Installation and Start-up Guide for NPBA-01
4-1
Chapter 4 – Electrical Installation
Overview
This chapter contains:
•
Cabling instructions
•
Instructions for bus termination
•
Connection and earthing instructions for the NPBA-01 module and
earthing instructions for the bus cable.
WARNING! Before installation, switch off the ACS 600 power supply.
Wait for five minutes to ensure that the intermediate circuit is
discharged. Switch off all dangerous voltages connected from external
control circuits to the digital inputs or relay outputs of the ACS 600.
Cabling
Arrange the bus cables as far away from the motor cables as possible.
Avoid parallel runs. Use bushings at cable entries.
Handle the fibre optic cables with care. The maximum long term tensile
load is 1 N and the minimum short term bend radius is 25 mm. Do not
touch the ends of the fibres with bare hands as the fibre is extremely
sensitive to dirt.
Bus Termination
The built-in terminating resistors must be switched on if the NPBA-01
module is installed at the end of the bus. Otherwise the resistors must
be switched off. Terminating resistors prevent signal reflections from
the bus cable ends.
Figure 4-1 Terminating resistors on (left) and off (right).
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