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1. Overview of Emerson Climate

Technologies Intelligent Store™

Discus® Compressor

The Intelligent Store™ Discus® product line is now

available on 2D, 3D and 4D compressors and

integrates a number of important sensing and

compressor protection functions. This product

provides a Network Communications Interface (NCI)

for on/off control of the compressor, capacity modula-

tion and for communication of compressor status to

the Computer Process Controls™ (CPC) E2 rack

controller. Protection against low oil pressure, exces-

sive discharge temperature, high discharge pressure

and low suction pressure is standard on every

Intelligent Store™ Discus® compressor. A prominent

7-segment display on the front of the Intelligent

Store™ Discus® compressor indicates at a glance the

operational status of the compressor.

Note: Throughout this manual the term “module”

refers to the electronic control box of the Intelligent

Store™ Discus® compressor.

1.1 Functionality

1.1.1 Diagnostics

The Intelligent Store™ Discus® compressor continu-

ally displays a code indicating the compressor status.

Normal conditions such as “On”, “Off”, “Injecting

Liquid” and “Low Suction Pressure” are displayed with

a steady code. Indications of fault conditions (e.g.,

low oil pressure, high discharge pressure, etc.) are

displayed with a flashing code. The status codes in

figure 1.0 are discussed thoroughly in this manual,

along with troubleshooting charts to help diagnose

root causes.

These status codes may also be viewed directly on

the E2 controller window, remotely through

UltraSite™ or other remote monitoring software avail-

able from CPC (Computer Process Controls™).

Figure 1.0 Intelligent Store Discus Status Code Table

1.1.2 Communications

Communication between the rack controller and each

Intelligent Store™ Discus® is through an NCI485 net-

work with an RS485 electrical interface and jumper

termination. The two-wire communication cable is

daisy-chained from one compressor to the next on

each rack.

Compressor operations such as on/off control,

modulation operation, transmission of compressor

status and run proofing are all accomplished through

the communication network. Password protected

remote reset of certain compressor lockouts may also

be done through the communication network if this

functionality has been enabled in the controller.

The E2 may be configured to send alarms for

different levels of compressor faults, such as for

“lockouts” or for “trips”.

The “Failsafe” mode may be configured to turn the

compressor on or off in the event of a communica-

tions failure. This configuration is accomplished

through the E2 control panel (reference section 3.7).

1.1.3 Fault History

The most recent compressor trips and lockouts may

be observed through the E2 control panel, UltraSite™

or other remote monitoring software. A time-date

stamp on each fault enables correlation of compres-

sor faults to system events. A running tally of lockouts

and run cycles is accessible through the E2.

Graphing of compressor history (such as run cycles,

injection cycles or system conditions) and fault condi-

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Emerson E2 Manuale dell'Operatore Pagina 5

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