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Overview
Power Cable Selection
and Routing
Installation and Start-up Guide for NBRA-6xx
Chapter 4 – Electrical Installation
This chapter contains instructions for electrical installation.
• Power cable selection and routing (for all chopper types) are
described on this page.
• The control connections (for all chopper types) are described on
pages 4-2 to 4-4.
• The power connections are described on pages 4-5 to 4-16. The
installation instructions are given separately for each chopper.
Note: Drive Parameter 20.5 (20.7 for ACP 600) OVERVOLTAGE CTRL
must be set to OFF to enable chopper operation.
Standard screened three-conductor and single-conductor power cables
are specified in Tables 2-1 and 2-2. Two-conductor screened cables
can also be used.
Under the converter, chopper and resistor units, provide adequate
support for the cables.
The following should be considered in order to minimise electromag-
netic interference caused by the rapid current changes in the cables:
– The braking power line should be completely screened, either by
cable screen or metallic enclosure. Unscreened single-core cable
can only be used if routed inside a cabinet that efficiently suppresses
the radiated RFI emissions.
– The cables should be installed away from other cable routes.
– Long parallel runs with other cables should be avoided. The minimum
parallel cabling separation distance should be 0.3 metres.
– Cables should cross at right angles.
The maximum lengths of the chopper and resistor cables are 5 m and
10 m respectively. The longer the cables, the higher the inductive load.
High load inductance causes voltage peaks over the semiconductors of
the chopper.
5 m max.
ACS 600
10 m max.
NBRA-6xx
Resistor(s)
4-1
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