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1) Protect the input cable with fuses if this is demanded due to limited short-circuit withstand capability of the
supply unit and/or the input cable. For information on the current rating of the fuses, see the technical data.
￭
Connection procedure of the input power cables (D6D/D7D supply
modules)
See the system integrator manuals for connecting the input power cables to the main input
busbars/terminals of the cabinet.
Note: The instructions below are based on one example cabinet construction. They are not
applicable to all possible solutions but only clarify the principles.
WARNING!
Obey the safety instructions given in ACS880 multidrive cabinets and
modules safety instructions (3AUA0000102301 [English]). If you ignore
the safety instructions, injury or death, or damage to the equipment can
occur.
If you are not a qualified electrical professional, 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.
1. Lead the cables into the inside of the cabinet. 360° grounding of the cable shield at the
cable entry is recommended to suppress the interference.
2. Twist the cable shields to bundles and connect to cabinet PE (ground) busbar. Connect
the separate ground conductors/cables to cabinet PE (ground) busbar.
3. Connect the phase conductors to the input terminals of the main switch-disconnector
[Q1]. For tightening torques, see the technical data.
4. Connect the output terminals of the main switch-disconnector [Q1] to the main contactor
[Q2] input terminals.
5. Ground the module from the module front plate at top of the module. The grounding
point (a) is marked on the module. Connect the frame support bracket (b) on the module
front plate 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 (such as with 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 only through the mounting screws and the cabinet
chassis is not always good enough. To make sure that the continuity of the protective
bonding circuit is sufficient, 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
ACS880 multidrive cabinets and modules electrical planning instructions
(3AUA0000102324 [English]).
6. Connect the contactor [Q2] output terminals to the module input terminals or to the AC
connection busbars.
7. Connect the module DC busbars into the cabinet common DC busbars.
Electrical installation 75
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