160 ACS 400 User’s Manual
Relay Outputs
The ACS 400 has two programmable relay outputs. Relay output 1 and 2 operation is configured by
parameters 1401 RELAY OUTPUT 1 and 1402 RELAY OUTPUT 2. Value 29 (PFC) allocates the
relay output for the Pump and Fan Control block. This is the default setting for both relay outputs
when the PFC macro is selected.
Adding More I/O to ACS 400
When Pump and Fan control is used, the ACS 400 is capable of using optional I/O extension
modules (NDIO). These modules provide additional relay outputs and digital inputs. I/O
extensioning is needed
• When the standard relay outputs of the ACS 400 (RO1 and RO2) are needed for other
purposes and/or number of auxiliary motors is large, and
• When the standard digital inputs of the ACS 400 (DI1 - DI5) are needed for other purposes and/
or number of interlock signals (auxiliary motors) is large.
I/O extension modules are connected to the ACS 400 via a DDCS fiber optic link. An optional
DDCS communication module is needed to use DDCS.
There can be either one or two NDIO modules on the DDCS link. Each NDIO module contains two
digital inputs and two relay outputs.
Setting up NDIO modules
Refer to the Installation and Start-up Guide of the NDIO module for installation instructions. After
installation, the communication between the ACS 400 and NDIO modules is set up as follows:
• Set the module node numbers using the DIP switches located inside the modules. Refer to
NDIO module manual for details. Module node number must be 5 if only one NDIO module is
used. Node numbers must be 5 and 6 if two NDIO modules are used.
• Connect power to NDIO modules.
• Activate DDCS protocol by setting parameter 5005
PROTOCOL SEL to 1 (DDCS).
• Tell the ACS 400 that extended I/O is used by setting parameter 5007
DDCS BUS MODE to 2
(
EXTENDED IO). Communication between the ACS 400 and the NDIO module(s) is now
operating.
Alternation Switchgear
PFC autochange operation (set by parameters 8118 AUTOCHNG INTERV and 8119 AUTOCHNG LEVEL)
requires dedicated alternation switchgear which is controlled through the relay outputs of the
ACS 400. Contact your nearest ABB supplier for more information.
http://nicontrols.com
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