ABB ACH 400, User Manual

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ACS/ACH 400 Direct N2 Bus Interface 3-1
Chapter 3 – Installation
This chapter describes the installation of the N2
network for the ACS/ACH 400 Drives using the
RS-485 connection. It describes the planning of
the network installation, required hardware
wiring, and programming considerations for the
drive.
Introduction
The N2 Bus connection to the ACS/ACH 400
drives is based on an industry standard RS-485
physical interface. This chapter will not deal
with Johnson Controls N2 Bus performance or
feature capabilities, but will simply show how
the drives need to be physically wired to the
network.
Network planning should include the following
topics:
• Define the types and quantities of the
devices which will be connected to the
network.
• Define what control information will be
sent down to the drives.
• Define what feedback information will be
sent from the drives to the controlling
system.
During the planning phase, ensure that all NEC
and local code restrictions are followed.
Controlling the drive
The drive can receive control through the N2
Bus connection by having the Metasys send
Analog and/or Digital output point values down
to the drive. The control location places must be
setup for COMM for the control information
which needs to be received from the Metasys.
Control actions which are available are
described in detail in Chapter 4 – Programming
of this manual.