Modbus Communications; External Hardware; Current Transformers; Potential Transformers - Eaton Cutler-Hammer IQ 300 Series Instructions For Installation, Operation And Maintenance

IL17574C
Page 2-8
distribution system equipment. PowerNet is a noise-immune communication system
that permits communication between a master computer and system devices, such
as the IQ 320 and the IQ 330.
Consult TD17513 IMPACC Wiring Specification Base Rules for detailed information
on proper installation and termination of network cable.
The following functions can be performed remotely when the IQ 320 or IQ 330 is
connected to an external PowerNet compatible network:
• Display measured system, phase and min/max values
• View and edit set points
– System frequency
– Wiring configuration
– CT and PT ratios
– Demand window
– Energy tracking (KYZ pulse output)
• View energy, view and reset peak demands, and all or individual minimum and
maximum values.
• View status or count of the 2 digit inputs, reset digital outputs and read analog
input (IQ 330 ONLY).
2.3.5

MODBUS Communications

The IQ 330M Enhanced Electrical Distribution System Meter is a MODBUS
compatible device. When connected via the MODBUS port, values can be remotely
read using the addresses provided in the MODBUS table. Further capabilities can
be obtained through the use of INCOM PASSTHRU and SLAVE ACTION tech-
niques explained in chapter 5.
2.4

EXTERNAL HARDWARE

2.4.1

Current Transformers

The IQ 300 series requires at least two user-supplied external instrument class
current transformers with 5 amp secondaries. These transformers must be con-
nected to the current transformer terminals on the IQ 300 Base Module as detailed
in section 3.3.
2.4.2

Potential Transformers

The IQ 300 series requires user-supplied potential transformers if the system line
voltage is above 600 volts. These transformers must be connected to the voltage
terminals on the IQ 300 Base Module as detailed in section 3.3.
2.4.3

External Fuses

It is recommended that user-supplied fuses be installed as described below to
protect the IQ 300 and related components from damage.
Page 2-8
For more information visit:
Effective Date: 2/04
IQ 300
www.cutler-hammer.eaton.com
Effective Date: 2/04