ABB NBRA-6 Series Installation And Startup Manual page 27

Mounting Instructions
for NBRA-657/667
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 plate.
• Remove the protective plate covering the opening to the cooling
channel. The same screws are to be used for chopper mounting.
• Remove the screws from the UDC+ and UDC– busses of the
chopper. The same screws are to be used for connecting the busses
to the intermediate circuit of the ACS 600.
• Place the chopper onto the assembly plate by inserting the cooling
element into the cooling channel. Pull the chopper upwards to fit the
edge of the assembly plate opening to the slot on the upper side of
the chopper. The chopper is placed correctly when:
– the upper part of the chopper is locked by the edge of the
assembly plate
– the two mounting holes in lower part of the chopper are aligned
with the screw holes in the assembly plate
– the UDC+ and UDC– busses of the ACS 600 match the
corresponding terminals of the chopper.
• Insert the screws through the mounting holes in the UDC+ bus and
the UDC– bus. Turn each screw to ensure the correct positioning of
the chopper.
• Tighten the chopper mounting screws to 10 Nm.
• Tighten the UDC+ and UDC– bus screws to 6 Nm.
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