132 Electrical installation
Connection procedure of the supply cables
WARNING! Repeat the steps described in section Electrical safety
precautions on page 128. The complete safety instructions are given in
Safety instructions for ACS880 multidrive cabinets and modules
(3AUA0000102301 [English]). If you ignore them, physical injury or death, or damage to
the equipment can occur.
WARNING! With aluminum cables, apply grease to stripped 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
lead-through is recommended to suppress interference.
2. Twist the cable shields to bundles and connect to the cabinet PE (ground) busbar.
Connect the separate ground conductors/cables to the cabinet PE (ground) busbar.
3. Connect the phase conductors to the input terminals of the main switch-disconnector
[Q1.1] / main circuit breaker [Q1]. For tightening torques, see Cabinet design and
construction instructions for ACS880 air-cooled and liquid-cooled multidrive modules
(3AUA0000107668 [English]).
4. Connect the output terminals of the main switch-disconnector [Q1.1] / main circuit
breaker [Q1] to the main fuses [F1.x].
5. Connect the main fuses [F1.x] to the main contactor [Q1.2] input terminals.
6. Connect the contactor [Q1.2] output terminals to the AC busbars leading to the supply
module.
7. Inside the DSU cabinet, push the supply module into the quick connectors.
8. Ground the module:
• Ground the module from the module front plate at top of the module. The
grounding point is marked on the module. Connect the front plate to the frame
support bracket with screws. The frame support bracket should have galvanic
connection to the PE busbar through the cabinet frame.
Note: If the cabinet frame is painted (for example, Rittal TS 8 cabinets), it is important
to make sure that 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: Connection to ground through fixing 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/cable (grounding wire) 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 (3AUA0000102324
[English]).
9. Connect the DC busbars of the supply module into the cabinet common DC busbars.
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