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64 Electrical installation
￭
Connection procedure for power connections inside the DC/DC
converter cubicle
WARNING!
Obey the safety instructions given in Safety instructions for ACS880
liquid-cooled multidrive cabinets and modules (3AXD50000048633
[English]). If you ignore the safety instructions, injury or death, or damage
to the equipment can occur.
If you are not a qualified electrician, do not do installation or maintenance
work.
WARNING!
Apply grease to stripped aluminum conductors before attaching them to non-coated
aluminum cable lugs. Obey the grease manufacturer's instructions.
Aluminum-aluminum contact can cause oxidation in the contact surfaces.
Make sure that the converter and filter modules, and other components of the DC/DC
converter unit has been installed in a cabinet, in other words, the mechanical installation of
the unit has been done.
1. Stop the drive and do the steps in section
you start the work.
2. Open the door of the DC/DC converter cubicle and remove the shrouding (if any).
3. Make the connections in between the main circuit components inside the cabinet if not
done yet. Do the connections according to the final circuit diagrams for the drive. If the
connections are ready, check them against the final circuit diagrams. Do not use the
example circuit diagrams in this manual as the sole source of information when doing
or checking the connections.
For the tightening torques, see the technical data.
4. Ground the modules by the top edge of the front plate. The grounding point is marked
on the module (a). Connect the front plate to the frame support bracket (b) with screws.
The frame support bracket should have a galvanic connection to the PE busbar through
the cabinet frame.
Note:
If the cabinet frame is painted (for example, Rittal VX25 enclosures), it is important to
make sure that a good galvanic connection to ground (PE busbar) is achieved. You
can, for example, remove the paint from the connection points and use star washers.
Note:
The connection to ground merely through the mounting screws and the cabinet chassis
is not always good enough. To ensure the continuity of the protective bonding circuit,
you can connect the modules to the cabinet PE busbar with a copper busbar or cable.
The inductance and impedance of the PE conductor must be rated according to
permissible touch voltage appearing under fault conditions (so that the fault point voltage
will not rise excessively when a ground fault occurs). See Electrical planning instructions
for ACS880 multidrive cabinets and modules (3AXD50000048634 [English]).
Electrical safety precautions (page 60)
before
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