ABB NBRA-6 Series Installation And Startup Manual page 25

Mounting
Instructions for
NBRA-655/656/666
Installation and Start-up Guide for NBRA-6xx
Chapter 3 – Voltage Selection and Mechanical Installation
WARNING! Before starting the installation work inside the ACS 600:
Switch off the ACS 600 power supply. Wait for five minutes to ensure
that the intermediate circuit is discharged. Switch off dangerous
voltages connected from external circuits to the digital inputs and to the
relay outputs of the ACS 600.
WARNING! Do not touch the printed circuit boards. The integrated
circuits are extremely sensitive to electrostatic discharge.
• Ensure that the chopper voltage level is set correctly (see page 3-1).
• Remove the frequency converter front cover.
• Remove the protective plate covering the opening to the cooling
channel. (Two of these screws will be used for chopper mounting.)
• Remove the screw from the PE terminal of the ACS 600. (This
screw will be used for chopper PE connection.)
• Place the chopper onto the assembly plate by inserting the cooling
element into the cooling channel. Pull the chopper downwards to fit
the edge of the opening to the slot on the side of the chopper. The
chopper is placed correctly when:
– the lower part of the chopper is locked by the edge of the
assembly plate
– the two mounting holes in the upper part of the chopper are
aligned with the screw holes in the assembly plate
– the UDC+, UDC– and PE busses of the ACS 600 match the
corresponding terminals of the chopper.
• Insert the two screws removed from the ACS 600 assembly plate
into the two chopper mounting holes. Fasten the screw removed
from the ACS 600 PE terminal to the PE bus. Insert the screws
supplied with the NBRA-6XX into the UDC+ and UDC– busses. Turn
each screw to ensure the correct positioning of the chopper.
• Tighten the mounting screws to 4 Nm.
• Tighten the screws on the UDC+ and UDC– busses to 6 Nm.
• Tighten the screw on the PE bus to 6 Nm.
WARNING: If you remove the braking chopper from the ACS 600, also
remove the screws from the UDC+ and UDC– busses. Screws left in
the busses may cause a short circuit in the intermediate circuit.
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