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tions can be a powerful tool for diagnosing system

problems.

The fault history and the record of run cycles

maintained in the Intelligent Store™ Discus® memory

cannot be re-set. If a compressor is replaced, the E2

notebook feature (see section 5.7 of this manual)

should be used to maintain a record of faults at the

time of replacement (if the Intelligent Store™ Discus®

front box is transferred to the new compressor). This

record will make it easier to determine which faults

belong to the new compressor, and which ones

belong to the old compressor.

1.2

Features

1.2.1 Compressor Protection

Compressor protection may be in the form of a TRIP,

where the compressor will be shut off until the fault

condition no longer exists, or a LOCKOUT. A LOCK-

OUT is a condition whereby the compressor will

remain off until the fault condition no longer exists

AND the manual reset button is pushed. Oil pressure

and discharge temperature lockouts may also be

reset remotely through UltraSite™ if this password

protected feature is enabled. Refer to sections 4.0

and 5.0 of this bulletin for more detailed information

regarding compressor operation and interpretation of

status codes.

The following compressor protection features are

provided on all Intelligent Store™ Discus® compres-

sors:

• High discharge pressure

• Low suction pressure

• Discharge temperature

• Line-break motor protection (2D/3D)

• Motor temperature protection (Intelligent

Store™ Discus® replaces the solid-state

module used on 4D compressors)

• Low voltage

• Power interrupt motor protection

• Welded contactor protection

• Loss of phase motor protection

• Low oil pressure (Intelligent Store™ Discus®

replaces the Copeland® brand Sentronic+™

oil pressure protection module)

The following options are available on Intelligent

Store™ Discus® compressors:

• Liquid injection for discharge temperature

control (Intelligent Store™ Discus® replaces

the Demand Cooling module on HCFC-22 low

temp models)

• Crank case heater

• Capacity modulation

1.2.2 Remote Reset

Oil pressure lockout and discharge temperature

lockout may be reset through the E2 or remotely

through UltraSite™. The oil pressure lockout reset

feature is password protected.

Service contractor and end user policies need to be

considered when deciding whether to enable or

disable the oil pressure remote reset feature. The

default condition is to “disable” this feature.

Refer to section 3.8 for enabling or disabling remote

reset.

1.2.3 Failsafe Operation

The “Failsafe” mode may be configured (through the

E2 during commissioning) to turn the compressor on

or off in the event of a communications failure. The

Intelligent Store™ Discus® will revert to the failsafe

setting (to either RUN or to remain OFF) when

communications are lost for 5 or more minutes.

The default setting for all Intelligent Store™ Discus®

compressors leaving the Emerson Climate

Technologies, Inc. factory is “ON”. If the rack has not

been commissioned, system charging may be accom-

plished by supplying pilot circuit power to the

Intelligent Store™ Discus® compressor with the E2

OFF. After 5 minutes the Intelligent Store™ Discus®

will send a run command to the contactors.

Compressors with power to the contactors will then

RUN with fully enabled protection features (e.g.,

suction and discharge pressure, discharge tempera-

ture, motor protection).

During the commissioning process decisions should

be made regarding which compressors should run

and which ones should not when communication has

been lost.

1.2.4 Welded Contactor Protection

Voltage is sensed at the motor terminals of the

Intelligent Store™ Discus® compressor. If voltage is

present after the contactor has been signaled to

“open”, the module will send a welded contactor alarm

to the E2. The E2 then issues a run command to the

module to load the contactor, bringing all three legs of

the power supply back on line. This prevents a single-

phase motor burn. The compressor will run continu-

ously until the unit is manually shut down. Safety

devices (pressure switches and motor protection) will

override this feature.

This is not to be confused with single-phase protec-

tion at start-up or while running. In that case, the

contactor will be instructed to “open”, shutting down

the compressor.

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