ABB NBRA-6 Series Installation And Startup Manual page 23

Mounting Instructions
for NBRA-654/664
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 4 chopper mounting screws from the assembly plate of
the ACS 600.
• Loosen the screws (9 pcs.) which fasten the gland plate of the
ACS 600 to the frame. The screws can be removed if there is
otherwise not enough space to install the chopper.
• Place the chopper onto the assembly plate and at the same time
insert the UDC+ and UDC– busses into the corresponding terminals
of the ACS 600.
• Tighten the mounting screws through the chopper mounting holes to
3 Nm.
• Tighten the UDC+ and UDC– terminals of the ACS 600 to 2 Nm.
• Tighten the mounting screws (9 pcs.) of the ACS 600 gland plate to
2 Nm.
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