and present no environmental
hazard. They can be destroyed in class II channels.
Besides, some internal parts may present a danger for
people safety when dismantled. It is therefore recommen-
ded not to open the units for eventual recycling.
While every care is taken to ensure that the information contained
in this publication is correct, no legal responsibility can be accep-
ted for any inaccuracy. We do not accept responsibility for any
misuse of the product. The company reserves the right to alter or
modify the information contained herein at any time in the light of
technical or other developments.
ABB QCap manual | English 3
en